Adverse effects of energy restriction on myogenic enzymes in judoists

Takashi Umeda, Shigeyuki Nakaji, Tadashi Shimoyama, Youske Yamamoto, Manabu Totsuka, Kazuo Sugawara

研究成果: ジャーナルへの寄稿学術論文査読

48 被引用数 (Scopus)

抄録

In this study, we examined the effects of weight reduction by restricting energy intake on muscle function and serum concentrations of myogenic enzymes in judoists. Twenty-seven male judoists aged 19.3 ± 0.6 years (mean±s) were divided into three groups based on the extent of body weight reduction: high weight reduction (height 1.70 ± 0.05 m, body mass 78.5 ± 13.6 kg), low weight reduction (height 1.70 ± 0.05 m, body mass 80.7 ± 13.1 kg) and a group that maintained body weight while continuing to perform exercise training (height 1.78 ± 0.07 m, body mass 78.7 ± 8.8 kg). Body composition, blood biochemistry, energy intake and anaerobic power were assessed on four occasions: 20 days (baseline data), 4 days and 1 day before and 7 days after competition. Compared with baseline, body mass and fat-free mass were significantly lower 1 day before competition in the high and low weight reduction groups (both P < 0.01); these changes persisted for 7 days after competition in the high weight reduction group. Serum creatine kinase was significantly elevated 1 day before competition in all groups (all P <0.05), and remained higher 7 days after competition in both the high and low weight reduction groups. Compared with baseline, maximal anaerobic power was significantly lower 1 day before competition only in the high weight reduction group (P < 0.01). Our results suggest that energy restriction in addition to intense exercise training before major competition has an adverse effect on anaerobic power and elevates serum creatine kinase concentration, leading to an impairment of muscular function and an increased susceptibility of muscle tissue to injury.

本文言語英語
ページ(範囲)329-338
ページ数10
ジャーナルJournal of Sports Sciences
22
4
DOI
出版ステータス出版済み - 04-2004
外部発表はい

All Science Journal Classification (ASJC) codes

  • 整形外科およびスポーツ医学
  • 理学療法、スポーツ療法とリハビリテーション

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