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Shiba, Junpei
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Social Sciences

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Changes of body composition in college female basketball players over approximately 6 months Shiba, Junpei; Yamase, Hana
International Journal of Basketball Studies Vol. 2 No. 2 (2023): INTERNATIONAL JOURNAL OF BASKETBALL STUDIES
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/ijobs.v2i2.6204

Abstract

This study aimed to examine changes in 1) body composition among female college basketball players over approximately 6 months and 2) body composition by player position. In all, 10 female college basketball players were included (age: 19.2 ± 1.0 years, height: 162.9 ± 4.6 cm, Guards: n=3, Forwards: n=4, Centers: n=3). Measurements were taken at the following timepoints: the beginning of the in-season (In1: June), the middle of the in-season (In2: August), and the end of the in-season (In3: October). The body mass, percentage of body fat, body fat mass, and lean body mass (LBM) were recorded and analyzed. Significant differences were reported in the percentages of body fat (p = 0.004), and a significant trend was observed in body fat mass values between time points (p = 0.096). Post-test results showed a significant decrease and small effect size between In1 and In2 (p = 0.041, d = -0.21) and a significant decreasing trend (effect size, trivial) (p = 0.096, d = -0.11) between In1 and In3 in percentage of body fat. No significant differences were reported in the body fat mass values between time points. Among guard players, there were moderate and large decreases in the percentages of body fat between In1 and In2 and between In1 and In3, respectively (d = -1.20, d = -1.86). Further, moderate and large decreases in body fat mass were observed between In1 and In2 and between In1 and In3, respectively (d = -1.07, d = -1.51). Among center players, LBM showed small decreases between In1 and In3 and between In2 and In3 (d = -0.56, d = -0.58). Thus, resistance training may be necessary to prevent a decrease in LBM.
Comparison of physical fitness characteristics of Japanese female basketball players by playing position and competition level Shiba, Junpei; Yamase, Hana
International Journal of Basketball Studies Vol. 2 No. 2 (2023): INTERNATIONAL JOURNAL OF BASKETBALL STUDIES
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/ijobs.v2i2.6370

Abstract

The purposes of this study were 1) to compare the physical fitness characteristics of Japanese female basketball players by position and 2) to compare the jumping ability of Japanese higher-competition and lower-competition level players. The subjects of this study were 13 Japanese female basketball players. The positions were categorized into three parts: guard for positions 1 and 2 (point guard and shooting guard), forward for positions 3 and 4 (shooting forward and power forward), and center for No. 5. The subjects were evaluated body mass, percentage of body fat, lean body mass, squat jump (SJ), countermovement jump (CMJ), rebound jump (RJ), 5m and 10m sprint, T-test, and 30-15 intermittent fitness test (30-15 IFT). This study was considered in the effect size (ES) due to the small sample size. The 90% confidence interval for ES of Hedge’s g was calculated to examine significant differences (p < 0.10). Guards were significantly higher SJ height and CMJ height than centers. Forwards had a significantly higher percentage of body fat than guards. Centers had significantly higher height, body mass, percentage of body fat, and lean body mass than guards. In addition, Centers had significantly higher lean body mass than forwards. Japanese seniors had significantly higher SJ height, CMJ height, and RJI than subjects of this study. Furthermore, Japanese U19 also had significantly higher SJ height, CMJ height, and RJI than the subjects of this study. This study showed that Japanese female basketball players differed in positional physical characteristics and competition-level jumping ability.
Co-Authors Yamase, Hana