Effects of endurance training and detraining on cardiac autonomic nervous system activity in young males

Jun Sugawara, Haruka Murakami, Shinya Kuno, Seiji Maeda, Tetsuji Kakiyama, Mitsuo Matsuda

研究成果: Article査読

抄録

The effects of endurance training and detraining on cardiac autonomic nervous system activity were studied by using the power spectral analysis of heart rate (HR) variability. Twenty-one sedentary male subjects were trained for 8 weeks using cycle ergometer exercise [70% of maximal oxygen uptake (V̇O2max), 60 min, 3∼4 times/wk]. Resting HR for 5 min was recorded before the training, after the 8-week training period, and after the 2-week and 4-week detraining period. The indices of cardiac parasympathetic and sympathetic nervous system activity were determined by Mem-Calc method, as the high frequency power (HF : 0.15∼0.50Hz) and the ratio of the low frequency power (LF : 0.04∼0.15 Hz) to the HF (LF/HF), respectively. The V̇O2max after the training and 4 weeks detraining period were significantly higher than the initial value (before training : 41±1 ml/kg/min; after training : 48±2, P<0.0001; after detraining : 46±2, P<0.001). The HF was significantly increased by the training (P<0.05), and maintained the increased level for the 2-week detraining period (before training : 6.4±0.3 In ms2; after training : 7.0±0.2, P<0.01; after 2-week detraining : 7.0±0.2, P<0.05). The increase in the HF, however, disappeared after the 4-week detraining period (6.8±0.31n ms2). The LF/HF did not show any significant changes during the training and detraining period. These results suggest that an endurance exercise with moderate intensity enhances cardiac parasympathetic nervous system activity, but not cardiac sympathetic nervous system activity. The enhanced cardiac parasympathetic nervous system activity, however, may regress rapidly during detraining period.

本文言語English
ページ(範囲)121-128
ページ数8
ジャーナルjapanese journal of physical fitness and sports medicine
49
1
DOI
出版ステータスPublished - 2000 2月
外部発表はい

ASJC Scopus subject areas

  • 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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