Article

This study aimed to first investigate synchronous (SYN) versus
asynchronous (ASY) mode of propulsion and, second, investigate the wheel camber
effects on sprinting performance as well as temporal parameters. METHOD: Seven
wheelchair basketball players performed four maximal eight-second sprints on a
wheelchair ergometer. They repeated the test according to two modes of propulsion
(SYN and ASY) and two wheel cambers (9 degrees and 15 degrees ). RESULTS: The
mean maximal velocity and push power output was greater in the synchronous mode
compared to the asynchronous mode for both camber angles. However, the
fluctuation in the velocity profile is inferior for ASY versus SYN mode for both
camber angles. Greater push time/cycle time (Pt/Ct) and arm frequency (AF) for
synchronous mode versus asynchronous mode and inversely, lesser Ct and rest time
(Rt) values for the synchronous mode, for which greater velocity were observed.
CONCLUSIONS: SYN mode leads to better performance than ASY mode in terms of
maximal propulsion velocity. However, ASY propulsion allows greater continuity of
the hand-rim force application, reducing fluctuations in the velocity profile.
The camber angle had no effect on ASY and SYN mean maximal velocity and push
power output. IMPLICATIONS FOR REHABILITATION: The study of wheelchair propulsion
strategies is important for better understanding physiological and biomechanical
impacts of wheelchair propulsion for individuals with disabilities. From a
kinematical point of view, this study highlights synchronous mode of propulsion
to be more efficient, with regards to mean maximal velocity reaching during
maximal sprinting exercises. Even if this study focuses on well-trained
wheelchair athletes, results from this study could complement the knowledge on
the physiological and biomechanical adaptations to wheelchair propulsion and
therefore, might be interesting for wheelchair modifications for purposes of
rehabilitation.

Langue : ANGLAIS