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 ( 2019 ) 18 , 751 - 757

Research article
Longitudinal Age-Related Morphological and Physiological Changes in Adolescent Male Basketball Players
Yuta Sekine1,2,3, , Seigo Hoshikawa4, Norikazu Hirose5
Author Information
1 Faculty of Modern Life, Teikyo Heisei University, Tokyo, Japan
2 Graduate School of Sport Sciences, Waseda University, Saitama, Japan
3 Department of Health Science, Daito Bunka University, Saitama, Japan
4 Faculty of Sociology, Edogawa University, Chiba, Japan
5 Faculty of Sport Sciences, Waseda University, Saitama, Japan

Yuta Sekine
✉ Faculty of Modern Life, Teikyo Heisei University, 4-21-2, Nakano, Nakano-ku, Tokyo 164-8530, Japan
Email: y.sekine@thu.ac.jp
Publish Date
Received: 26-03-2019
Accepted: 18-10-2019
Published (online): 01-12-2019
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ABSTRACT

This study aimed to examine longitudinal age-related changes in muscle morphology and jump and sprint performances of youth athletes. The subjects of this longitudinal study were 41 youth male basketball players who were assigned to late, mid, and early groups based on differences regarding the estimated age at peak height velocity. The vastus medialis, vastus intermedius, rectus femoris, vastus lateralis, biceps brachii, and triceps brachii thicknesses were assessed using ultrasonography. The subjects’ anaerobic capacities were evaluated based on Abalakov jumps and 20-m sprint time. After 1 year, the vastus medialis and biceps brachii thicknesses increased significantly in all groups, and the rectus femoris, vastus intermedius, and vastus lateralis thicknesses increased significantly in the late and mid groups, but not in the early group. The Abalakov jumps and 20-m sprint time improved significantly in all groups. The early group’s 10-m sprint time improved significantly. Cross-sectional comparisons showed that after 1 year, the early group’s Abalakov jumps and 20-m sprint time at baseline, its Abalakov jumps, and 10-m and 20-m sprint times were significantly better than those in the mid and late groups. Hence, significant muscle growth occurred before the athletes reached the age at peak height velocity. During puberty, late maturers’ sprint times and jump performances may not catch up with those of early maturers. The speed and tempo of the morphological growth and anaerobic ability of athletes in the same age category depend on athletes’ biological maturity.

Key words: Puberty, biological maturity, muscle, peak height velocity, anaerobic ability


           Key Points
  • Significant muscle growth occurred before the age at peak height velocity was reached.
  • Puberty is the critical phase to develop the anaerobic abilities (e.g., sprint time, jump height).
  • Individuals who matured early might possess anaerobic abilities compared to their peers, and this advantage is not catch up during Japanese junior high school (12-15 years) although they were in the same age category.
 
 
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