Journal of Rehabilitation Research & Development (JRRD)

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Volume 49 Number 10, 2012
   Pages 1527 — 1536

Abstract — Effect of velocity on shoulder muscle recruitment patterns during wheelchair propulsion in nondisabled individuals: Pilot study

Liping Qi, PhD;1–2 James Wakeling, PhD;3 Simon Grange, PhD;1–2 Martin Ferguson-Pell, PhD2*

1ASPIRE Centre for Disability Sciences, Institute of Orthopedics and Musculoskeletal Science, University College London, Brockley Hill, Stanmore, London, United Kingdom; 2Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Alberta, Canada; 3Department of Biomedical Physiology and Kinesiology, Simon Fraser
University, Burnaby, British Columbia, Canada

Abstract–This study investigated how the recruitment patterns of shoulder muscles were influenced by wheelchair propulsion speed. Electromyography (EMG) activity of seven muscles was recorded with surface electrodes on 15 nondisabled subjects during wheelchair propulsion on a stationary ergometer. Kinetic data were measured by a SmartWheel. EMG total intensities were calculated to describe the muscle activation level, while the angles formed by first principal component and second principal component loading scores were calculated to describe the spectral content of EMG signals. Significant differences were observed in kinetic variables between the two testing speeds (p < 0.05). The EMG intensity of the tested muscles increased significantly with increased speed (p < 0.05). The push muscles showed a longer EMG duration, whereas the recovery muscles exhibited significantly earlier EMG onset and peak activities at the fast speed. The smaller angle values in the fast propulsion speed indicated that faster motor units were recruited to match the mechanical requirement for the faster motion. Pushing a manual wheelchair at a faster speed not only requires a higher level of propulsive muscle activity but also a higher level of recovery muscle activation.

Key words: electromyography, ergometer, fast fiber, kinetics, motor unit recruitment strategy, muscle synergy, principal component analysis, rehabilitation, slow fiber, wavelet analysis.

View HTML  ¦  View PDF  ¦  Contents Vol. 49, No. 10
This article and any supplementary material should be cited as follows:
Qi L, Wakeling J, Grange S, Ferguson-Pell M. Effect of velocity on shoulder muscle recruitment patterns during wheelchair propulsion in nondisabled individuals: Pilot study. J Rehabil Res Dev. 2012;49(10):1527–36.

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