Evaluation of Meteorological Factors' Effect on Daily Heart Rate Variability Over Five Years.

The aim of this study is to investigate the effect of meteorological factors on heart rate variability (HRV) derived from daily electrocardiogram (ECG) data. Daily meteorological data were obtained from the Japan Meteorological Agency’s database. Daily ECG data were measured while bathing for five years. The subject was a healthy male in his fifties. After collecting ECG data, R-R intervals were calculated to perform HRV analysis in time domain and frequency domain. The evaluation of link between meteorological factors and HRV parameters was realized by utilizing meteorological factors’ importance calculated by Random Forest, and Steel-Dwass significant difference analysis of the values. Additionally, the evaluation was also performed by analyzing the obtained meteorological factors’ importance values using Granger Causality test. In Steel-Dwass test, several significant differences (p<0.05) were found, especially the importance value of air temperature was significantly different in three HRV parameters. I n Granger Causality test, we evaluate the temperature’s importance value for three HRV parameters, and there were significant differences (p<0.05) for HF and LF/HF.