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Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion
Published on: February 5, 2020
The effect of variable practice on wheelchair propulsive efficiency and propulsive timing
W X Yao1, A Cordova, W De Sola
1Department of Health and Kinesiology, College of Education and Human Development, The University of Texas at San Antonio, San Antonio, TX, USA. wanxiang.yao@utsa.edu
European Journal of Physical and Rehabilitation Medicine
|November 11, 2011
Summary
Variable practice (VP) significantly improves wheelchair propulsion efficiency more than constant practice (CP). This finding offers a more effective training method for individuals requiring enhanced upper-extremity function.
Area of Science:
- Biomechanics
- Motor Learning
- Rehabilitation Science
Background:
- Wheelchair propulsion has low net mechanical efficiency (~13%).
- Effective practice methods are needed to improve energy expenditure during wheelchair propulsion.
- Variable practice (VP) is known to enhance motor-skill learning compared to constant practice (CP).
Purpose of the Study:
- To investigate the effects of VP and CP on wheelchair propulsive efficiency and timing.
- To determine if VP is superior to CP in enhancing propulsive efficiency.
Main Methods:
- An experimental study involving 33 able-bodied participants randomly assigned to three groups: two constant practice (CP) groups (30% and 55% max speed) and one variable practice (VP) group (both speeds).
- Measurements included propulsive efficiency, timing, and intercycle variability of timing.
- Training was conducted in a controlled university laboratory setting.
Main Results:
- All training groups showed significant improvements in propulsive efficiency, timing, and intercycle variability.
- The variable practice (VP) group demonstrated greater improvements in propulsive efficiency compared to both constant practice (CP) groups.
Conclusions:
- This study provides the first evidence that variable practice (VP) is more effective than constant practice (CP) for improving wheelchair propulsive efficiency.
- The findings have significant implications for improving the functional capacity and reducing the energy demands of upper-extremity activities for individuals with paraplegia.
