Validity and Reliability of Two Smartphone Applications on Heart Rate Variability in Healthy Subjects

บทคัดย่อ

Heart rate variability (HRV) parameters represent the body's autonomic activity. The approach to obtaining these parameters needs special equipment. Interestingly, smartphone applications (apps) have recently become more friendly. With Polar H10, Elite app has good validity and reliability. HRVlogger is another fascinating app with more sophisticated in functionality. This study aims to determine the validity and reliability between Elite HRV and HRV logger application implementing the same chest strap, Polar H10, on heart rate variability parameters in healthy subjects. Twenty-six healthy adults performed three consecutive five-minute HRV recordings with one minute rest in both app during sitting. There were three correlations with the highest strength, natural log of the root mean square of successive differences between normal heartbeats (LnRMSSD) (r = 0.95, p-value < 0.01), the percentage of adjacent normal to normal intervals that differ from each other by more than 50 ms (pNN50), (r = 0.94, p-value < 0.01), and RR interval (r = 0.93, p-value < 0.01). The excellent correlation was root mean square of successive differences between normal heartbeats (RMSSD), heart rate (HR), and standard deviations of all the NN intervals (SDNN). The values were 0.88, 0.86, and 0.84, respectively (p-value < 0.01). Moreover, the low frequency/high frequency (LF/HF) ratio had moderate correlation (r = 0.59, p-value < 0.01). Reliability was excellent. RMSSD is 0.93 (0.84, 0.97), LnRMSSD is 0.97 (0.94, 0.99), HR is 0.97 (0.94, 0.99), RR interval is 0.97 (0.92, 0.94), SDNN is 0.90 (0.78, 0.96), and pNN50 is 0.94 (0.87, 0.97). The LF/HF ratio is poor to moderate, 0.38 (-0.39,0.72). HRV logger has moderate to excellent validity and reliability.