Section 184 of 440

Complete canonical tutorial. This reader section contains the same teaching body as PWR-001 · Maximal force production. Open the Power dossier.

PWR-001 · SUPERVISED full tutorial

Perform a clean maximal isometric knee-extension test on a fixed dynamometer

This tutorial teaches the actual technique used during a provider-controlled maximal isometric knee-extension test. You will learn how to sit and align the knee, remain completely relaxed while the device is zeroed, recognise the ready, build, hold and stop cues, build force without kicking or jerking, keep breathing, release immediately, and decide whether a force-time trace is valid. The number counts only when the declared setup and technique remained unchanged. This is not permission to improvise a maximum, choose your own test dose or turn the result into a lifting recommendation.

What you will produceDuring an authorised dynamometer appointment, the learner can set up with provider assistance, follow the complete ready-build-hold-stop sequence, produce a smooth maximal isometric right-knee extension without body movement or breath-holding, recover safely and explain why the best valid peak is used instead of the largest screen number.

Method12 numbered Power-specific steps

Practice authorityFull method with qualified supervision where stated

Start step by step Open research dossier

1 · Permission and limits

Know exactly what you may do

You may

Tell the provider about symptoms, recent health changes and previous reactions to hard exertion; repeat the declared side, movement, joint angle and stop signal before testing.
Follow the provider's positioning instructions, remain relaxed for device zeroing, complete the authorised familiarisation pushes and perform the taught ready-build-hold-stop sequence only when cued.
Report pain, dizziness, unusual breathlessness, headache, altered sensation, cramp or loss of position immediately, and inspect the recorded force-time trace with the provider after recovery.

Qualified help is required for

Decide whether a maximal isometric effort is appropriate after reviewing cardiovascular, neurological, musculoskeletal and other relevant risks.
Select and calibrate the dynamometer; choose the tested side, knee angle, pad position, restraints, warm-up, cue timing, rest, number of attempts, validity tolerance and retest date.
Guard transfers, align the knee and machine axis, monitor symptoms and breathing, stop an unsafe trial, classify every trace and decide whether another maximal attempt is authorised.

Never do this from the page alone

Do not reproduce this test with an immovable household object, luggage scale, gym machine, strap, bathroom scale or another improvised resistance.
Do not add a bonus maximal push, change the knee angle, move the shin pad or ask another person to hold the limb because a score feels disappointing.
Do not use the result as a one-repetition maximum, safe lifting limit, diagnosis, return-to-work clearance or proof that another movement is safe.

2 · Get ready

Gather what you need and check the starting conditions

What you need

A calibrated fixed dynamometer suitable for isometric knee-extension testing
An adjustable testing chair with back support, pelvic and thigh restraints, and a provider-controlled shin pad
A visible or spoken cue sequence for ready, build, hold and stop
A timer controlled by the provider for familiarisation, effort and recovery periods
A session record with fields for device identifier, tested side, knee angle, seat position, pad position, restraint settings, raw force-time trace, validity code, symptoms and accepted peak
A separate form for one relevant functional observation, such as five-chair-rise time, when the provider has selected one

Before you start

Tell the provider about chest symptoms, fainting, severe or unusual headache, uncontrolled blood pressure, recent surgery or injury, current pain, swelling, joint instability, new weakness or numbness, pregnancy, medication changes and any previous bad response to maximal exertion.
Confirm that today's declared task is isometric knee extension: the lower leg pushes forward into a pad that does not move. It is not a leg press, squat, kick, leg-extension repetition or lifting exercise.
Ask the provider to show the emergency release and agree on both a spoken stop word and a non-verbal stop signal.
Read back the tested side, knee angle, machine identifier and pad position. These details form part of the result; a score without them cannot be reproduced.
Practise the four cues with no force: ready means become still and relaxed, build means increase pressure smoothly, hold means keep giving the strongest controlled effort without changing posture, and stop means release immediately.
Begin only after the provider has approved the health screen, device check, body position and communication method.

