Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
 
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Journal of Sports Science and Medicine
ISSN: 1303 - 2968
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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

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

Received:
18-08-2012 -- Accepted: 16-11-2012 --
Published (online): 01-03-2013

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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