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長時間一定負荷運動時の心拍ドリフトと自律神経活動の関係
連, 長順;有光, 琢磨;山中, 亮;アフルンデ, ロガイエ;白川, 和希;小田, 史郎;柚木, 孝敬;矢野, 徳郎
Permalink : http://hdl.handle.net/2115/56424
JaLCDOI : 10.14943/b.edu.120.45
KEYWORDS : 長時間運動;心拍数;交感神経活動;副交感神経活動;Prolonged exercise;Heart rate;Sympathetic nerve activity;Parasympathetic nerve activity
Abstract
本研究では，長時間一定負荷運動時に観察される心拍数（HR）の漸増現象（HR drift）と心臓自律神経活動の関連性を検討するため，7 名の健常男子大学生を対象に自転車エルゴメーターを用いて60 分の長時間一定負荷運動テストを実施した。自律神経活動はHR 変動を周波数分析することによって評価した。長時間一定負荷運動の前半（3-30 分）においては，HR driftの発生は交感神経活動に関連せず，副交感神経活動に一部関連していると考えられた。運動の後半（30-60 分）におけるHR drift は自律神経活動によって説明できず，運動ストレスなどの因子と関連する可能性が考えられた。
The aim of this study was to determine the relationship between heart rate (HR) drift and cardiac autonomic nerve activity during constant-load prolonged exercise. Seven healthy men performed a moderate-intensity (about 60% of peak oxygen uptake) 60-min cycling exercise. Autonomic nerve activity was evaluated by the frequency analysis of HR variability. The powers of high frequency (HF, 0.15-0.4 Hz), low frequency (LF, 0.04-0.15 Hz) and LF to HF ratio (LF/HF) components of HR Variability (HRV) have been shown to estimate cardiac vagal and sympathetic activities. The results showed that HR was rapidly increased from (67 ± 8 bpm) to (131 ± 14 bpm) at the 3rd minute after start from the state of rest (Fig. 2, P<0.05), thereafter, at the first half of the exercise (the 30th minute：146±17 bpm) and the end of the exercise (the 60th minute： 156±13 bpm), where HR was both increased significantly (Fig. 2, P<0.05) . Although the LF/HF showed the tendency (0.05<P=0.087<0.1) to increase from the state of rest (2.90±1.96) to the 3rd minute of exercise (9.35±6.54), after that, it did not show any change at the 30th (9.94±5.24) minute and the end of the exercise (4.99±4.50) (Fig. 2) . The HF was rapidly decreased after 3-minute exercise from the state of rest； at rest： 521.28 ± 307.11 (beats/min) 2/Hz； the 3rd minute： 56.57 ± 45.63 (beats/min) 2/Hz, P<0.05) . Although it showed significantly decreased from 3rd minute to the 30th minute of exercise (0.88±1.12 (beats/min) 2/Hz (P<0.05), HF did not show statistically significant change from the 30th minute to the end of the exercise (0.51 ±0.55 (beats/min) 2/Hz, 0.05<P=0.094<0.1) . The HR drift in the first half of the exercise (3-30 min) was considered not to be related to sympathetic activity, but related to parasympathetic nerve activity. In the last half exercise (30-60 min), the HR drift seemed to be independent of the autonomic nervous activity.
The aim of this study was to determine the relationship between heart rate (HR) drift and cardiac autonomic nerve activity during constant-load prolonged exercise. Seven healthy men performed a moderate-intensity (about 60% of peak oxygen uptake) 60-min cycling exercise. Autonomic nerve activity was evaluated by the frequency analysis of HR variability. The powers of high frequency (HF, 0.15-0.4 Hz), low frequency (LF, 0.04-0.15 Hz) and LF to HF ratio (LF/HF) components of HR Variability (HRV) have been shown to estimate cardiac vagal and sympathetic activities. The results showed that HR was rapidly increased from (67 ± 8 bpm) to (131 ± 14 bpm) at the 3rd minute after start from the state of rest (Fig. 2, P<0.05), thereafter, at the first half of the exercise (the 30th minute：146±17 bpm) and the end of the exercise (the 60th minute： 156±13 bpm), where HR was both increased significantly (Fig. 2, P<0.05) . Although the LF/HF showed the tendency (0.05<P=0.087<0.1) to increase from the state of rest (2.90±1.96) to the 3rd minute of exercise (9.35±6.54), after that, it did not show any change at the 30th (9.94±5.24) minute and the end of the exercise (4.99±4.50) (Fig. 2) . The HF was rapidly decreased after 3-minute exercise from the state of rest； at rest： 521.28 ± 307.11 (beats/min) 2/Hz； the 3rd minute： 56.57 ± 45.63 (beats/min) 2/Hz, P<0.05) . Although it showed significantly decreased from 3rd minute to the 30th minute of exercise (0.88±1.12 (beats/min) 2/Hz (P<0.05), HF did not show statistically significant change from the 30th minute to the end of the exercise (0.51 ±0.55 (beats/min) 2/Hz, 0.05<P=0.094<0.1) . The HR drift in the first half of the exercise (3-30 min) was considered not to be related to sympathetic activity, but related to parasympathetic nerve activity. In the last half exercise (30-60 min), the HR drift seemed to be independent of the autonomic nervous activity.
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