3 · The method

Follow these steps in order

Name the exact test
Say aloud which leg is being tested and what it must do. A complete description is: right knee extension, seated, knee fixed at the recorded angle, pushing the shin forward into this stationary dynamometer pad.
Why: Maximal force changes with the joint angle, side, body position and device. Naming the task prevents an accidental substitution.
Check: Learner and provider independently give the same side, movement, position and device description.
Sit fully back in the chair
Move the hips to the back of the seat. Place the trunk against the back support, keep the pelvis level and put the hands in the provider-named position. Let the untested foot rest where the provider places it.
Why: Sliding forward, arching or pulling with the arms lets other parts of the body add force to the display.
Check: The back and pelvis remain in contact with the supports while the learner makes a very light practice push.
Align the knee and lever
Let the provider line up the side of the knee with the dynamometer's turning axis, set the declared knee angle and place the pad on the recorded part of the lower shin. Say immediately if the pad pinches, presses on an injured area or causes numbness.
Why: Poor alignment changes the lever distance, can make the number misleading and may create avoidable joint or skin pressure.
Check: The provider records the knee angle, seat code and pad position, and the learner can tolerate a light contact check without pain or slipping.
Accept the supports without fighting them
Allow the provider to fasten the approved pelvic and thigh supports so the body cannot slide, while confirming that breathing and circulation remain comfortable. Do not tighten, loosen or reposition a strap during a trial.
Why: The supports keep the measured action at the knee, but a painful, restrictive or altered support invalidates the setup.
Check: The learner can breathe normally, the skin is comfortable and a gentle push produces no visible seat or strap movement.
Give the device a quiet baseline
Let the tested leg become heavy against the pad without pushing. Relax the jaw, shoulders, hands and thigh until the provider confirms a quiet zero-force baseline. If the screen shows force before the cue, relax again rather than asking for it to be subtracted later.
Why: Preloading hides the true start of the contraction and can inflate the apparent peak.
Check: The force-time line is stable at the provider's accepted zero before the ready cue.
Rehearse the four cues
On ready, stay still and breathe. On build, begin increasing pressure. On hold, maintain the strongest controlled push while the pad remains motionless. On stop, release all pressure at once and remain seated. Rehearse this once without a hard effort.
Why: Knowing the sequence prevents an early start, sudden kick or delayed release during the scored attempt.
Check: The no-load rehearsal contains a relaxed start, correctly timed build and immediate release.
Complete the graded familiarisation pushes
Perform only the provider-selected light and moderate practice pushes. For each one, build gradually, keep the body still, stop on cue and relax fully during the timed recovery. Treat these as technique practice, not chances to obtain a maximum.
Why: Familiarisation lets the learner feel the pad and signals before a hard effort without hiding extra maximal exposure in the warm-up.
Check: Every practice trace begins at zero, rises smoothly and returns to zero without pain, body movement or an unintended maximal push.
Reset before the scored effort
During the full provider-timed rest, let the thigh soften and check that the back, pelvis, hands, foot and pad still match the recorded setup. Tell the provider how the knee and whole body feel before agreeing to continue.
Why: Fatigue, symptoms or a small position change can make the next trace unsafe or incomparable.
Check: Symptoms remain acceptable, the configuration key is unchanged and the device again shows a quiet zero-force baseline.
Build the maximal push smoothly
Wait for build. Press the shin forward into the stationary pad and build force smoothly over about two seconds—like turning up a control, not kicking a door. Keep the back and pelvis against the supports, keep the hands quiet and continue breathing instead of closing the throat.
Why: A controlled rise measures voluntary knee-extension force. A kick, hip lift, arm pull or breath-holding changes the task and can produce an unsafe or false spike.
Check: The trace has a continuous rising slope, with no pre-cue force, impact spike, seat movement or breath-hold warning.
Hold until the provider says stop
At the top of the effort, keep pressing as strongly and steadily as you can while the pad stays fixed. Do not pump the leg, bounce, twist or search for a better angle. Listen for the stop cue rather than watching the number.
Why: A brief clean peak or plateau is easier to interpret than a moving, pulsing or posture-changing effort.
Check: The highest part of the trace occurs while the declared angle and body position remain unchanged.
Release immediately and recover
Release immediately on the stop cue. Let the leg become completely heavy, remain seated and breathe normally. Report what you felt before moving, unfastening supports or asking for another attempt.
Why: An immediate release shows the end of the test clearly and gives the provider a chance to detect symptoms before the learner stands.
Check: Force returns promptly to baseline and no concerning symptom, delayed pressure or extra push appears after the stop cue.
Validate before choosing a result
With the provider, inspect baseline, onset, smooth rise, peak or plateau, release and any movement or equipment flags. Label the trace valid or rejected before comparing numbers. Complete another maximum only if the provider authorises it after full rest. Report the best valid peak, not the largest screen number.
Why: A large number created by preload, a kick, hip lift, device clipping or changed setup is not maximal knee-extension force for the declared test.
Check: Every attempt remains visible with a validity reason, and the accepted result comes only from a clean trace obtained in the unchanged setup.

4 · Worked example

See the whole method used once

Scenario

Maya attends a supervised laboratory appointment. The provider declares a right-knee isometric extension test at 60 degrees of knee flexion on dynamometer D4. The shin-pad and seat positions are recorded before any hard effort.

Walkthrough

Maya repeats the task in her own words: she will sit fully supported and push her right shin forward into a pad that will not move.
The provider aligns her knee with the machine axis, sets the pad on the recorded lower-shin position and secures the pelvic and thigh supports. Maya confirms that she can breathe normally and feels no pinching or numbness.
With Maya completely relaxed, the display settles on a quiet zero-force baseline. She rehearses ready, build, hold and stop without making a hard push.
She completes two provider-selected familiarisation efforts. Both rise smoothly and return to zero, so the provider permits the first scored attempt after the full rest.
On Trial 1, Maya waits for build, increases pressure over about two seconds, keeps her back and pelvis against the supports, breathes throughout and releases on stop. The clean peak is 386 N.
On Trial 2, the display reaches 412 N, but the video and seat marker show that Maya lifted one side of her pelvis. The provider labels the raw trace rejected. The number remains in the record but cannot become the result.
After another authorised recovery and setup check, Trial 3 reaches 399 N with a quiet baseline, smooth rise, still pelvis and immediate release.
The two valid peaks, 386 N and 399 N, are 13 N apart. Their difference is about 3.3% of their average, which falls inside the provider's predeclared 5% agreement rule.
The accepted session peak is therefore 399 N. The rejected 412 N is not restored merely because it is larger.
The final result reads: right isometric knee extension, 60 degrees, dynamometer D4, recorded seat and pad settings, best valid peak 399 N, valid-trial difference 3.3%.
A separately authorised five-chair-rise check takes 12.8 seconds. That functional result stays separate from the dynamometer force and is not converted into newtons.
Maya leaves knowing the exact execution sequence and why the highest visible number was not automatically the correct answer.

