Changes in heart rate variability with respect to exercise intensity and time during treadmill running.
Changes in heart rate variability with respect to exercise intensity and time during treadmill running.
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DOI：
10.1186/s12938-018-0561-x
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发表时间：
2018-09-24
影响因子：
3.9
通讯作者：
Saengsuwan J
中科院分区：
文献类型：
--
作者：
Hunt KJ;Saengsuwan J
心率变异性 (HRV) 是由心率的交感神经和副交感神经自主调节的复杂相互作用产生的。 HRV 的超低频 (ULF) 和极低频 (VLF) 分量在自动 HR 控制器中发挥着至关重要的作用，但迄今为止，这些频段在 HRV 研究中基本上被忽略。这项工作的目的是研究跑步机跑步期间 ULF 和 VLF 心率变异性随运动强度和时间的变化。 RR 间隔是通过 21 名健康男性参与者在休息时以及中等和高强度跑步机跑步期间的心电图确定的；这三项测试均持续 45 分钟。通过将恒速阶段划分为三个持续时间相等（14 分钟）的连续窗口（表示为 和 ），研究了中等和剧烈跑步强度的 HRV 时间依赖性。 ULF 和 VLF 功率使用 Lomb-Scargle 功率谱密度估计进行计算。对于 ULF 和 VLF 频段，静息、中等和剧烈强度水平之间的平均功率存在显着差异（总体）：中等强度与静息强度水平 ()、剧烈强度与静息强度水平 () 以及剧烈强度与中等强度水平 () 的平均功率较低。对于 ULF 和 VLF 以及中等强度，三个时间窗口之间的平均功率存在显着差异（ULF 总体、VLF 总体）：对于 ULF，相对于 () 和相对于 () 的平均功率较低；对于 VLF，平均功率低于 ()。对于 ULF 和剧烈强度，三个时间窗口之间的平均功率没有显着差异（总体而言）。对于 VLF 和剧烈强度， 和 之间的平均功率显着不同（总体而言）：与 () 相比，与 () 相比，平均功率较低。研究发现，以 ULF 和 VLF 功率表示的 HRV 程度随着运动强度的增加而降低。还观察到心率变异性随着时间的推移而降低，但仍有待澄清这些变化是由于时间本身还是与心血管漂移相关的心率增加所致。对于反馈控制应用，应重点关注在低强度和运动早期阶段达到表现目标。
Heart rate variability (HRV) arises from the complex interplay of sympathetic and parasympathetic autonomic regulation of heart rate. Ultra-low frequency (ULF) and very-low frequency (VLF) components of HRV play a crucial role in automatic HR controllers, but these frequency bands have hitherto largely been neglected in HRV studies. The aim of this work was to investigate changes in ULF and VLF heart rate variability with respect to exercise intensity and time during treadmill running. RR intervals were determined by ECG in 21 healthy male participants at rest, and during moderate and vigorous-intensity treadmill running; each of these three tests had a duration of 45 min. Time dependence of HRV was investigated for moderate and vigorous running intensities by dividing the constant-speed stages into three consecutive windows of equal duration ( 14 min), denoted , and . ULF and VLF power were computed using Lomb-Scargle power spectral density estimates. For both the ULF and VLF frequency bands, mean power was significantly different between the resting, moderate and vigorous intensity levels (overall ): mean power was lower for moderate vs. rest (), for vigorous vs. rest (), and for vigorous vs. moderate (). For both ULF and VLF and moderate intensity, mean power was significantly different between the three time windows (overall for ULF, overall for VLF): for ULF, mean power was lower for vs. () and for vs. (); for VLF, mean power was lower for vs. (). For ULF and vigorous intensity, there was no significant difference in mean power between the three time windows (overall ). For VLF and vigorous intensity, mean power was significantly different between , and (overall ): mean power was lower for vs. () and for vs. (). The degree of HRV in terms of ULF and VLF power was found to decrease with increasing intensity of exercise. HRV was also observed to decrease over time, but it remains to clarify whether these changes are due to time itself or to increases in HR related to cardiovascular drift. For feedback control applications, attention should be focused on meeting performance targets at low intensity and during the early stages of exercise.
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影响因子：
3.3
作者：
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通讯作者：
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