Maturity-associated variation in physique, body composition and physical fitness of youth baseball players Hong-Sun Song 1, Kwang-Jun Kim 1, Ki-Hyuk L

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1 Maturity-associated variation in physique, body composition and physical fitness of youth baseball players Hong-Sun Song 1, Kwang-Jun Kim 1, Ki-Hyuk Lee 2, Peng Zhao 3, Buong-O Chun 4 * 1 Korea Institute of Sport Science, 2 Center for Sport Science in Jeju, 3 Beijing Sport University, & 4 Kyung Hee University [Purpose] [Methods] [Results] [Conclusions] Key words:

3 Table 1. Characteristics of the Subjects Variable Chronological age (CA, month) Skeletal age (SA, month) SA minus CA (month) All (n=112) Primary school (n=49) Middle school (n=63) 154.2± ± ± ± ± ± ± ± ±4.8 Height (cm) 162.0± ± ±7.9 Weight (kg) 57.6± ± ±12.4 BMI (kg/m 2 ) 21.6± ± ±3.4

5 Table 2. Mean scores ± SD for chronological age, skeletal age, anthropometric, and frequencies of skeletal maturity status unit Grade 4 (n=16) Primary school (n=49) Grade 5 (n=16) Grade 6 (n=17) Grade 7 (n=30) Middle school (n=63) Grade 8 (n=23) Grade 9 (n=10) Chronological age (CA) month 123.9± ± ± ± ± ±4.4 Skeletal age (SA) month 135.7± ± ± ± ± ±2.8 SA minus CA month 11.7± ± ± ± ± ±4.46 Height cm 148.6± ± ± ± ± ±3.9 Weight kg 46.2± ± ± ± ± ±8.5 BMI kg/m ± ± ± ± ± ±2.8 Skeletal maturity status f f f f f f Late On-time Early Table 3. Anthropometric profiles of primary school and middle school baseball players classified as on time and early in skeletal maturation unit On-time (n=40) Primary school Early (n=9) p On-time (n=59) Middle school Early (n=4) Skeletal age (SA) year 12.2± ± ± ± Anthropometric & Body composition Height cm 152.8± ± ± ± Weight kg 46.9± ± ± ± Arm span cm 154.9± ± ± ± Thigh volume cm 48.4± ± ± ± Fat mass % 21.4± ± ± ± Muscle mass % 75.5± ± ± ± p

6 Table 4. Physical fitness profiles of primary school and middle school baseball players classified as on time and early in skeletal maturation unit On-time (n=40) Primary school Early (n=9) p On-time (n=59) Middle school Early (n=4) Skeletal age (SA) year 12.2± ± ± ± Muscle Strength Elbow extension strength kg 15.9± ± ± ± Knee extension strength kg 38.2± ± ± ± Back strength kg 65.6± ± ± ± Grip strength kg 25.1± ± ± ± Sit-up n/60s 42.1± ± ± ± Power Vertical jump cm 35.1± ± ± ± Agility Reaction time (sound) 1/1000s.271± ± ± ± Side-steps n/20s 43.6± ± ± ± Flexebility & Coordination Sit and reach cm 7.2± ± ± ± T-wall test n 107.6± ± ± ± Anaerobic Power Avg. Power w/kg 4.4± ± ± ± Power Drop % 63.9± ± ± ± Peak Power w/kg 6.0± ± ± ± Aerobic Power Shuttle run n 45.1± ± ± ± p

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Kinematic analysis of success strategy of YANG Hak Seon technique Joo-Ho Song 1, Jong-Hoon Park 2, & Jin-Sun Kim 3 * 1 Korea Institute of Sport Scienc

Kinematic analysis of success strategy of technique JooHo Song 1, JongHoon Park 2, & JinSun Kim 3 * 1 Korea Institute of Sport Science, 2 Catholic Kwandong University, 3 Yonsei University [Purpose] [Methods]