Result

Maya produced a reproducible 399 N maximal isometric right-knee-extension result in one declared configuration. The result describes that test only; it does not provide a safe lifting load, diagnose a condition or prove transfer to standing, stairs, sport or work.

5 · Right and wrong

Compare correct or safer execution with the common wrong version

Right and wrong comparison
Moment	Right / safer	Wrong / riskier	Why it matters
Waiting at the start	Make the leg heavy and give the device a quiet zero-force baseline.	Lean into the pad before ready and ask the provider to subtract the preload later.	A preloaded start hides contraction onset and changes the measured effort.
Beginning the hard effort	Build pressure progressively over about two seconds after the build cue.	Kick the pad as hard and fast as possible to create a tall spike.	An impact spike can reflect momentum and body movement rather than controlled isometric force.
Using the chair supports	Keep the back and pelvis touching the recorded supports.	Arch, twist, lift a hip or pull against the chair to add force.	Those actions recruit other body segments and alter the declared knee-extension test.
Breathing	Keep air moving and use the agreed stop signal if breathing becomes difficult.	Close the throat and hold the breath until the number appears.	Deliberate breath-holding increases strain and can conceal an important symptom.
Ending the effort	Release immediately on the stop cue and remain seated for the symptom check.	Keep squeezing for an extra peak after stop or stand up immediately.	An extra push exceeds the authorised exposure, and standing too soon can miss post-effort symptoms.
Selecting the reported peak	Use the best valid peak after trace and posture review.	Choose the largest screen number even when the pelvis moved or the trace clipped.	Magnitude cannot rescue an attempt that did not follow the declared method.
Comparing another visit	Compare only the same dynamometer, knee angle and pad position, with the same cue and validity rules.	Call a different machine, angle or pad placement an improvement in the same test.	Configuration changes alter leverage and measurement conditions.
Interpreting transfer	Keep the functional result separate and test it directly.	Treat 399 N as proof that Maya can safely lift, climb stairs or return to work.	A fixed seated knee test does not measure those whole tasks.

6 · Common mistakes

Spot the error and apply the correction

Common mistakes and corrections
Mistake	Fix
The learner begins pushing during ready.	Return completely to zero, rehearse ready as a relaxation cue and restart only when the baseline is quiet.
The effort starts with a kick.	Practise a light two-second ramp and use the image of steadily turning up a control before another authorised maximum.
The pelvis slides or lifts near the peak.	Reject the trace, inspect seat fit and supports, and let the provider decide whether another trial is appropriate.
The learner watches the display and keeps pressing past stop.	Move the display out of the learner's focus and make the provider's stop cue the only end signal.
Only the largest number is written down.	Retain every raw trace, setup key, symptom note and validity decision before selecting the best valid peak.
Familiarisation efforts are mixed with maximal attempts.	Label practice and scored traces before testing begins, and never relabel a warm-up as a maximum.
The pad or knee angle changes between trials.	Pause, restore and record the original configuration; do not compare the changed attempt as though it were identical.
A newton value is reported as knee torque without a measured lever distance.	Keep the result in newtons unless the provider has recorded the moment arm and the device validly calculates N·m.
A functional task is blended into a strength score.	Put chair-rise seconds or another functional observation in a separate result field with its own interpretation.
The learner repeats a maximum independently between appointments.	Use only the provider's scheduled retest. Practising the method does not grant authority to reproduce maximal exposure.

7 · Practice

Turn the steps into a usable skill

First session

Complete the provider's health screen and agree on spoken and non-verbal stop signals.
Read back the tested side, knee action, knee angle, dynamometer, seat setting and shin-pad position.
Practise sitting fully back with the hands quiet and the untested foot in its declared position.
Rehearse ready, build, hold and stop once without force.
Produce a quiet zero-force baseline and identify preload on a sample force-time trace.
Complete only the provider-selected light and moderate familiarisation ramps with full relaxation between them.
Perform the authorised maximal attempts using a smooth two-second build, still body, normal breathing and immediate release.
After each attempt, report symptoms before inspecting the number.
Classify each raw trace as valid or rejected from its baseline, rise, peak, posture and release evidence.
Write one configuration-keyed result sentence and keep any functional observation on a separate line.

