| Summary: | 碩士 === 國立臺灣師範大學 === 體育研究所 === 85 === The purpose of this study was to investigate: (1)the difference and relationship of critcial velocity (CV) derived from short-distance and long-distance front crawl swimming performance, (2)the relationships among CV derived from different distance front crawl performance combinations. Twenty-one trained swimmers with mean age, height and body weight of 21.1(SD=1.37)yrs, 168(SD=6.19)cm,and 64.2(SD=8.27)kg, respec-tively were studied. All subjects were instructed to swim six different distances (25m, 50m 100m, 200m, 400m, and 800m)at maximal effort twice. The CV and anaerobic swimming capacity (ASC)were obtained from four different combinations (CV251:25m, 50m and 100m; CV512:50m, 100m and 200m; CV248, CV25-800:25m, 50m, 100m, 200m, 400m and 800m). All subjects took progressively increased speed front crawl swimming test to measured heart rate threshold velocity (HRTV). The swimming velocities (mean±SD m/sec)among CV251, CV512, CV248, CV25-800 and HRTV were 1.37(0.18),1.19(0.19), 1.10(0.18), 1.13(0.18), and 1.17 (0.17)in order. There were significant correlation(r>0.87, P<0.01)among CV251, CV512, CV248 CV25-800 and HRTV. All CV''s and HRTV were significantly correlated to performance of all distances (P<0.01). Related t-test revealed that besides CV251, no significant differences among the CV''s and HRTV. Highest correlation (r=0.99) was found between CV248 and long-distances front crawl performance (400m and 800m).
In conclusion, coaches and swimmers can measure 50m, 100m and 200m front crawl performance to determine critical velocity in practice.
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