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Jumping performance, isometric force and muscle characteristics in non athletic young men

Abstract:

Five male students of physical education, (age range 22-26 years) volunteered as subjects for examination of standing-long jump (SLJ), countermovement jump (CMJ), squat jump (SJ), maximal voluntary bilateral isometric force, force-time characteristics and distribution of muscle fiber types. Height and distance attained in the SLJ, SJ and CMJ were (mean±SD) 2.53±0.17m, 0.32±0.05m and 0.40±0.05m, respectively. No significant correlation was found between fiber type I, IIA and IIB (48%±1, 34%±3, 16%±4) and jumping performance, or between maximal isometric force or maximal rate of force development with height and distance of the jump. Maximal isometric leg extension force and maximal rate of ferce development were greater in the maximal isometric test at a knee flexion of 120° (2268N±576 and 8962N/sec±1945 respectively) than at a knee flexion of 90° (1538N±300 and 7398N/sec±1557). The correlation coefficient between both vertical jumps (SJ and CMJ) and SLJ was very high (r=0.96; p<0.05; r=0.97; p<0.05, respectively). However, no significant correlation was found between maximal isometric force and dynamic explosive force production. The present results suggest that in young subjects no significant correlation existed between the dynamic and explosive and/or isometric actions with muscle fiber distribution. Also the knee angle at which the isometric test is made had an influence on the relationship between isometric force measures characterizing muscular function and the dynamic performance itself. © 1998 Teviot Scientific Publications.