Repeat plan

Repeat session: another same-day maximal attempt occurs only when the provider has predeclared it, the full timed recovery is complete, symptoms are acceptable and every setup field still matches. Delayed retest: use a new provider-approved appointment after recovery, reproducing the same dynamometer, tested side, knee angle, seat, pad, restraints, instructions, cue timing and validity rule. Record sleep, illness, pain and recent hard activity because they can affect comparison. Do not rehearse maximal pushes independently between appointments.

Progress when

The learner can produce a quiet baseline, wait for the cue and build force without kicking.
The trunk and pelvis remain supported and the knee angle and shin-pad position do not change.
Breathing continues, release occurs immediately and recovery is symptom-free.
At least two authorised valid traces satisfy the provider's predeclared agreement rule.
A delayed retest reproduces the full configuration and any change exceeds the known error of that test.
The learner can explain the difference between peak knee-extension force and the separately measured functional task.

Do not progress when

Hold testing when there is chest pain, faintness, severe headache, dizziness, unusual breathlessness, new neurological change or sharp or increasing knee pain.
Hold interpretation when baseline preload, impact, hip lift, strap movement, altered knee angle, pad movement or device clipping affects the trace.
Hold comparison when the machine, side, angle, seat, pad, restraint, instruction or validity rule differs from the earlier appointment.
Hold additional maximal attempts when the declared trial count is complete, recovery is incomplete or the learner merely wants a higher number.
Hold progression when force changes but symptoms or the separately measured functional result have worsened.
Refer the decision back to the responsible clinician or testing professional whenever health status or suitability has changed.

8 · Check the result

Measure what changed

Best valid peak isometric knee-extension force in newtons for one fully declared side, angle, device and body configuration

How: Retain the complete force-time trace for every authorised attempt. Before comparing numbers, check for a quiet zero-force baseline, correct cue timing, a smooth rise, a clean peak or plateau, unchanged body position, no device clipping and immediate release. Record force in newtons. Report N·m only when the moment arm has been measured and the provider's device validly calculates torque. If body-mass-normalised force is also reported, show N/kg as a separate derived value rather than replacing the raw peak. Compare visits only under the same dynamometer, knee angle and pad position and only against the provider's known measurement error.

Good result: The best valid peak comes from a smooth, symptom-free trace in the declared configuration; another authorised valid trace agrees within the predeclared tolerance; and a delayed retest reproduces the setup closely enough for change to be interpreted. The functional result stays separate.

This does not prove: A clean maximal isometric knee-extension result does not establish a one-repetition maximum, whole-body strength, safe manual-handling load, diagnosis, injury immunity, occupational readiness or transfer to standing, walking, stairs or sport.

Self-check

Can you state the tested side, isometric knee-extension action, recorded knee angle and dynamometer identifier?
Can you show the provider what ready, build, hold and stop mean before resistance is applied?
Can you become fully relaxed enough to create a quiet zero-force baseline?
Can you explain why the force should rise smoothly rather than begin with a kick?
Can you keep the back and pelvis against the supports while continuing to breathe?
Can you release immediately on stop without adding a final squeeze?
Can you identify preload, an impact spike, a clean peak and a complete release on a force-time trace?
Can you explain why a 412 N hip-lift trial is rejected while a clean 399 N trial is accepted?
Can you name every setup detail needed before comparing a delayed retest?
Can you state why the result is not a lifting limit, diagnosis or proof of functional ability?

9 · Stop, adapt or get help

Keep the safety boundary practical

Stop and get help

Stop immediately for chest pain, faintness, severe or unusual headache, dizziness, unusual breathlessness, visual disturbance, new weakness, numbness or another neurological change.
Stop the current push for sharp or increasing pain, a pop, cramp, joint giving way, loss of position, inability to breathe normally, moving equipment or failure of the agreed stop signal.
Remain seated and ask the responsible provider to assess unexpected symptoms after release; do not stand, repeat the effort or drive until the provider says it is appropriate.
Cancel the session and seek appropriate clinical review when there is a meaningful new health change, unexplained loss of force, swelling, altered sensation or an adverse response that was not present at screening.

Accessibility and adaptations

Provide the ready-build-hold-stop sequence as large print, pictures, spoken cues, tactile cues or a combination chosen with the learner.
Agree on a reliable non-verbal stop signal and place a support person or interpreter where communication remains visible without obstructing the provider.
Use transfer assistance, pressure-relieving pads and individually fitted supports as needed; record every adaptation because it forms part of the test configuration.
For a learner who cannot maintain the standard hand or foot position, use a provider-approved alternative and compare only with future tests using the same recorded adaptation.
Offer a plain-language result statement and an annotated force-time trace showing baseline, build, peak and release rather than relying on a single number.

10 · Evidence and limits

Why these instructions are here

primary research
Maximal-force gains are measurable but are specific to the trained and tested task.
High-intensity strength training in nonagenarians. Effects on skeletal muscle
primary research
Different repetition zones produce different muscular adaptations, so one test result cannot stand for every form of strength.
Muscular adaptations in response to three different resistance-training regimens: specificity of repetition maximum training zones

Limits

This tutorial teaches participation in a qualified-provider test; it does not authorise self-testing or prescribe maximal-strength training.
The result belongs only to the recorded side, isometric action, knee angle, dynamometer, seat, pad, restraints, cues and validity rules.
A higher peak can reflect familiarisation or normal measurement variation unless it exceeds the test's known error under a reproduced setup.
Pain tolerance, tissue health, movement quality and real-world function cannot be inferred from the force number alone.
No universal peak-force value defines safety, health, independence, athletic readiness or suitability for work.

