The heart rate increase necessary to halve heart rate variability during exercise was inversely correlated with maximum oxygen consumption (r = -0.60), indicating faster HRV decrease in fitter athletes.
Observational (n=18)
No
Does the decrease of heart rate variability as a function of heart rate during exercise correlate with cardiorespiratory fitness in adolescent athletes?
The decrease of heart rate variability as a function of heart rate during exercise is faster among athletes with better cardiorespiratory fitness, providing a potential index for fitness assessment using portable cardiac devices.
Effect estimate: r = -0.60
p-value: p=0.006
The present study proposes to measure and quantify the heart rate variability (HRV) changes during effort as a function of the heart rate and to test the capacity of the produced indices to predict cardiorespiratory fitness measures. Therefore, the beat-to-beat cardiac time interval series of 18 adolescent athletes (15.2 ± 2.0 years) measured during maximal graded effort test were detrended using a dynamical first-order differential equation model. HRV was then calculated as the standard deviation of the detrended RR intervals (SDRR) within successive windows of one minute. The variation of this measure of HRV during exercise is properly fitted by an exponential decrease of the heart rate: the SDRR is divided by 2 every increase of heart rate of 20 beats/min. The HR increase necessary to divide by 2 the HRV is linearly inversely correlated with the maximum oxygen consumption (r = -0.60, p = 0.006), the maximal aerobic power (r = -0.62, p = 0.006), and, to a lesser extent, to the power at the ventilatory thresholds (r = -0.53, p = 0.02 and r = -0.47, p = 0.05 for the first and second threshold). It indicates that the decrease of the HRV when the heart rate increases is faster among athletes with better fitness. This analysis, based only on cardiac measurements, provides a promising tool for the study of cardiac measurements generated by portable devices.
Mongin et al. (2022) conducted an observational in Healthy adolescent athletes (n=18). Maximal graded effort test was evaluated on Correlation between HRV decay constant and maximum oxygen consumption (VO2max) (r = -0.60, p=0.006). The heart rate increase necessary to halve heart rate variability during exercise was inversely correlated with maximum oxygen consumption (r = -0.60), indicating faster HRV decrease in fitter athletes.