Key result
The second heart-rate variability threshold (HRVTh2) is a good alternative to the heart-rate deflection point for assessing anaerobic threshold in trained boys, yielding similar VO2 and HR values.
Why the study?
Do the heart-rate deflection point (HRDP) and the second heart-rate variability threshold (HRVTh2) accurately predict anaerobic threshold compared to the second ventilatory threshold in trained boys?
Observational
Do the heart-rate deflection point (HRDP) and the second heart-rate variability threshold (HRVTh2) accurately predict anaerobic threshold compared to the second ventilatory threshold in trained boys?
The second heart-rate variability threshold (HRVTh2) is a valid alternative to the heart-rate deflection point for assessing anaerobic threshold during running exercise in trained boys.
May support noninvasive threshold estimation in boys; leaves open validation in larger pediatric cohorts before clinical adoption.
The aim of the present investigation was to compare the accuracy of the heart-rate (HR) deflection point (HRDP) and the second HR variability threshold (HRVTh2) to predict anaerobic threshold in boys. HRDP was determined from slope trends of successive linear regressions. HRVTh2 was determined from the high frequency's peak and power-density trends. The second ventilatory threshold (VTh2) corresponding to the first decrease in PETCO2, with an increase in VE /VCO2, was used as the reference measure of AnT. Results show that VO2 and HR were similar at HRDP, HRVTh2, and VTh2. HRVTh2 and HRDP were highly correlated. It appears that HRVTh2 is a good alternative to HRDP for assessing anaerobic threshold. HRVTh2 and HRDP might rely on similar mechanisms.
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Buchheit et al. (2007) conducted an observational in Healthy trained boys. Second heart-rate variability threshold (HRVTh2) vs. Heart-rate deflection point (HRDP) and second ventilatory threshold (VTh2) was evaluated on VO2 and HR at anaerobic threshold. The second heart-rate variability threshold (HRVTh2) is a good alternative to the heart-rate deflection point for assessing anaerobic threshold in trained boys, yielding similar VO2 and HR values.
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