School of Physical Education and Sport, Exercise Hemodynamic -Laboratory, University of São Paulo, Brazil.
Faculty of Physical Education and Sports, Federal University of Juiz de Fora, Brazil.
Int J Sports Med. 2014 Mar;35(3):245-52. doi: 10.1055/s-0033-1349873. Epub 2013 Aug 2.
Most studies regarding the impact of exercise intensity on cardiac autonomic regulation were conducted with athletes and used exercise intensities exceeding those recommended by position stands. We evaluated the influence of exercise intensity in a typical ACSM-aerobic session on 24-h cardiac autonomic modulation in sedentary subjects. Ten healthy sedentary subjects participated in the 3-day study. On 2 days, subjects performed a moderate- or high-intensity aerobic exercise session (MI, HI). The post-exercise protocol consisted of a continuous electrocardiographic recording for 1 h at the laboratory plus 23 h under ambulatory conditions. On the third day 24-h electrocardiographic recording was done without prior exercise (NPE). Heart rate (HR) and frequency-domain parameters (LF, HF) of heart rate variability were evaluated during the entire recovery period. Higher values of HR and lower values of HF and LF were observed throughout the first hour after the HI compared with the MI session. This difference was not observed after in ambulatory awake condition, but reappeared during sleep, when HF values after HI were lower compared with the NPE and MI (p<0.05). Even within the submaximal intensity-range of a typical exercise session, the intensity of exercise influences the post-exercise cardiac autonomic modulation in sedentary subjects.
大多数关于运动强度对心脏自主调节影响的研究都是在运动员中进行的，并且使用的运动强度超过了体位立场所建议的强度。我们评估了在典型的 ACSM 有氧运动课程中运动强度对久坐受试者 24 小时心脏自主调节的影响。10 名健康的久坐受试者参加了为期 3 天的研究。在 2 天的时间里，受试者进行了中等强度或高强度的有氧运动（MI、HI）。运动后的方案包括在实验室连续记录 1 小时的心电图和 23 小时的动态条件下的心电图记录。第三天，在没有预先运动的情况下进行 24 小时心电图记录（NPE）。在整个恢复期评估心率（HR）和心率变异性的频域参数（LF、HF）。与 MI 相比，HI 后第一个小时内观察到 HR 较高，HF 和 LF 较低。在清醒的活动状态下，这种差异并不明显，但在睡眠时再次出现，HI 后的 HF 值比 NPE 和 MI 低（p<0.05）。即使在典型运动课程的亚最大强度范围内，运动强度也会影响久坐受试者的运动后心脏自主调节。
