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Quantifying Arms and Legs Contributions during Repetitive Electrically-Assisted Sit-To-Stand Exercise in Paraplegics: A Pilot Study

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Inter-joint coordination variability during a sit-to-stand fatiguing protocol.

Szu-Hua Chen¹, Li-Shan Chou²

¹Department of Physical Therapy, Ithaca College, Ithaca, NY 14850, USA; Department of Human Physiology, University of Oregon, Eugene, OR 97403, USA.

Journal of Biomechanics

|May 15, 2022

Summary

This summary is machine-generated.

Fatigue during sit-to-stand (STS) tasks increases hip-knee and knee-ankle movement variability. This change in body movement, not just muscle strength, indicates fatigue in both young and older adults.

Keywords:

Aging Continuous relative phase Fatigue Sit-to-stand Variability

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Area of Science:

Biomechanics
Human Movement Science
Gerontology

Background:

Repetitive sit-to-stand (STS) tasks are common fatigue-inducing protocols.
While muscle strength decline is a known fatigue indicator, changes in movement coordination during fatiguing processes are less understood.

Purpose of the Study:

To investigate alterations in hip-knee and knee-ankle coordination variability during a fatiguing STS task.
To compare these changes between young and older adults.

Main Methods:

15 young and 15 older adults performed repetitive STS movements to exhaustion or for 30 minutes.
Motion data were collected, time-normalized, and analyzed across five stages of the fatiguing course.
A 2x5 mixed-effects ANOVA examined age and time effects on inter-joint coordination variability.

Main Results:

Hip-knee coordination variability significantly increased throughout the STS fatiguing course in all participants, irrespective of age.
Knee-ankle coordination variability also increased from the beginning to the end of the protocol.
No significant age-by-time interaction was observed for either coordination variability measure.

Conclusions:

Fatigue during repetitive STS tasks impacts not only muscle strength but also increases inter-joint coordination variability.
Increased coordinative variability can serve as a potential indicator of fatigue during functional tasks.
These findings highlight movement changes as a crucial aspect of fatigue assessment across different age groups.