ABSTRACT

　Purpose: Wheelchair race of the Paralympic games have become increasingly popular in the last few years. Development of a wheelchair is record improve very itbeing important of an athlete. However, there are little quantification of mechanicaloutput of an athlete playing a game and kinematic information while development andstudy of a wheelchair advance. The purpose of this study was to biomechanics analysisof wheelchair sprint racing the 100m and 400m race simulations using wheelchairergometer. Methods: The six wheelchair athletes （age:40.5±7.2yrs. BH:165.5±7.6cm, BW:55.5±8.7kg, Class: T53,54, 100m time:16.08±1.03s, 400m time:54.41±7.37s） were participated in this study. Subjects were performed 100m and 400m racesimulation each wheelchair racer attach on wheelchair ergometer system （1kHz,KEKU,Canada）. Reflective marker was attached to the upper limb anatomical point:acromion, humeral lateral epicondyle, ulnar styloid, Finger the second metatarsal.Upper limb extremity kinematics data was analysed using the motion capture system（200fps, BTS, Italy）. During race simulate mechanical model was applied formprimary research. One stroke wheelchair power output was calculated from push forceand disk velocity. One cycle time of spatio-temporal parameters were determined bypower curve, stroke frequency（ SF） was calculated from the reciprocal number. Strokelength was divide average of one cycle velocity by frequency（ SL）. Mechanical poweroutput and spatio-temporal parameters of race simulations were indicated Mean±SDeach 10m or 50m phase.　Results: In 100m race simulation, maximum speed was appeared just before 100m,but the 400m race simulation was indicated between 100m and 150m phases. Strokefrequency was not difference between 100m and 400m race simulations. As for thevelocity of both races, what SL influenced than SF was accepted. As for the force,decrease was present, but the power display was steady in 100m race simulation. On theother hand, in 400m race simulation was indicated that decrease both force and poweroutput. Maximum velocity was not significant difference between 100m（8.13±0.8m/s）and 400m（8.45±0.41m/s） race simulations. Conclusions: This study suggested that inwheelchair race, rate of velocity was key factor in 100m, whereas maintenance of forceout put was important in 400m. Higher performance was characterized as narrow rimrange power production in both 100m and 400m racers.

DECENTE SPORTS SCIENCE Vol.40/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE