Football Science
Online ISSN : 1349-5623
13 巻
選択された号の論文の5件中1~5を表示しています
  • Heita Goto
    2016 年 13 巻 p. 1-8
    発行日: 2016年
    公開日: 2023/03/29
    ジャーナル フリー

    The aim of the current study was to examine an influence of high carbohydrate (CHO) pre-exercise meal with various glycaemic index (GI) on repeated sprint performance during a soccer match simulated prolonged high intensity intermittent running in trained adult female soccer players. This study was crossover design and eight trained female soccer players consumed isoenergetic high CHO meal with either high GI (HGI) (GI = 76) or low GI (LGI) (GI = 44) which provided 2 g CHO·kg-1 body mass 3 hours before performing the Loughborough Intermittent Shuttle Test (LIST). The test involved five 15-minute blocks and an open ended block which consisted of walking, jogging, cruising and 15 m sprint. Sprint time was significantly faster during the LGI trial than the HGI trial (HGI vs. LGI = 2.96 ± 0.06 s vs. 2.89 ± 0.06 s, p < 0.05). Heart rate (180 ± 2 beats·min-1 vs. 176 ± 3 beats·min-1, p < 0.05) and RPE (15.3 ± 1.8 vs. 14.2 ± 2.2, p < 0.05) were significantly lower during the LGI trial compared to the HGI trial. Therefore, female soccer players are advised to consume a high CHO meal with LGI before training or match.

  • Nobuyoshi Hirotsu, Kiyoshi Osawa, Yukihiro Aoba, Masafumi Yoshimura
    2016 年 13 巻 p. 9-25
    発行日: 2016年
    公開日: 2023/03/29
    ジャーナル フリー

    In this paper, J-league player performance was evaluated using data envelopment analysis (DEA) models to identify player characteristics from the standpoints of time played and player similarity. For this purpose, the concepts of scale efficiency and super efficiency were introduced to this study. Time played was used as the input and data from ten basic plays or actions such as goals, passes, dribbles and fouls, were used as the outputs. The performance of J-league field players was analyzed according to player position using data from the 2013 season based on the CCR (Charnes-Cooper-Rhodes) and BCC (Banker-Charnes-Cooper) models. Characteristics were discussed in reference not only to efficiency scores, but also scale efficiency and super efficiency scores. The suitability of player time on pitch was identified by scale efficiency with estimation of returns to scale. Efficient players were differentiated by super efficiency scores, and the relationship between efficient players was quantified with regard to the characteristics of plays in the position.

  • Tomoo Tsukoshi, Takeshi Asai
    2016 年 13 巻 p. 26-35
    発行日: 2016年
    公開日: 2023/03/29
    ジャーナル フリー

    We compared the physical and motor ability of youth soccer players in Japan, Korea, China, and Germany. Then, we clarified the physical characteristics of young Japanese players. We examined the physique, level of physical fitness, and motor ability of top-level young players from these countries using the following relatively common field test items in accordance with the Japan Football Association (JFA) Physical Measurement Guidelines (2006): body height, body weight, percent body fat, 10-m sprint, 30-m sprint, 50-m sprint, shuttle run (10 m × 5), vertical jump, standing 5-step jump, and Yo-Yo intermittent recovery test. Our main results were as follows: 1) Regarding physique (height, weight, and lean body mass), Japanese players showed the lowest values. 2) Japanese players achieved the fastest times in the 10-m sprint. Japanese players with lower height tended to perform better in 10-m sprints than in the other sprints. 3) Japanese players were the fastest in 10 m × 5 shuttle runs. Speed of Agility was one of the physical characteristics of Japanese players. 4) Players from the 4 countries showed no significant differences in the vertical jump.

  • Ryo Ogaki, Masahiro Takemura, Tatsuya Shimasaki, Miki Nariai, Satoshi ...
    2016 年 13 巻 p. 36-43
    発行日: 2016年
    公開日: 2023/03/29
    ジャーナル フリー

    This study was conducted to provide a muscle strength cutoff value for the assessment of shoulder injury risk in collegiate rugby union players. This prospective cohort study included 28 rugby union players. During the preseason period, five muscle strength tests were performed around both shoulder joints: one repetition maximum (1RM) bench press, 1RM shoulder press, internal rotational (IR), external rotational (ER) isometric muscle strength, and abductor (ABD) isometric muscle strength. Following the preseason tests, the occurrence of time-loss shoulder injury was recorded during the 2011–2012 season. The cutoff values for muscle strength test were determined by receiver operating characteristic curve analysis. Seven players sustained shoulder injuries during the season. The respective cutoff values for the preseason tests were as follows: 1RM bench press = 1.20 kg/body mass (area under the curve [AUC], 0.67; Sensitivity, 71.4%; Specificity, 61.9%), 1RM shoulder press = 0.70 kg/body mass (AUC, 0.69; Sensitivity, 51.7%; Specificity, 81.0%), IR = 2.80 N/ body mass (AUC, 0.64; Sensitivity, 92.9%; Specificity, 35.7%), ER = 2.60 N/body mass (AUC, 0.62; Sensitivity, 85.7%; Specificity, 38.1%), and ABD = 1.60 N/body mass (AUC, 0.69; Sensitivity, 85.7%; Specificity, 52.4%). Findings suggest that these cutoff values may be useful for preseason assessment of shoulder injury risk in collegiate rugby union players.

  • Shogo Sasaki, Yasuharu Nagano, Satoshi Kaneko, Hiroyuki Horino, Toru F ...
    2016 年 13 巻 p. 44-51
    発行日: 2016年
    公開日: 2023/03/29
    ジャーナル フリー

    Anthropometric and physical fitness characteristics are useful indicators for identifying talent in young soccer players. However, there is no information about anthropometric and physical fitness in Japanese prospective collegiate soccer players. The purpose of this study was to investigate the differences of anthropometric and physical fitness characteristics in the collegiate period between players who advanced to the professional league and those who did not. One hundred six male Japanese soccer players from one collegiate soccer team participated in this study. Nineteen of the 106 players were classified as “advanced” who had successfully signed a contract with a professional club. The remaining 87 “nonadvanced” players did not acquire a professional contact. Anthropometric (height, mass, body mass index, percent body fat, lean body mass and lean body mass relative to body height) and physical fitness (5-, 10-, 20-meter sprint and vertical jump) data were measured. Unpaired t-test and logistic regression method were used for analysis. The body height, body mass, body mass index, lean body mass, lean body mass relative to body height, and vertical jump performance were significantly different between advanced and nonadvanced players (p < 0.05). The lean body mass relative to body height and vertical jump height (OR ; 1.414, 1.134, respectively) exerted significant positive effects on advancement to the professional level, after adjusting for body height, percent body fat, and 10-m sprint speed. These findings suggest that each of lean body mass relative to body height and vertical jump ability can be one of the predictors for becoming a Japanese professional soccer player after college graduation.

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