Key result
ECG-derived respiration and HRV accurately assess VT2 during field shuttle run tests.
Why the study?
The authors evaluated ECG-derived respiration and the high frequency product of heart rate variability as methods to assess the second ventilatory threshold.
Do ECG-derived respiration and high frequency product of heart rate variability reliably assess the second ventilatory threshold compared to ventilatory equivalents in healthy young soccer players?
Observational (n=15)
Do ECG-derived respiration and high frequency product of heart rate variability reliably assess the second ventilatory threshold compared to ventilatory equivalents in healthy young soccer players?
High frequency product and ECG-derived respiration are reliable heart rate variability indices for determining the second ventilatory threshold in a field shuttle run test.
Many studies have focused on heart rate variability in association with ventilatory thresholds. The purpose of the current study was to consider the ECG-derived respiration and the high frequency product of heart rate variability as applicable methods to assess the second ventilatory threshold (VT2). Fifteen healthy young soccer players participated in the study. Respiratory gases and ECGs were collected during an incremental laboratory test and in a multistage shuttle run test until exhaustion. VΤ2 was individually calculated using the deflection point of ventilatory equivalents. In addition, VT2 was assessed both by the deflection point of ECG-derived respiration and high frequency product. Results showed no statistically significant differences between VT2, and the threshold as determined with high frequency product and ECG-derived respiration (F(2,28)=0.83, p=0.45, η2=0.05). A significant intraclass correlation was observed for ECG-derived respiration (r=0.94) and high frequency product (r=0.95) with VT2. Similarly, Bland Altman analysis showed a considerable agreement between VT2 vs. ECG-derived respiration (mean difference of −0.06 km·h−1, 95% CL: ±0.40) and VT2 vs. high frequency product (mean difference of 0.02 km·h−1, 95% CL: ±0.38). This study suggests that, high frequency product and ECG-derived respiration are indeed reliable heart rate variability indices determining VT2 in a field shuttle run test
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Stergiopoulos et al. (2020) conducted an observational in Healthy young soccer players (n=15). ECG-derived respiration and high frequency product of heart rate variability vs. Second ventilatory threshold (VT2) calculated using ventilatory equivalents was evaluated on Second ventilatory threshold (VT2) (r=0.94 and r=0.95, p=0.45). ECG-derived respiration and the high frequency product of heart rate variability accurately assessed the second ventilatory threshold in a field shuttle run test (r=0.94 and r=0.95, respectively).
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