RR-PO-1062

Monday 12:30, Palau de Congressos, Exhibition Hall  [Display No. 400]

THE RELATIONSHIP BETWEEN MUSCLE MASS MEASURED BY MULTIFREQUENCY BIOELECTRICAL IMPEDANCE ANALYSIS AND MUSCLE STRENGTH IN HIGH-SCHOOL ATHLETES. Miura M, Kawaguchi T, Yoshioka T ; Department of Physical Therapy, Aomori University of Health and Welfare, Aomori, Japan. PURPOSE: In providing physical therapy, understanding the body composition of the patient is considered to be one of the most important evaluation. Above all, for an athlete who is aiming to return to competitive activity, the percent body fat is an important that reflects his/her physical condition. In particular, athletes who need weight loss provide the best example. The purpose of this study was to clarify the relationship between muscle mass  by adding thorough verification with multifrequency bioelectrical impedance analysis and muscle strength, and the relationship between physical measurements including height, body weight and muscle strength. METHODS: The subjects were 95 high-school athletes (39 baseball players, 38 handball players and 18 judoists). All of them were male. We measured height, body weight and body mass index (BMI) as physical measurements, and lean body mass (LBM) and muscle mass of the upper and lower extremities as a body composition. The measuring device used was a multifrequency bioelectrical impedance analyzer (InBody 2.0, Biospace Co. Ltd., Seoul, Korea). Grip strength was measured as muscle strength of the upper extremity, and the peak torque of knee extensors as muscle strength of the lower extremity. Correlation between each data obtained from physical measurements and body composition, and grip strength and the peak torque of knee extensors,  were studied. RESULTS: The mean height was 171.1 ± 5.4 cm ( mean ± S. D. ) , body weight 66.1 ± 8.7 kg, BMI 22.7 ± 2.9 and LBM 57.0 ± 5.5 kg. The mean muscle mass of the right upper extremity was 2.4 ± 0.3 liters (L), that of the left upper extremity 2.4 ± 0.3 L, that of the right lower extremity 6.5 ± 0.7 L and that of the left lower extremity 6.5 ± 0.7 L. The results showed that body weight and LBM have strong correlation with muscle strength and that muscle mass of the upper extremity has a significant correlation with grip strength.  A significant correlation between muscle mass of the lower extremity and the peak torque of knee extensors was also observed, but not very strong. CONCLUSION: It was confirmed that high-school athletes are characterized by the strong correlation between the body weight or LBM and the muscle strength, and that the muscle mass does not always exhibit strong correlation with the muscle strength.