Abstract
The study purpose was estimation of the accuracy of RR time series measurements by SHC “Rytm” and validity of derived heart rate variability (HRV) indexes under physical loads and recovery period.
 Materials and methods. The participants were 20 healthy male adults aged 19.7 ± 0.23 years. Data was recorded simultaneously with CardioLab CE12, Polar RS800, and SHC “Rytm”. Test protocol included a 2 minute step test (20 steps per minute, platform height – 40 cm) with the next 3 minute recovery period. HRV indexes were calculated by Kubios HRV 2.1.
 Results. The RR data bias in the case of physical loads was -0.06 ms, it increased to 0.09-0.33 ms during the recovery period. The limits of agreement for RR data ranged from 3.7 ms to 22.8 ms, depending on the period of measurements and pair of compared devices. It is acceptable for the heart rate and HRV estimation. The intraclass correlation coefficients (0.62–1.00) and Spearman correlation coefficient (0.99) were high enough to suggest very high repeatability of the data. We found no significant difference (p > 0.05) and good correlation (r = 0.94-1.00) between the majority of HRV indexes, calculated from data of Polar RS800 and SHC “Rytm” in conditions of physical loads (except for LF/HF ratio) and in the recovery period. The only one index (RMSSD) was different (p < 0.05) in case of Polar RS800 and SHC “Rytm” data, obtained in the recovery period. The largest numbers of different HRV indexes have been found during the comparison of CardioLab CE12 and Polar RS800 – RMSSD, pNN50, and SD1. Correlation between HRV indexes (r = 0.81-1.00) was very high in all pairs of devices in all periods of measurements.
 Conclusions. The SHC “Rytm” appears to be acceptable for RR intervals registration and the HRV analysis during physical loads and recovery period.
Highlights
To date, the emphasis of many studies is placed on the study of changes in functions of the human organism in stress conditions – diseases, emergency situations, competitive and training activities
We found no significant difference (p > 0.05) and good correlation (r = 0.94-1.00) between the majority of heart rate variability (HRV) indexes, calculated from data of Polar RS800 and SHC “Rytm” in conditions of physical loads and in the recovery period
The largest numbers of different HRV indexes have been found during the comparison of CardioLab CE12 and Polar RS800 – RMSSD, pNN50, and SD1
Summary
The emphasis of many studies is placed on the study of changes in functions of the human organism in stress conditions – diseases, emergency situations, competitive and training activities. These researches aimed at monitoring the indexes of the loads’ intensity to track the time course of training adaptation or illness progression in order to avoid pathological changes. The devices of remote (telemetry) control of the physiological functions are used (Dunn et al, 2018) Such devices are in many cases based on the monitoring of heart rate and other parameters of the cardiovascular system, which could be used as indica-. The remote monitoring of HRV, combined with the evaluation of main indexes of the cardiovascular system, is of great benefit and offers a possibility of greatly improve the level of physical loads and ТМФВ, 2021, том 21, No 1
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