Muscle cross-sectional area by magnetic resonance imaging, and muscle strength, were measured in the alpine skier into elite alpine skier group (Elite ALP) and non elite alpine skier group (ALP) to evaluate the muscle morphological and functional characteristics compared with healthy man group (CONT). In muscle cross-sectional area of quadriceps and hamstrings were not statistically significant differences at 70, 50, 30%, position. Isokinetics strength of knee extention and flexion were measured at 30, 90 and 180 degree per second. There was statistically significant high difference in control group at 90 and 180 degree per second (p<0.05). Furthermore, calculated to strength torque per unit muscle Cross-Sectional area (peak torque / muscle Cross-Sectional area: call for specific tension) 30, 50, 70% position at knee extension by 180 degree per second. Specific tension was significantly higher Elite ALP than CONT by 50% position (p<0.05). In addition, specific tension were higher Elite ALP and ALP than CONT by 70% position (p<0.05). However, there was significant difference in Elite ALP and ALP about specific tension. In conclusion, there were no significant difference of the among three groups by the muscle cross-sectional area in each position. However, alpine ski racer’s muscle functional characteristic was admitted in specific tension in a high-velocity range of motion. It might be a result of the origin as this factor from the development of the muscle fiber area by the muscle fiber composition and described as a neural factor.
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