Vanderlei L C M, Silva R A, Pastre C M, Azevedo F M, Godoy M F
Departamento de Fisioterapia, Universidade Estadual Paulista, Presidente Prudente, SP, Brasil.
Braz J Med Biol Res. 2008 Oct;41(10):854-9. doi: 10.1590/s0100-879x2008005000039. Epub 2008 Sep 30.
The aim of the present study was to compare heart rate variability (HRV) at rest and during exercise using a temporal series obtained with the Polar S810i monitor and a signal from a LYNX(R) signal conditioner (BIO EMG 1000 model) with a channel configured for the acquisition of ECG signals. Fifteen healthy subjects aged 20.9 +/- 1.4 years were analyzed. The subjects remained at rest for 20 min and performed exercise for another 20 min with the workload selected to achieve 60% of submaximal heart rate. RR series were obtained for each individual with a Polar S810i instrument and with an ECG analyzed with a biological signal conditioner. The HRV indices (rMSSD, pNN50, LFnu, HFnu, and LF/HF) were calculated after signal processing and analysis. The unpaired Student t-test and intraclass correlation coefficient were used for data analysis. No statistically significant differences were observed when comparing the values analyzed by means of the two devices for HRV at rest and during exercise. The intraclass correlation coefficient demonstrated satisfactory correlation between the values obtained by the devices at rest (pNN50 = 0.994; rMSSD = 0.995; LFnu = 0.978; HFnu = 0.978; LF/HF = 0.982) and during exercise (pNN50 = 0.869; rMSSD = 0.929; LFnu = 0.973; HFnu = 0.973; LF/HF = 0.942). The calculation of HRV values by means of temporal series obtained from the Polar S810i instrument appears to be as reliable as those obtained by processing the ECG signal captured with a signal conditioner.
本研究的目的是使用通过Polar S810i监测仪获得的时间序列以及来自LYNX(R)信号调节器（BIO EMG 1000型号）且配置了用于采集心电图信号通道的信号，比较静息和运动期间的心率变异性（HRV）。分析了15名年龄为20.9±1.4岁的健康受试者。受试者静息20分钟，然后进行20分钟运动，运动负荷选择为达到次最大心率的60%。使用Polar S810i仪器为每个个体获取RR序列，并使用生物信号调节器分析心电图。在信号处理和分析后计算HRV指标（rMSSD、pNN50、LFnu、HFnu和LF/HF）。使用非配对学生t检验和组内相关系数进行数据分析。在比较通过两种设备分析得到的静息和运动期间HRV值时，未观察到统计学上的显著差异。组内相关系数表明，两种设备在静息时（pNN50 = 0.994；rMSSD = 0.995；LFnu = 0.978；HFnu = 0.978；LF/HF = 0.982）和运动期间（pNN50 = 0.869；rMSSD = 0.929；LFnu = 0.973；HFnu = 0.973；LF/HF = 0.942）获得的值之间具有良好的相关性。通过Polar S810i仪器获得的时间序列计算HRV值似乎与通过处理信号调节器捕获的心电图信号获得的值一样可靠。
