Department of Kinesiology, Human Performance Laboratory, James Madison University, Harrisonburg, Virginia, USA.
Clin Physiol Funct Imaging. 2022 Jul;42(4):292-299. doi: 10.1111/cpf.12760. Epub 2022 May 19.
The heart rate variability threshold (HRVT) is a clinical parameter used to gain insight into autonomic balance. Prior validation of the HRVT has been with cycle ergometry, with no studies examining the viability of treadmill exercise. The purpose of this study was to examine the reliability of the HRVT during treadmill exercise, and to compare the HRVT to the ventilatory threshold (VT). Ten healthy, college-aged males completed two maximal graded exercise tests on a treadmill. A Polar RS800CX watch was used for heart rate and HRVT data. The HRVT was determined from three HRV variables including the root mean square of successive differences of continuous R-R intervals (RMSSD), the standard deviation of normal R-R intervals (SDNN) and the standard deviation of instantaneous beat intervals (SD1). A metabolic cart was utilized to determine the VT. Results showed no difference between the HRVT (2.4 ± 0.6 and 2.2 ± 0.3 for RMSSD, 2.8 ± 0.5 and 2.7 ± 0.5 for SDNN and 2.4 ± 0.6 and 2.3 ± 0.6 for SD1) or the VT (3.0 ± 0.3 and 3.1 ± 0.3) between trials. When compared to the VT, averaged HRVT values for RMSSD (2.3 ± 0.3) and SD1 (2.3 ± 0.5) were lower than averaged VT (2.8 ± 0.4, p < 0.05). The averaged HRVT from SDNN (2.8 ± 0.5) did not differ from the VT. These results suggest that treadmill is a viable mode for HRVT determination, and that HRVT determined by SDNN may be a better comparison to the VT.
心率变异性阈值（HRVT）是一种用于深入了解自主平衡的临床参数。先前对 HRVT 的验证是在踏车运动中进行的，没有研究检查跑步机运动的可行性。本研究的目的是检查在跑步机运动期间 HRVT 的可靠性，并将 HRVT 与通气阈值（VT）进行比较。十名健康的大学生男性在跑步机上完成了两次最大递增运动测试。Polar RS800CX 手表用于心率和 HRVT 数据。HRVT 是通过三个 HRV 变量确定的，包括连续 R-R 间隔的均方根差（RMSSD）、正常 R-R 间隔的标准差（SDNN）和瞬时心跳间隔的标准差（SD1）。代谢箱用于确定 VT。结果表明，在 HRVT（RMSSD 的 2.4±0.6 和 2.2±0.3，SDNN 的 2.8±0.5 和 2.7±0.5，SD1 的 2.4±0.6 和 2.3±0.6）或 VT（3.0±0.3 和 3.1±0.3）之间，两次试验之间没有差异。与 VT 相比，RMSSD 的平均 HRVT 值（2.3±0.3）和 SD1（2.3±0.5）低于平均 VT（2.8±0.4，p<0.05）。SDNN 的平均 HRVT（2.8±0.5）与 VT 无差异。这些结果表明，跑步机是确定 HRVT 的可行模式，并且 SDNN 确定的 HRVT 可能与 VT 更好地比较。
