Abstract
Background: Heart rate variability (HRV) is an autonomic nervous system marker that provides reliable information for both disease prevention and diagnosis; it is also used in sport settings. We examined the validity of the Polar RS800CX heart rate monitor during rest, moderate cycling, and recovery in considering the total of 24 HRV indices. Method: A total of 32 healthy males (age=24.78±6.87 years, body mass index=24.48±3.13 kg/m2) completed a session comprised by three 20-minute time periods of resting, cycling at 60% of maximal heart rate, and recovery using a Polar RS800CX and an electrocardiogram (ECG) monitors. The HRV indices included time-domain, frequency-domain, Poincaré plot and recurrence plot. Bland–Altman plot analysis was used to estimate agreement between Polar RS800CX and ECG. Results: We detected significant associations (r>0.75, p<0.05) in all HRV indices, while five out of 24 HRV indices displayed significant mean differences (p<0.05) between Polar RS800CX and ECG during the resting period. However, for the exercise and recovery periods, we found significant mean differences (p<0.05) in 16/24 and 22/24 HRV indices between the two monitors, respectively. Conclusion: It is concluded that Polar RS800CX is a valid tool for monitoring HRV in individuals at resting conditions, but it displays inconsistency when used during exercise at 60% of maximal heart rate and recovery periods.
Highlights
Variations in successive heart rate (HR) and RR intervals [the peak of the Q, R, and S waves of the electrocardiogram (ECG)] simultaneously are described as heart rate variability (HRV), which is the conventionally accepted term to portray variations of RR intervals[1]
The aim of the current study was to assess the validity of Polar RS800CX in a large spectrum of Heart rate variability (HRV) parameters by comparing it with a 12-lead ECG monitor during rest, moderate cycling and recovery
We found that all the HRV indices (n=24) based on Polar RS800CX are correlated, while only five HRV indices displayed mean differences with the ECG HRV indices during the resting period
Summary
Variations in successive heart rate (HR) and RR intervals [the peak of the Q, R, and S waves of the electrocardiogram (ECG)] simultaneously are described as heart rate variability (HRV), which is the conventionally accepted term to portray variations of RR intervals[1]. The wide use of HRV in both clinical and basic research as a diagnostic criterion has resulted in increased production of HRV-related equipment and software Reference gold standard such as Power Lab (AD Instruments, Australia) and Reynolds Pathfinder program (Reynolds Medical Limited, United Kingdom) were developed and used extensively when compared with other HR monitors (i.e. Polar)[17]. The purpose of this study was to assess the validity of Polar RS800CX in a large spectrum of HRV indices by comparing it with results gained using an ECG monitor during rest, exercise (cycling) and recovery. Conclusion: It is concluded that Polar RS800CX is a valid tool for monitoring HRV in individuals at resting conditions, but it displays inconsistency when used during exercise at 60% of maximal heart rate and recovery periods
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