D'Agosto T, Peçanha T, Bartels R, Moreira D N, Silva L P, Nóbrega A C L, Lima J R P
Laboratory of Motor Assessment, Faculty of Physical Education and Sports, Federal University of Juiz de Fora, Minas Gerais, Brazil.
Exercise Hemodynamic Laboratory, School of Physical Education and Sport, University of São Paulo, Sao Paulo, Brazil.
Int J Sports Med. 2014 Sep;35(10):879-85. doi: 10.1055/s-0034-1370911. Epub 2014 Apr 15.
Analyzes of cardiac autonomic responses at the initial transient of exercise have been used for the investigation of the cardiovascular health. We evaluated the influence of aerobic fitness on HR and HRV responses at the onset of exercise. 25 male subjects (22.3±2.4 years) were divided into 2 groups: 'low aerobic fitness' (36.2±2.6ml.kg(-1).min(-1); n=10) and 'high aerobic fitness' (46.4±5.0ml.kg(-1).min(-1); n=15). The experimental session consisted of assessing the beat-to-beat HR at rest and during submaximal exercise. The autonomic responses at the onset of exercise were calculated by fitting the HR and HRV (rMSSD-index) curves during the initial 300s of exercise into a first-order exponential equation. The time constant of HR and of the rMSSD index (τonHR and τonrMSSD) were calculated for analysis. We observed lower values of τonrMSSD in the high aerobic fitness group compared to the low aerobic fitness group (26.8±5s vs. 38.0±18s, respectively; p=0.02). The τonHR (42.0±15 vs. 49.3±26s, p=0.38) for the groups showed no difference. Aerobic fitness partially influenced the autonomic responses during exercise, since individuals with higher fitness showed faster decreases in beat-to-beat HRV at the onset of exercise.
对运动初始瞬态时心脏自主神经反应的分析已被用于心血管健康的研究。我们评估了有氧适能对运动开始时心率（HR）和心率变异性（HRV）反应的影响。25名男性受试者（22.3±2.4岁）被分为两组：“低有氧适能”组（36.2±2.6ml·kg⁻¹·min⁻¹；n = 10）和“高有氧适能”组（46.4±5.0ml·kg⁻¹·min⁻¹；n = 15）。实验环节包括评估静息时和次最大运动期间的逐搏心率。通过将运动最初300秒内的心率和心率变异性（rMSSD指数）曲线拟合为一阶指数方程来计算运动开始时的自主神经反应。计算心率和rMSSD指数的时间常数（τonHR和τonrMSSD）用于分析。我们观察到，与低有氧适能组相比，高有氧适能组的τonrMSSD值更低（分别为26.8±5秒和38.0±18秒；p = 0.02）。两组的τonHR（42.0±15秒对49.3±26秒，p = 0.38）无差异。有氧适能对运动期间的自主神经反应有部分影响，因为适能较高的个体在运动开始时逐搏心率变异性下降更快。