Open the complete canonical research register

Primary empirical supportLimiting / contrary
High-intensity strength training in nonagenarians. Effects on skeletal muscle
Maria A. Fiatarone; Evelyn C. Marks; Nancy D. Ryan; C. N. Meredith; Lewis A. Lipsitz; William J. Evans · 1990 · Primary research
Primary empirical supportLimiting / contrary
Muscular adaptations in response to three different resistance-training regimens: specificity of repetition maximum training zones
Gerson E. R. Campos; Thomas J. Luecke; Heather K. Wendeln; Kumika Toma; Fredrick C. Hagerman; Thomas F. Murray; Kerry E. Ragg; Nicholas A. Ratamess; William J. Kraemer; Robert S. Staron · 2002 · Primary research
Primary empirical supportLimiting / contrary
Exercise training and nutritional supplementation for physical frailty in very elderly people
Maria A. Fiatarone; Evelyn F. O'Neill; Nancy Doyle Ryan; Karen M. Clements; Guido R. Solares; Miriam E. Nelson; Susan B. Roberts; Joseph J. Kehayias; Lewis A. Lipsitz; William J. Evans · 1994 · Primary research
Primary empirical supportLimiting / contrary
Effects of maximal isometric and isokinetic resistance training on strength and functional mobility in older adults
T. Brock Symons; Anthony A. Vandervoort; Charles L. Rice; Tom J. Overend; Greg D. Marsh · 2005 · Primary research
Primary empirical supportLimiting / contrary
Effects of concentric and eccentric training on muscle strength, cross-sectional area, and neural activation
Elizabeth J. Higbie; Kirk J. Cureton; Gordon L. Warren III; Barry M. Prior · 1996 · Primary research
Primary empirical support
Strength training reduces force fluctuations during anisometric contractions of the quadriceps femoris muscles in old adults
Brian L. Tracy; William C. Byrnes; Roger M. Enoka · 2004 · Primary research
Limiting / contraryOfficial boundary context
WHO guidelines on physical activity and sedentary behaviour
World Health Organization · 2020 · Official guidance

Read the complete evidence interpretation on the Power dossier.

Tutorial delivery controls

Learn, adapt, troubleshoot and resume

Estimated timeEstimated 23 min reading; practical time is provider-set

DifficultyAdvanced

EquipmentSpecialist equipment

SpaceSpecialist setting

Method qualityComprehensive10 of 10 structural checks present. Automated method-readiness band; human editorial sign-off is separate.

Evidence contextG4; Deep research depthScientific support is evaluated separately from teaching-method structure.

Editorial reviewPending manual sign-offNo human approval is claimed until reviewer, date and content hash are recorded.

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Step-by-step learner mode

Each activity includes its success check, a nearby accessible alternative and an “I’m stuck” correction path. Alternatives preserve the target where possible; when they change the task, Titan labels them as related rather than equivalent.

Name the exact test

Say aloud which leg is being tested and what it must do. A complete description is: right knee extension, seated, knee fixed at the recorded angle, pushing the shin forward into this stationary dynamometer pad.

Why this step exists

Maximal force changes with the joint angle, side, body position and device. Naming the task prevents an accidental substitution.

Success check

Learner and provider independently give the same side, movement, position and device description.

I’m stuck on this step

Reset: Re-read this authored instruction — “Say aloud which leg is being tested and what it must do. A complete description is: right knee extension, seated, knee fixed at the recorded angle, pushing the shin forward into this stationary dynamometer pad.” — and its success check, then attempt only this step.

Possible snag: The pad or knee angle changes between trials.
Correction: Pause, restore and record the original configuration; do not compare the changed attempt as though it were identical.

Stop / get help: Stop immediately for chest pain, faintness, severe or unusual headache, dizziness, unusual breathlessness, visual disturbance, new weakness, numbness or another neurological change.

Mark step 1 complete

Sit fully back in the chair

Move the hips to the back of the seat. Place the trunk against the back support, keep the pelvis level and put the hands in the provider-named position. Let the untested foot rest where the provider places it.

Why this step exists

Sliding forward, arching or pulling with the arms lets other parts of the body add force to the display.

Success check

The back and pelvis remain in contact with the supports while the learner makes a very light practice push.

I’m stuck on this step

Reset: Re-read this authored instruction — “Move the hips to the back of the seat. Place the trunk against the back support, keep the pelvis level and put the hands in the provider-named position. Let the untested foot rest where the provider places it.” — and its success check, then attempt only this step.

Possible snag: The result from “Move the hips to the back of the seat. Place the trunk against the back support, keep the pelvis level and put the hands in the provider-named position. Let the untested foot rest where the provider places it.” does not yet meet this declared check: The back and pelvis remain in contact with the supports while the learner makes a very light practice push.
Correction: Return to the start of “Sit fully back in the chair”, reduce complexity or pace, and repeat only the part needed to satisfy: “The back and pelvis remain in contact with the supports while the learner makes a very light practice push.”

