Key result
Decreasing cross-correlation coefficients of stroke volume and heart rate variability during incremental exercise can identify the aerobic capability plateau (p<0.05).
Why the study?
Intensive sporting activities can induce potential myocardial injury during the aerobic capability plateau, motivating the identification of indicators to distinguish stages of incremental physical load.
Can time- and frequency-domain analysis of stroke volume variability and heart rate variability distinguish different stages of physical load during incremental exercise?
Observational
Can time- and frequency-domain analysis of stroke volume variability and heart rate variability distinguish different stages of physical load during incremental exercise?
p-value: p=<0.05
Decreasing correlation between stroke volume variability and heart rate variability can indicate when the body reaches the aerobic capability plateau, potentially guiding exercise intensity to prevent myocardial injury.
May identify aerobic plateau via declining stroke volume–heart rate variability correlation; hypothesis-generating and requires prospective validation.
A potential myocardial injury can be induced by intensive sporting activities, which may be due to ventricular tachycardia or fibrillation when individuals continue to exercise during the maximum physical loading period (the aerobic capability plateau, ACP). Herein, we conducted an incremental exercise test with the RR-interval and SV-series measurements as the input and output of the circulatory system. Through time and frequency analyses, we aimed to identify the indicators for distinguishing the normal stage (S1), last stage before ACP (S2), and ACP stage (S3) during different incremental physical loads. The cross-correlation results of the RR interval and SV series showed that the maximum coefficient of S2 was significantly greater (p < 0.05) than that of S1 (median 0.91 to 0.87), and also significantly lower (p < 0.05) than that of S3 (median 0.87 to 0.60). The corresponding spectrum shows that the decreasing correlation coefficient of SVV and Heart rate variability can be used to assess whether the body has reached the ACP. These findings can be used as a guide for exercise healthcare. Pausing or reducing the exercise load before entering the ACP could effectively reduce the risk of myocardial injury.
No takes yet. Share an insight, caveat, or question.
Lai et al. (2022) conducted an observational in Physical load during exercise. Incremental physical load (indoor cycling) vs. Different stages of physical load (S1, S2, S3) was evaluated on Cross-correlation coefficient of RR interval and SV series (p=<0.05). Decreasing cross-correlation coefficients of stroke volume and heart rate variability during incremental exercise can identify the aerobic capability plateau (p<0.05).
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: