Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2013) 12, 60 - 65

Research article
Effects of Body Mass-Based Squat Training in Adolescent Boys
Yohei Takai , Yuko Fukunaga, Eiji Fujita, Hisashi Mori, Takaya Yoshimoto, Masayoshi Yamamoto, Hiroaki Kanehisa
Author Information
National Institute of Fitness and Sports in Kanoya, Kagoshima, Japan

Yohei Takai
✉ National Institute of Fitness and Sports in Kanoya, 1 Shiromizu, Kanoya, Kagoshima, Japan, 8912393
Email: y-takai@nifs-k.ac.jp
Publish Date
Received: 18-08-2012
Accepted: 16-11-2012
Published (online): 01-03-2013
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ABSTRACT

The purpose of this study was to determine the effects of body mass-based squat training on body composition, muscular strength and motor fitness in adolescent boys. Ninety-four boys (13.7 ± 0.6 yrs, 1.60 ± 0.09 m, 50.2 ± 9.6 kg) participated in this study and were randomly assigned to training (n = 36) or control (n = 58) groups. The training group completed body mass-based squat exercise training (100 reps/day, 45 sessions) for 8 weeks. Body composition and muscle thickness at the thigh anterior were determined by a bioelectrical impedance analyzer and ultrasound apparatus, respectively. Maximal voluntary knee extension strength and sprint velocity were measured using static myometer and non-motorized treadmill, respectively. Jump height was calculated using flight time during jumping, which was measured by a matswitch system. The 8-wk body mass-based squat training significantly decreased percent body fat (4.2%) and significantly increased the lean body mass (2.7%), muscle thickness (3.2%) and strength of the knee extensors (16.0%), compared to control group. The vertical jump height was also significantly improved by 3.4% through the intervention. The current results indicate that body mass-based squat training for 8 weeks is a feasible and effective method for improving body composition and muscular strength of the knee extensors, and jump performance in adolescent boys.

Key words: School-based training, force-generating capacity, motor fitness, adolescents.


           Key Points
  • An 8-wk body mass-based squat exercise training decreased percent body fat in adolescent boys.
  • The body mass-based squat exercise training increased muscle size and strength capability of the knee extensors in adolescent boys.
  • The squat exercise training improves vertical jump height in adolescent boys.
 
 
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