Brake a moving load through one marked lowering arc

Reset: Re-read this authored instruction — “Point from start angle to finish angle. Say, 'My knee bends while I brake this arm.' Name midpoint as a separate landmark.” — and its success check, then attempt only this step.

1. Possible snag: Participant describes a slow lift instead of braking.

   Correction: Trace direction from raised start toward bent-knee finish and repeat receive-lower-unload.

Stop / get help: Abort for sharp pain, pop, sudden weakness, swelling, instability, numbness or uncontrolled apparatus motion.

Reset: Re-read this authored instruction — “Sit against backrest while clinician aligns knee axis, secures pelvis and positions shin pad. Perform an unloaded sweep, then a light receive-lower-unload rehearsal.” — and its success check, then attempt only this step.

1. Possible snag: Arm stops at midpoint.

   Correction: Mark a stall; use velocity cue during any further clinician-authorised rehearsal.

Stop / get help: Abort for sharp pain, pop, sudden weakness, swelling, instability, numbness or uncontrolled apparatus motion.

Reset: Re-read this authored instruction — “Remain relaxed while apparatus places its arm at start. On receive, meet already-supported resistance smoothly—no upward pull, kick or sudden catch.” — and its success check, then attempt only this step.

1. Possible snag: The result from “Remain relaxed while apparatus places its arm at start. On receive, meet already-supported resistance smoothly—no upward pull, kick or sudden catch.” does not yet meet this declared check: Curve begins without impact and arm waits at start until lower command.

   Correction: Return to the start of “Receive supported tension”, reduce complexity or pace, and repeat only the part needed to satisfy: “Curve begins without impact and arm waits at start until lower command.”

Stop / get help: Abort for sharp pain, pop, sudden weakness, swelling, instability, numbness or uncontrolled apparatus motion.

Reset: Re-read this authored instruction — “On lower, permit knee flexion while maintaining pressure against moving arm, like controlling a heavy door. Avoid freezing or letting descent run away.” — and its success check, then attempt only this step.

1. Possible snag: The result from “On lower, permit knee flexion while maintaining pressure against moving arm, like controlling a heavy door. Avoid freezing or letting descent run away.” does not yet meet this declared check: Angular velocity remains inside its declared corridor and braking torque persists through first half.

   Correction: Return to the start of “Allow movement while braking”, reduce complexity or pace, and repeat only the part needed to satisfy: “Angular velocity remains inside its declared corridor and braking torque persists through first half.”

Stop / get help: Abort for sharp pain, pop, sudden weakness, swelling, instability, numbness or uncontrolled apparatus motion.

Reset: Re-read this authored instruction — “Continue resisting beyond midpoint to finish. Keep pelvis level and torso supported. If control disappears, signal abort instead of catching a falling arm.” — and its success check, then attempt only this step.

1. Possible snag: The result from “Continue resisting beyond midpoint to finish. Keep pelvis level and torso supported. If control disappears, signal abort instead of catching a falling arm.” does not yet meet this declared check: Final bins retain torque without acceleration, twisting or shortened travel.

   Correction: Return to the start of “Brake through the final third”, reduce complexity or pace, and repeat only the part needed to satisfy: “Final bins retain torque without acceleration, twisting or shortened travel.”

Stop / get help: Abort for sharp pain, pop, sudden weakness, swelling, instability, numbness or uncontrolled apparatus motion.

Reset: Re-read this authored instruction — “At finish, follow unload command. Relax quadriceps while apparatus removes resistance and restores start position. Never lift during reset.” — and its success check, then attempt only this step.

1. Possible snag: Participant drives reset upward.

   Correction: Segment descent, unload and passive return; exclude contaminated repetition.

Stop / get help: Abort for sharp pain, pop, sudden weakness, swelling, instability, numbness or uncontrolled apparatus motion.

Reset: Re-read this authored instruction — “Before reading peak N·m, label each curve smooth arc, catch-and-drop, mid-arc hole or end-range dump. Check angular speed beside torque in every bin.” — and its success check, then attempt only this step.

1. Possible snag: Torque vanishes near finish.

   Correction: Label exact missing bins as an end-range dump; never hide them with peak averaging.

Stop / get help: Abort for sharp pain, pop, sudden weakness, swelling, instability, numbness or uncontrolled apparatus motion.

Reset: Re-read this authored instruction — “After recovery, document immediate symptoms and separate step-down observation. Add later-that-day and next-morning soreness, swelling and ordinary-activity change before another loaded decision.” — and its success check, then attempt only this step.

1. Possible snag: Only immediate discomfort is noted.

   Correction: Complete evening and next-morning entries before another loaded choice.

2. Possible snag: Device torque becomes a stair-safety claim.

   Correction: Keep supported step-down data separate and limit interpretation to programmed arc and speed.

Stop / get help: Abort for sharp pain, pop, sudden weakness, swelling, instability, numbness or uncontrolled apparatus motion.