Abstract
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.
Highlights
The World Health Organization (WHO) defines physical activity as any bodily movement produced by skeletal muscles, which requires energy expenditure
The results were expressed as the percentage, with which all parameters were going to a maximum of 100%, and showed that the HR, stroke volume (SV), and cardiac output (CO) were increased during incremental exercise, with SV increasing during the initial stage
We suggest that SV variability (SVV) is related to heart rate variability (HRV), SVV and HRV are reflected in the autonomic nervous system (ANS) in different bandwidths and phases
Summary
The World Health Organization (WHO) defines physical activity as any bodily movement produced by skeletal muscles, which requires energy expenditure. The term “exercise” should not be mistaken with “physical activity”. It is a subcategory of physical activity that is planned, structured, repetitive, and purposeful, in the sense that the objective is to maintain one or multiple components of physical fitness. In Taiwan, the Sports Administration, Ministry of Education, have announced several plans to promote exercise for general citizens since 1997. A study published in 2006 reported that 37% of men and 24% of women in the United Kingdom performed 30 min of moderate exercise five times a week [1]. In 2010, a study in Spain reported that the overall prevalence of men and women who actively played sports was 52.12% and 33.27%, respectively [2]. Exercise has become an increasingly popular trend in recent years, and cardiovascular response to exercise has become an interesting topic of research
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
