Zhang Z, Zhang L, Wang S, Zheng J
Department of Aerospace Physiology, The Fourth Military Medical University, Xi'an, China.
Space Med Med Eng (Beijing). 1997 Oct;10(5):344-8.
To elucidate the effects of aerobic training on heart rate dynamics, heart rate variability (HRV) of eight students before and after a six-month aerobic training and HRV of six athletes, were analyzed with conventional time and frequency domain methods as well as with the approximate entropy(ApEn). The results showed that after a six-month aerobic training, heart rate ApEn significantly decreased (P < 0.01, P < 0.05) during both supine control and -6.67 kPa/30 min lower body negative pressure (LBNP). The heart rate ApEn of the athletes during supine control and early stage of LBNP testing was significantly lower (P < 0.01, P < 0.05) than that of the students before training. It was found that the values of ApEn were negatively correlated with the duration of LBNP in the student group (P < 0.01). However, both the time and frequency domain analyses were unable to detect the aforementioned changes. The results suggest that aerobic training can decrease the complexity of heart rate dynamics, and the synchronization in heart rate control during LBNP is probably a sustained process.
为阐明有氧运动训练对心率动态变化的影响，采用传统时域和频域方法以及近似熵（ApEn）对8名学生在进行为期6个月的有氧运动训练前后的心率变异性（HRV）以及6名运动员的HRV进行了分析。结果显示，经过6个月的有氧运动训练后，在仰卧位对照以及-6.67 kPa/30分钟下体负压（LBNP）期间，心率ApEn显著降低（P<0.01，P<0.05）。在仰卧位对照和LBNP测试早期，运动员的心率ApEn显著低于训练前学生的心率ApEn（P<0.01，P<0.05）。研究发现，学生组中ApEn值与LBNP持续时间呈负相关（P<0.01）。然而，时域和频域分析均未能检测到上述变化。结果表明，有氧运动训练可降低心率动态变化的复杂性，并且LBNP期间心率控制中的同步化可能是一个持续的过程。