Mark step 2 complete

Align the knee and lever

Let the provider line up the side of the knee with the dynamometer's turning axis, set the declared knee angle and place the pad on the recorded part of the lower shin. Say immediately if the pad pinches, presses on an injured area or causes numbness.

Why this step exists

Poor alignment changes the lever distance, can make the number misleading and may create avoidable joint or skin pressure.

Success check

The provider records the knee angle, seat code and pad position, and the learner can tolerate a light contact check without pain or slipping.

I’m stuck on this step

Reset: Re-read this authored instruction — “Let the provider line up the side of the knee with the dynamometer's turning axis, set the declared knee angle and place the pad on the recorded part of the lower shin. Say immediately if the pad pinches, presses on an injured area or causes numbness.” — and its success check, then attempt only this step.

Possible snag: A newton value is reported as knee torque without a measured lever distance.
Correction: Keep the result in newtons unless the provider has recorded the moment arm and the device validly calculates N·m.

Mark step 3 complete

Accept the supports without fighting them

Allow the provider to fasten the approved pelvic and thigh supports so the body cannot slide, while confirming that breathing and circulation remain comfortable. Do not tighten, loosen or reposition a strap during a trial.

Why this step exists

The supports keep the measured action at the knee, but a painful, restrictive or altered support invalidates the setup.

Success check

The learner can breathe normally, the skin is comfortable and a gentle push produces no visible seat or strap movement.

I’m stuck on this step

Reset: Re-read this authored instruction — “Allow the provider to fasten the approved pelvic and thigh supports so the body cannot slide, while confirming that breathing and circulation remain comfortable. Do not tighten, loosen or reposition a strap during a trial.” — and its success check, then attempt only this step.

Possible snag: The result from “Allow the provider to fasten the approved pelvic and thigh supports so the body cannot slide, while confirming that breathing and circulation remain comfortable. Do not tighten, loosen or reposition a strap during a trial.” does not yet meet this declared check: The learner can breathe normally, the skin is comfortable and a gentle push produces no visible seat or strap movement.
Correction: Return to the start of “Accept the supports without fighting them”, reduce complexity or pace, and repeat only the part needed to satisfy: “The learner can breathe normally, the skin is comfortable and a gentle push produces no visible seat or strap movement.”

Mark step 4 complete

Give the device a quiet baseline

Let the tested leg become heavy against the pad without pushing. Relax the jaw, shoulders, hands and thigh until the provider confirms a quiet zero-force baseline. If the screen shows force before the cue, relax again rather than asking for it to be subtracted later.

Why this step exists

Preloading hides the true start of the contraction and can inflate the apparent peak.

Success check

The force-time line is stable at the provider's accepted zero before the ready cue.

I’m stuck on this step

Reset: Re-read this authored instruction — “Let the tested leg become heavy against the pad without pushing. Relax the jaw, shoulders, hands and thigh until the provider confirms a quiet zero-force baseline. If the screen shows force before the cue, relax again rather than asking for it to be subtracted later.” — and its success check, then attempt only this step.

Possible snag: The learner begins pushing during ready.
Correction: Return completely to zero, rehearse ready as a relaxation cue and restart only when the baseline is quiet.

Mark step 5 complete

Rehearse the four cues

On ready, stay still and breathe. On build, begin increasing pressure. On hold, maintain the strongest controlled push while the pad remains motionless. On stop, release all pressure at once and remain seated. Rehearse this once without a hard effort.

Why this step exists

Knowing the sequence prevents an early start, sudden kick or delayed release during the scored attempt.

Success check

The no-load rehearsal contains a relaxed start, correctly timed build and immediate release.

I’m stuck on this step

Reset: Re-read this authored instruction — “On ready, stay still and breathe. On build, begin increasing pressure. On hold, maintain the strongest controlled push while the pad remains motionless. On stop, release all pressure at once and remain seated. Rehearse this once without a hard effort.” — and its success check, then attempt only this step.

Possible snag: The result from “On ready, stay still and breathe. On build, begin increasing pressure. On hold, maintain the strongest controlled push while the pad remains motionless. On stop, release all pressure at once and remain seated. Rehearse this once without a hard effort.” does not yet meet this declared check: The no-load rehearsal contains a relaxed start, correctly timed build and immediate release.
Correction: Return to the start of “Rehearse the four cues”, reduce complexity or pace, and repeat only the part needed to satisfy: “The no-load rehearsal contains a relaxed start, correctly timed build and immediate release.”

Mark step 6 complete

Complete the graded familiarisation pushes

Perform only the provider-selected light and moderate practice pushes. For each one, build gradually, keep the body still, stop on cue and relax fully during the timed recovery. Treat these as technique practice, not chances to obtain a maximum.

Why this step exists

Familiarisation lets the learner feel the pad and signals before a hard effort without hiding extra maximal exposure in the warm-up.

Success check

Every practice trace begins at zero, rises smoothly and returns to zero without pain, body movement or an unintended maximal push.

