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Related Experiment Video

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Author Spotlight: Enhancing Upper Limb Rehabilitation in Stroke Patients Through Advanced Robotic and Neuromodulation Technologies

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Muscle recruitment and coordination during upper-extremity functional tests.

Keshia M Peters¹, Valerie E Kelly², Tasha Chang²

¹Mechanical Engineering, University of Washington, Seattle, WA, United States.

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

|December 19, 2017

Summary

This study measured muscle activity during common hand function tests in unimpaired individuals. Results show low muscle activation, providing a baseline for assessing neurologic injury recovery.

Keywords:

Box and block Chedoke Cocontraction Electromyography Jebsen Taylor

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Area of Science:

Neuroscience
Biomechanics
Rehabilitation Science

Background:

Performance-based tests like the Jebsen Taylor Hand Function Test are crucial for assessing functional recovery after neurologic injury.
Understanding the underlying muscle activity during these tests is essential for accurate interpretation of results.
Current knowledge of muscle recruitment patterns in unimpaired individuals during these tasks is limited.

Purpose of the Study:

To quantify muscle recruitment and coordination in both dominant and non-dominant limbs during common clinical hand function tests.
To establish baseline electromyography (EMG) data for unimpaired individuals performing these functional tasks.
To identify differences in muscle activation patterns between limbs and task types.

Main Methods:

Bilateral electromyography (EMG) recordings were collected from eight arm muscles in twenty healthy participants.
Participants performed standardized clinical hand function tests.
EMG data, including signal magnitudes and activation times, were normalized to maximum voluntary isometric contractions (MVICs) and analyzed for cocontraction levels.

Main Results:

Functional tests generally required low muscle activity (average <6.5% MVIC), with the extensor digitorum showing higher activation in the dominant arm (11.7 ± 2.7% MVIC).
Co-contraction levels ranged from 25% to 62% across all tested muscle pairs and tasks.
Tasks emphasizing speed over movement quality exhibited greater muscle recruitment.

Conclusions:

These findings establish normative muscle activation data for common clinical hand function tests in unimpaired individuals.
The established baselines can aid in identifying and quantifying muscle-specific deficits following neurologic injury.
This research provides a foundation for tracking functional recovery and guiding rehabilitation strategies using established clinical assessments.