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Heart rate variability to assess ventilatory threshold in ski-mountaineering
Johan Cassirame1, Nicolas Tordi2,3, Nicolas Fabre4
1a EA 4660 Culture Sport Health Society, Exercise, Performance, Health, Innovation Platform , University of Franche-Comté , Besançon , France.
European Journal of Sport Science
|September 18, 2014
Summary
Heart rate variability (HRV) effectively predicts heart rate and speed at the second ventilatory threshold (VT2) during ski-mountaineering tests. This method aids skiers in evaluating and controlling training loads.
Area of Science:
- Sports Science
- Physiology
- Exercise Science
Background:
- Ventilatory thresholds (VT1 and VT2) are crucial physiological markers in endurance sports.
- Accurate determination of these thresholds is vital for effective training load prescription.
Purpose of the Study:
- To evaluate the capacity of heart rate variability (HRV) to predict heart rate (HR) and speed at VT1 and VT2 during an incremental ski-mountaineering test.
- To compare HRV-derived thresholds with those determined by gas exchange analysis.
Main Methods:
- Nine skiers underwent an incremental ski-mountaineering test to exhaustion.
- VT1 and VT2 were determined using visual gas exchange analysis (VT1V, VT2V) and time-varying spectral HRV analysis (VT1fH, VT2fH, VT2H).
Main Results:
- VT1 could not be determined using the employed HRV methods.
- VT2 was successfully determined in all participants using HRV.
- No significant differences were found in HR and speed at VT2 between HRV and gas exchange methods (VT2H vs. VT2V).
- Strong correlations (r=0.91 for HR, r=0.92 for speed) and small limits of agreement were observed for VT2.
Conclusions:
- HRV analysis is a valid method for determining VT2 during ski-mountaineering incremental tests.
- This finding offers practical applications for skiers to monitor and manage training intensity.
- HRV provides a reliable tool for assessing physiological responses during specific endurance activities.
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