I’m stuck on this step

Reset: Re-read this authored instruction — “Perform only the provider-selected light and moderate practice pushes. For each one, build gradually, keep the body still, stop on cue and relax fully during the timed recovery. Treat these as technique practice, not chances to obtain a maximum.” — and its success check, then attempt only this step.

Possible snag: The learner watches the display and keeps pressing past stop.
Correction: Move the display out of the learner's focus and make the provider's stop cue the only end signal.
Possible snag: The learner repeats a maximum independently between appointments.
Correction: Use only the provider's scheduled retest. Practising the method does not grant authority to reproduce maximal exposure.

Mark step 7 complete

Reset before the scored effort

During the full provider-timed rest, let the thigh soften and check that the back, pelvis, hands, foot and pad still match the recorded setup. Tell the provider how the knee and whole body feel before agreeing to continue.

Why this step exists

Fatigue, symptoms or a small position change can make the next trace unsafe or incomparable.

Success check

Symptoms remain acceptable, the configuration key is unchanged and the device again shows a quiet zero-force baseline.

I’m stuck on this step

Reset: Re-read this authored instruction — “During the full provider-timed rest, let the thigh soften and check that the back, pelvis, hands, foot and pad still match the recorded setup. Tell the provider how the knee and whole body feel before agreeing to continue.” — and its success check, then attempt only this step.

Possible snag: The result from “During the full provider-timed rest, let the thigh soften and check that the back, pelvis, hands, foot and pad still match the recorded setup. Tell the provider how the knee and whole body feel before agreeing to continue.” does not yet meet this declared check: Symptoms remain acceptable, the configuration key is unchanged and the device again shows a quiet zero-force baseline.
Correction: Return to the start of “Reset before the scored effort”, reduce complexity or pace, and repeat only the part needed to satisfy: “Symptoms remain acceptable, the configuration key is unchanged and the device again shows a quiet zero-force baseline.”

Mark step 8 complete

Build the maximal push smoothly

Wait for build. Press the shin forward into the stationary pad and build force smoothly over about two seconds—like turning up a control, not kicking a door. Keep the back and pelvis against the supports, keep the hands quiet and continue breathing instead of closing the throat.

Why this step exists

A controlled rise measures voluntary knee-extension force. A kick, hip lift, arm pull or breath-holding changes the task and can produce an unsafe or false spike.

Success check

The trace has a continuous rising slope, with no pre-cue force, impact spike, seat movement or breath-hold warning.

I’m stuck on this step

Reset: Re-read this authored instruction — “Wait for build. Press the shin forward into the stationary pad and build force smoothly over about two seconds—like turning up a control, not kicking a door. Keep the back and pelvis against the supports, keep the hands quiet and continue breathing instead of closing the throat.” — and its success check, then attempt only this step.

Possible snag: The result from “Wait for build. Press the shin forward into the stationary pad and build force smoothly over about two seconds—like turning up a control, not kicking a door. Keep the back and pelvis against the supports, keep the hands quiet and continue breathing instead of closing the throat.” does not yet meet this declared check: The trace has a continuous rising slope, with no pre-cue force, impact spike, seat movement or breath-hold warning.
Correction: Return to the start of “Build the maximal push smoothly”, reduce complexity or pace, and repeat only the part needed to satisfy: “The trace has a continuous rising slope, with no pre-cue force, impact spike, seat movement or breath-hold warning.”

Mark step 9 complete

Hold until the provider says stop

At the top of the effort, keep pressing as strongly and steadily as you can while the pad stays fixed. Do not pump the leg, bounce, twist or search for a better angle. Listen for the stop cue rather than watching the number.

Why this step exists

A brief clean peak or plateau is easier to interpret than a moving, pulsing or posture-changing effort.

Success check

The highest part of the trace occurs while the declared angle and body position remain unchanged.

I’m stuck on this step

Reset: Re-read this authored instruction — “At the top of the effort, keep pressing as strongly and steadily as you can while the pad stays fixed. Do not pump the leg, bounce, twist or search for a better angle. Listen for the stop cue rather than watching the number.” — and its success check, then attempt only this step.

Possible snag: The result from “At the top of the effort, keep pressing as strongly and steadily as you can while the pad stays fixed. Do not pump the leg, bounce, twist or search for a better angle. Listen for the stop cue rather than watching the number.” does not yet meet this declared check: The highest part of the trace occurs while the declared angle and body position remain unchanged.
Correction: Return to the start of “Hold until the provider says stop”, reduce complexity or pace, and repeat only the part needed to satisfy: “The highest part of the trace occurs while the declared angle and body position remain unchanged.”

Mark step 10 complete

Release immediately and recover

Release immediately on the stop cue. Let the leg become completely heavy, remain seated and breathe normally. Report what you felt before moving, unfastening supports or asking for another attempt.

Why this step exists

An immediate release shows the end of the test clearly and gives the provider a chance to detect symptoms before the learner stands.

Success check

Force returns promptly to baseline and no concerning symptom, delayed pressure or extra push appears after the stop cue.

I’m stuck on this step

Reset: Re-read this authored instruction — “Release immediately on the stop cue. Let the leg become completely heavy, remain seated and breathe normally. Report what you felt before moving, unfastening supports or asking for another attempt.” — and its success check, then attempt only this step.

