A 1-minute stabilization period for ECG-derived lnRMSSD in athletes showed near-perfect agreement (ICC 0.92-0.97) and trivial effect sizes compared to the traditional 5-minute criterion.
Cross-Sectional (n=20)
Does a 1-minute stabilization period provide equivalent HRV measurements compared to a traditional 5-minute stabilization period in athletes?
A 1-minute stabilization period is sufficient for accurate resting heart rate variability assessment in athletes, offering a more convenient data acquisition method.
Effect estimate: ES 0.07-0.12
Resting heart rate variability (HRV) is a potentially useful marker to consider for monitoring training status in athletes. However, traditional HRV data collection methodology requires a 5-min recording period preceded by a 5-min stabilization period. This lengthy process may limit HRV monitoring in the field due to time constraints and high compliance demands of athletes. Investigation into more practical methodology for HRV data acquisitions is required. The aim of this study was to determine the time course for stabilization of ECG-derived lnRMSSD from traditional HRV recordings. Ten-minute supine ECG measures were obtained in ten male and ten female collegiate cross-country athletes. The first 5 min for each ECG was separately analysed in successive 1-min intervals as follows: minutes 0-1 (lnRMSSD0-1 ), 1-2 (lnRMSSD1-2 ), 2-3 (lnRMSSD2-3 ), 3-4 (lnRMSSD3-4 ) and 4-5 (lnRMSSD4-5 ). Each 1-min lnRMSSD segment was then sequentially compared to lnRMSSD of the 5- to 10-min ECG segment, which was considered the criterion (lnRMSSDC riterion ). There were no significant differences between each 1-min lnRMSSD segment and lnRMSSDC riterion , and the effect sizes were considered trivial (ES ranged from 0·07 to 0·12). In addition, the ICC for each 1-min segment compared to the criterion was near perfect (ICC values ranged from 0·92 to 0·97). The limits of agreement between the prerecording values and lnRMSSDC riterion ranged from ±0·28 to ±0·45 ms. These results lend support to shorter, more convenient ECG recording procedures for lnRMSSD assessment in athletes by reducing the prerecording stabilization period to 1 min.
Flatt et al. (Mon,) conducted a cross-sectional in Healthy athletes (n=20). 1-minute ECG recording segments vs. 5- to 10-minute ECG segment (criterion) was evaluated on ECG-derived lnRMSSD from 1-min segments compared to 5- to 10-min criterion (ES 0.07-0.12). A 1-minute stabilization period for ECG-derived lnRMSSD in athletes showed near-perfect agreement (ICC 0.92-0.97) and trivial effect sizes compared to the traditional 5-minute criterion.
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