Abstract
The purpose of this study was to describe the intermittent velocity variation of wheelchair propulsion and to determine the relationship between selected wheelchair propulsive characteristics and peak velocity. The subjects were 11 (10 males and 1 female) members of the U.S. 1988 Paralympic Track and Field Team. Each subject’s personal racing chair was mounted on a Pro Roller. Intermittent velocity was ascertained by a tach-generator. A stationary 16-mm Locam camera was used to photograph the subject’s sagittal plane propulsive movements. A sonic digitizer was used to digitize three complete propulsive cycles for each subject. Paraplegic and quadriplegic subjects’ stroke frequency mean values were 2.27 and 1.80 Hz, respectively. Significant correlations between the Pro Roller’s computer-generated peak velocity values and hand-handrim positions were indicated. Handrim contact angles and trunk angles were approximately 30 to 40° forward of the same angles reported in the literature. Results indicate that a forward lean of the trunk may allow the athlete to increase the range of hand-handrim contact.
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