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Related Experiment Video

Updated: Jun 2, 2026

Force and Position Control in Humans - The Role of Augmented Feedback

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

Joint angle affects volitional and magnetically-evoked neuromuscular performance differentially.

C Minshull¹, D Rees, N P Gleeson

¹School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK. claire.minshull@ntu.ac.uk

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology

|May 3, 2011

Summary

This summary is machine-generated.

Neuromuscular performance of the quadriceps femoris improves with knee flexion. However, volitional performance improves more than magnetically-evoked performance, suggesting predictions between the two lack robustness.

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Last Updated: Jun 2, 2026

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Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Published on: September 13, 2015

Area of Science:

Biomechanics
Human physiology
Neuromuscular function

Background:

Understanding quadriceps femoris neuromuscular performance is crucial for assessing muscle function.
Knee joint angle significantly influences muscle force production and activation dynamics.

Purpose of the Study:

To investigate the effects of knee joint angles on volitional and magnetically-evoked neuromuscular performance of the quadriceps femoris.
To compare the relative changes in volitional versus evoked neuromuscular indices across different knee flexion angles.

Main Methods:

Assessed neuromuscular performance in 15 healthy males at 25°, 35°, and 45° of knee flexion.
Measured volitional and magnetically-evoked peak force and electromechanical delay.
Utilized magnetic stimulation to evoke muscle contractions.

Main Results:

Both volitional and magnetically-evoked peak force and electromechanical delay increased with greater knee flexion.
Relative improvements in volitional indices were greater than evoked indices with increasing flexion.
No significant correlations were found between volitional and evoked measures at analogous or adjacent joint positions.

Conclusions:

The differential between volitional and evoked neuromuscular performance is joint angle-specific.
Predictions of volitional performance from evoked performance are not robust across different knee joint angles.
Increased knee flexion reduces the relative difference between volitional and evoked neuromuscular capabilities.