The smartphone application and chest strap provided perfect correlation (r=1.0; P=.00) with ECG for all heart-rate variability indexes, demonstrating excellent compliance.
Cross-Sectional (n=31)
Does a smartphone application and chest strap accurately record R-R intervals compared to ECG in male recreational runners?
The HRV Expert smartphone app combined with a Polar H10 chest strap provides highly accurate R-R interval recordings comparable to ECG in resting athletes.
Effect estimate: r = 1.0
p-value: p=.00
OBJECTIVE: To evaluate the accuracy of the smartphone application (app) HRV Expert (CardioMood) and a chest strap (H10 Polar) for recording R-R intervals compared with electrocardiogram (ECG). METHODS: A total of 31 male recreational runners (age 36.1 6.3 y) volunteered for this study. R-R intervals were recorded simultaneously by the smartphone app and ECG for 5 minutes to analyze heart-rate variability in both the supine and sitting positions. Time-domain indexes (heart rate, mean R-R, SD of RR intervals, count of successive normal R-R intervals differing by more than 50 ms, percentage of successive normal R-R intervals differing by more than 50 ms, and root mean square of successive differences between normal R-R intervals), frequency-domain indexes (low frequency, normalized low frequency, high frequency, normalized high frequency, low-frequency to high-frequency ratio, and very low frequency), and nonlinear indexes (SD of instantaneous beat-to-beat variability and long-term SD of continuous R-R intervals) were compared by unpaired t test, Pearson correlation, simple linear regression, and Bland-Altman plot to evaluate the agreement between the devices. RESULTS: High similarity with P value varying between .97 and 1.0 in both positions was found. The correlation coefficient of the heart-rate-variability indexes was perfect (r = 1.0; P = .00) for all variables. The constant error, standard error of estimation, and limits of agreement between ECG and the smartphone app were considered small. CONCLUSION: The smartphone app and chest strap provide excellent ECG compliance for all variables in the time domain, frequency domain, and nonlinear indexes, regardless of the assessed position. Therefore, the smartphone app replaces ECG for any heart-rate-variability analysis in runners.
Pereira et al. (Thu,) conducted a cross-sectional in Recreational runners (n=31). Smartphone application (HRV Expert) and chest strap (H10 Polar) vs. Electrocardiogram (ECG) was evaluated on Agreement of R-R intervals and heart-rate variability indexes (r = 1.0, p=.00). The smartphone application and chest strap provided perfect correlation (r=1.0; P=.00) with ECG for all heart-rate variability indexes, demonstrating excellent compliance.