01Assess
Set a suitable reference.
Record a comfortable reference during the clinician-selected task. Check the signal and document the position, instruction and sensor placement before choosing an activity band.
What are we comparing?APPLICATION GUIDE / ORTHOPAEDICS
Make the contraction count.
Consider someone after a knee injury who finds it hard to feel the quadriceps engage during a clinician-guided exercise. Focus the session on contraction, hold and release.
Start with a goal.
During an agreed knee-extension task, practise bringing the selected quadriceps signal into a suitable band and releasing between attempts. The clinician chooses the load and timing; muscle activity is not measured strength.
02Practise
Follow the hold cue.
Activate towards the chosen band, follow the hold cue, then release during rest. The clinician can adjust the instruction or target while keeping the task understandable.
Which instruction is useful here?03Review
Review the attempts.
Review time on target and the release between attempts alongside movement and comfort. Keep the cue, adapt the task or choose another exercise for comparison.
What should change next time?Quadriceps activity
Work / rest cue
ActivateHoldRelease
The setup follows the task.
- One EMG channel per selected quadriceps site, with consistent setup and an appropriate reference.
- Joint-angle context requires calibrated sensors on the relevant segments and a supported model.
- Muscle activity is not a direct measure of force, healing or sport readiness.
Further reading.
myoact describes task-specific EMG work during ACL rehabilitation. Noraxon’s post-ACL case examines movement with Ultium Motion and myoRESEARCH.