PDF(Pubmed)
Abstract：
BACKGROUND: Athletes in certain sports aim to gain an advantage by competing in a lower body mass class instead of competing in their own body mass class. This study aims to reveal certain physiologic and strength changes in elite male boxers who lost body mass rapidly before the competition.
METHODS: 30 thirty boxers who were aged between 19-24 years and having a mean age of 7.4 years participated in the study. To evaluate the effect of short-term dietary intake interventions on body composition and muscle strength before the competition, boxers were divided into three groups: control (C), exercise+diet1 (E+D1) and exercise+diet2 (E+D2) groups. The dietary habits of the participants were controlled and they participated in the training program. The data of the study consisted of variables such as body mass, height, regional muscle mass, body fat percentage, biceps and femur bicondylar circumference measurements before the competitions. Isometric strength measurements of knee extensors and flexors and shoulder internal and external rotators were also recorded.
RESULTS: Physiologic parameters such as body mass change, BMI level, body fat percentage and leg muscle ratios of E+D2 were significantly decreased compared to C and E+D1 groups. Furthermore, submaximal and maximal strength production in knee extensors and flexors as well as shoulder internal and external rotators were significantly decreased in E+D2 compared to C and E+D1 groups.
CONCLUSIONS: The tendency to lose body mass quickly in a short of time may give the desired results in terms of BMI, body mass and fat percentage, but it may cause strength losses in boxers during the competition period.
METHODS: 30 thirty boxers who were aged between 19-24 years and having a mean age of 7.4 years participated in the study. To evaluate the effect of short-term dietary intake interventions on body composition and muscle strength before the competition, boxers were divided into three groups: control (C), exercise+diet1 (E+D1) and exercise+diet2 (E+D2) groups. The dietary habits of the participants were controlled and they participated in the training program. The data of the study consisted of variables such as body mass, height, regional muscle mass, body fat percentage, biceps and femur bicondylar circumference measurements before the competitions. Isometric strength measurements of knee extensors and flexors and shoulder internal and external rotators were also recorded.
RESULTS: Physiologic parameters such as body mass change, BMI level, body fat percentage and leg muscle ratios of E+D2 were significantly decreased compared to C and E+D1 groups. Furthermore, submaximal and maximal strength production in knee extensors and flexors as well as shoulder internal and external rotators were significantly decreased in E+D2 compared to C and E+D1 groups.
CONCLUSIONS: The tendency to lose body mass quickly in a short of time may give the desired results in terms of BMI, body mass and fat percentage, but it may cause strength losses in boxers during the competition period.
摘要：
背景：某些运动中的运动员旨在通过在较低的体重等级中竞争而不是在自己的体重等级中竞争来获得优势。这项研究旨在揭示在比赛前体重迅速下降的精英男性拳击手的某些生理和力量变化。
方法：30名年龄在19-24岁之间，平均年龄为7.4岁的拳击手参加了这项研究。评估短期饮食摄入干预对赛前身体成分和肌肉力量的影响，拳击手分为三组：对照组(C)，运动+饮食1(E+D1)和运动+饮食2(E+D2)组。参与者的饮食习惯得到控制，他们参加了培训计划。研究的数据包括体重等变量，高度,局部肌肉质量，身体脂肪百分比，比赛前测量二头肌和股骨双髁围。还记录了膝盖伸肌和屈肌以及肩部内部和外部旋转器的等距强度测量值。
结果：生理参数，如体重变化，BMI水平,与C和ED1组相比，ED2组的体脂百分比和腿部肌肉比率显着降低。此外，与C和ED1组相比，ED2组的膝关节伸肌和屈肌以及肩部内部和外部旋转肌的次最大和最大强度产生显着降低。
结论：在短时间内快速失去体重的趋势可能会在BMI方面产生预期的结果，体重和脂肪百分比，但这可能会导致拳击手在比赛期间的力量损失。
方法：30名年龄在19-24岁之间，平均年龄为7.4岁的拳击手参加了这项研究。评估短期饮食摄入干预对赛前身体成分和肌肉力量的影响，拳击手分为三组：对照组(C)，运动+饮食1(E+D1)和运动+饮食2(E+D2)组。参与者的饮食习惯得到控制，他们参加了培训计划。研究的数据包括体重等变量，高度,局部肌肉质量，身体脂肪百分比，比赛前测量二头肌和股骨双髁围。还记录了膝盖伸肌和屈肌以及肩部内部和外部旋转器的等距强度测量值。
结果：生理参数，如体重变化，BMI水平,与C和ED1组相比，ED2组的体脂百分比和腿部肌肉比率显着降低。此外，与C和ED1组相比，ED2组的膝关节伸肌和屈肌以及肩部内部和外部旋转肌的次最大和最大强度产生显着降低。
结论：在短时间内快速失去体重的趋势可能会在BMI方面产生预期的结果，体重和脂肪百分比，但这可能会导致拳击手在比赛期间的力量损失。