Possible snag: The result from “Release immediately on the stop cue. Let the leg become completely heavy, remain seated and breathe normally. Report what you felt before moving, unfastening supports or asking for another attempt.” does not yet meet this declared check: Force returns promptly to baseline and no concerning symptom, delayed pressure or extra push appears after the stop cue.
Correction: Return to the start of “Release immediately and recover”, reduce complexity or pace, and repeat only the part needed to satisfy: “Force returns promptly to baseline and no concerning symptom, delayed pressure or extra push appears after the stop cue.”

Mark step 11 complete

Validate before choosing a result

With the provider, inspect baseline, onset, smooth rise, peak or plateau, release and any movement or equipment flags. Label the trace valid or rejected before comparing numbers. Complete another maximum only if the provider authorises it after full rest. Report the best valid peak, not the largest screen number.

Why this step exists

A large number created by preload, a kick, hip lift, device clipping or changed setup is not maximal knee-extension force for the declared test.

Success check

Every attempt remains visible with a validity reason, and the accepted result comes only from a clean trace obtained in the unchanged setup.

I’m stuck on this step

Reset: Re-read this authored instruction — “With the provider, inspect baseline, onset, smooth rise, peak or plateau, release and any movement or equipment flags. Label the trace valid or rejected before comparing numbers. Complete another maximum only if the provider authorises it after full rest. Report the best valid peak, not the largest screen number.” — and its success check, then attempt only this step.

Possible snag: The effort starts with a kick.
Correction: Practise a light two-second ramp and use the image of steadily turning up a control before another authorised maximum.
Possible snag: The pelvis slides or lifts near the peak.
Correction: Reject the trace, inspect seat fit and supports, and let the provider decide whether another trial is appropriate.
Possible snag: Only the largest number is written down.
Correction: Retain every raw trace, setup key, symptom note and validity decision before selecting the best valid peak.
Possible snag: Familiarisation efforts are mixed with maximal attempts.
Correction: Label practice and scored traces before testing begins, and never relabel a warm-up as a maximum.
Possible snag: A functional task is blended into a strength score.
Correction: Put chair-rise seconds or another functional observation in a separate result field with its own interpretation.

Mark step 12 complete

Correct versus incorrect execution

These accessible process diagrams are built from the tutorial’s own right/wrong teaching. They are not anatomical illustrations and do not add technique beyond the canonical tutorial.

Waiting at the start — A preloaded start hides contraction onset and changes the measured effort.

Correct / safer

Make the leg heavy and give the device a quiet zero-force baseline.

Wrong / riskier

Lean into the pad before ready and ask the provider to subtract the preload later.

Beginning the hard effort — An impact spike can reflect momentum and body movement rather than controlled isometric force.

Correct / safer

Build pressure progressively over about two seconds after the build cue.

Wrong / riskier

Kick the pad as hard and fast as possible to create a tall spike.

Using the chair supports — Those actions recruit other body segments and alter the declared knee-extension test.

Correct / safer

Keep the back and pelvis touching the recorded supports.

Wrong / riskier

Arch, twist, lift a hip or pull against the chair to add force.

Breathing — Deliberate breath-holding increases strain and can conceal an important symptom.

Correct / safer

Keep air moving and use the agreed stop signal if breathing becomes difficult.

Wrong / riskier

Close the throat and hold the breath until the number appears.

Ending the effort — An extra push exceeds the authorised exposure, and standing too soon can miss post-effort symptoms.

Correct / safer

Release immediately on the stop cue and remain seated for the symptom check.

Wrong / riskier

Keep squeezing for an extra peak after stop or stand up immediately.

Selecting the reported peak — Magnitude cannot rescue an attempt that did not follow the declared method.

Correct / safer

Use the best valid peak after trace and posture review.

Wrong / riskier

Choose the largest screen number even when the pelvis moved or the trace clipped.

Comparing another visit — Configuration changes alter leverage and measurement conditions.

Correct / safer

Compare only the same dynamometer, knee angle and pad position, with the same cue and validity rules.

Wrong / riskier

Call a different machine, angle or pad placement an improvement in the same test.

Interpreting transfer — A fixed seated knee test does not measure those whole tasks.

Correct / safer

Keep the functional result separate and test it directly.

Wrong / riskier

Treat 399 N as proof that Maya can safely lift, climb stairs or return to work.

Method-structure checklist

10 of 10 structural checks present

Ordered, Power-specific instructions — present
Every activity has a success check — present
Materials or supplied records are declared — present
Measurement or assessment rule is present — present
Tutorial-specific troubleshooting is present — present
Stopping or escalation boundary is present — present
Every activity has an adjacent alternative — present
Correct-versus-incorrect comparison is present — present
Evidence context is bound to the Power record — present
Planning metadata is present — present

The method-readiness band and presence checklist assess tutorial presentation and are separate from evidence quality for the underlying Power. They are automated editorial aids, not human approval.

Manual editorial sign-off: Pending. This tutorial must not display a human-approved state until an identified editor signs the exact content hash.