Moraes Íbis A P, Silva Talita D, Massetti Thais, Menezes Lilian D C, Ribeiro Vivian F, Tropiano Ligia M C C, Barnabé Viviani, Hoshi Rosangela A, Monteiro Carlos B M, Fernandes Marcelo
Graduate Program in Rehabilitation Sciences of the School of Medicine, University of São Paulo - USP, São Paulo, Brazil.
Department of Physical Therapy, Mackenzie Presbyterian University, São Paulo, Brazil.
Cardiol Young. 2019 Oct;29(10):1236-1242. doi: 10.1017/S1047951119001793. Epub 2019 Sep 2.
Changes in cardiac autonomic regulation, expressed by increased sympathetic activity and decreased heart rate variability, have an important relationship with the onset of lethal cardiac phenomena. Therefore, we aimed to evaluate the cardiac autonomic behaviour in young people according to their level of physical activity. Through the International Physical Activity Questionnaire, 55 healthy young non-smokers with no history of previous diseases and whose parents did not suffer from metabolic syndrome were assessed and divided into groups: sedentary (n=12), insufficiently active (n=16), active (n=14), and very active (n=13). We collected respiratory rate, systolic and diastolic blood pressure at rest, and body mass index. Subjects remained supine at rest, and without mental stress for 15 minutes in a controlled environment. Using a cardiofrequency meter (Polar® RS800CX), data were analysed in the time domain, frequency domain, and detrended fluctuation analysis. For the sedentary group, the mean RR and rMSSD were significantly lower, and the insufficiently active group showed higher means, but significantly only for rMSSD. The insufficiently active group showed in the detrended fluctuation analysis that α2 was significantly lower compared with the sedentary, active, and very active groups. We conclude that young, healthy, sedentary individuals present an increased heart rate and that insufficiently active individuals present a decreased fractal correlation and increased parasympathetic activity.
心脏自主神经调节的变化表现为交感神经活动增加和心率变异性降低，与致命性心脏现象的发生密切相关。因此，我们旨在根据年轻人的身体活动水平评估其心脏自主神经行为。通过国际体力活动问卷，对55名健康的年轻非吸烟者进行了评估，他们没有既往疾病史，且父母未患代谢综合征，并将其分为几组：久坐不动组（n = 12）、活动不足组（n = 16）、活动组（n = 14）和非常活跃组（n = 13）。我们收集了静息时的呼吸频率、收缩压和舒张压以及体重指数。受试者在安静环境中仰卧休息15分钟，无精神压力。使用心率计（Polar® RS800CX），在时域、频域和去趋势波动分析中对数据进行分析。对于久坐不动组，平均RR和rMSSD显著较低，活动不足组的平均值较高，但仅rMSSD显著。在去趋势波动分析中，活动不足组的α2与久坐不动组、活动组和非常活跃组相比显著较低。我们得出结论，年轻、健康、久坐不动的个体心率增加，活动不足的个体分形相关性降低且副交感神经活动增加。
