Journal of Scientific Coaching for Training
Online ISSN : 2434-3307
Print ISSN : 2433-6742
Current issue
Journal of Scientific Coaching for Training VOL.4 NO.1
Displaying 1-2 of 2 articles from this issue
  • Motohiko Kimura, Aizawa Katsuji, Eiji Watanabe, Mitsuru Satoh, Takaaki ...
    2021 Volume 4 Issue 1 Pages 3-9
    Published: 2021
    Released on J-STAGE: December 20, 2021
    JOURNAL FREE ACCESS
    This study aimed to reveal developmental characteristics of physical fitness on the height of male wrestler of an elementary school by using a biological index from the viewpoint of growth and development. A total of 291 male wrestlers in an elementary school were assessed. Measurement items included students’ height and weight, their basic physical fitness assessed using a 20-m sprint, standing long jump, side steps, and rebound jump (RJ) index and that of wrestling ability was tackle jump. These items, along with the height, were plotted on a logarithmic graph to obtain the allometric equation “y = bxa.” Index “a” of the 20-m sprint were 0.927. Index “a” of standing long jump, side steps, and RJ were 1.434, 1.815 and 2.093 respectively. Index “a” of tackle jump were 1.685. Considering the transition points, the 20-m sprint recognized transition point in about 118 cm in height. In case of standing long jump, side steps, RJ index and tackle jump, the transition point was recognized in about 143cm in height. The basic physical fitness and wrestling ability increased with the growth in height. The main results obtained were as follows. 1. Instantaneous jumping power to forward, quickness, and tackle follow the same developmental process. 2. Instantaneous jumping power to forward, quickness, and tackle continue to develop just before the adolescent peak.
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  • Takaaki MISHIMA, Eiji WATANABE
    2021 Volume 4 Issue 1 Pages 10-18
    Published: 2021
    Released on J-STAGE: December 20, 2021
    JOURNAL FREE ACCESS
    This study was made to investigate the relationship between the growth of body height and the development of speed, change of direction, explosiveness and quickness in girls from childhood to adolescence. 2,552 active girls aged from 4- to 15-year-old were tested in this study. Motor abilities that indicated speed, change of direction, explosiveness and quickness were assessed with 20 m dash velocity, Pro Agility test velocity, standing long jump, side steps, vertical jump and rebound jump index. To obtain the allometric equation “y = bxa”, record of motor abilities was plotted on a logarithmic graph along with body height. When the transition point was not taken into account, the values of coefficient “a” of the 20 m dash velocity, Pro Agility test velocity, standing long jump, side steps, vertical jump and rebound jump index were 0.923, 0.874, 1.619, 2.032, 1.598 and 1.921, respectively. When the transition point was taken into account, it was shown as a two-phase linear function with one transition point in each measurement item. However, the value of coefficient “a” up to the transition point exceeded value of coefficient “a” from the transition point in all motor abilities. In addition, body height at the transition point ranged from 122.1 cm to 128.3 cm. Results of this study suggested that speed, change of direction, explosiveness and quickness develop markedly up to a height of about 125 cm, but later develop slowly.
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