<研究論文>若年スポーツ選手の心拍数変動Power Spectral analysisによる自律神経機能の評価(I) Evaluation of sympathetic and parasympathetic activities in young athletes using power spectral analysis of the heart rate variability
Power spectral analysis of heart rate variability was used to evaluate the cardiac sympathetic and parasympathetic activities in 6 young athletes and 6 age-matched control non-athletes. All examinees underwent Holter monitoring. Low frequency density reading (LF, 0.04-0.15 Hz), high frequency density reading (HF, 0.15-0.40 Hz) and a LF/HF ratio were obtained from the power spectral analysis of heart rate variability in Holter monitoring. HF density and LF/HF ratio indicate the parasympathetic and sympathetic activities, respectively. HF density was siqnificantly higher in athletes than in non-athletes throughout a 24 hour period. The values (on a log scale) are 2.82±0.28 vs 2.32±0.26 msec^2/Hz in the afternoon, 3.46±0.54 vs 2.93±0.39 msec^2/Hz at night and 2.83±0.39 vs 2.36±0.64 msec^2/Hz in the morning, p<0.01 in each. In contrast, LF/HF ratio was higher in non-athletes than in athletes [athletes vs non-athletes; 3.24±0.48 vs 5.12±0.72 in the afternoon (p<0.05), 0.65±0.10 vs 1.14±0.18 at night (p<0.05) and 3.00±0.47 vs 4.34±0.99 in the morning (NS)]. Consequently, power spectral analysis of heart rate variability, a new method in evaluating separately cardiac sympathetic and parasympathetic activities, showed that young athletes had higher parasympathetic and lower sympathetic tone than age-matched non-athletes throughout a day.
東海大学スポーツ医科学雑誌 5, 44-49, 1993-03-05