Key result
Living high-training low in hypoxic rooms increased VO2 and power at the respiratory compensation point by 7.5% and 5.0%, respectively, in Nordic-skiers.
Why the study?
Does living high-training low alter aerobic capacities and heart rate variability in Nordic-skiers compared to living low-training low?
Does living high-training low alter aerobic capacities and heart rate variability in Nordic-skiers compared to living low-training low?
Changes in heart rate variability correlate with changes in aerobic capacity during altitude training, suggesting HRV is a useful tool for monitoring training adaptations.
LHTL in hypoxic rooms was associated with improved aerobic thresholds in Nordic skiers; hypothesis-generating and requires RCT confirmation.
We analyzed the relationship between aerobic capacities and changes in heart rate variability (HRV) in Nordic-skiers during living high-training low (Hi-Lo). Eleven skiers trained for 18 days at 1200 m, sleeping at 1200 m (LL, n = 5) or in hypoxic rooms (HL, n = 6, 3 x 6 days at altitudes of 2500 - 3000 - 3500 m, 11 h . day (-1)). Measurements were performed before, during and two weeks after Hi-Lo. VO(2max), peak power output were not improved in HL nor in LL, whereas VO(2) and power at the respiratory compensation point (VO(2RCP) and PRCP) increased by 7.5 % and 5.0 % only in HL. Significant changes in HRV occurred only in LL, in the standing position, including a 30 % (p < 0.05) increase in resting heart rate (HR), a 50 % (p < 0.05) decrease in total spectral power (TP) and a 77 % (p < 0.05) decrease in high frequency activity (HF). When all the subjects were pooled, the changes in HRV in the supine position were correlated to the changes in aerobic capacities, i.e., HF, LF and TP were correlated to VO(2RCP) and HR, HF and TP were correlated to PRCP. This study confirms the relationship between HRV and changes in aerobic capacity, therefore highlighting the potential value of HRV for monitoring altitude training adaptations.
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Schmitt et al. (2008) studied Healthy Nordic-skiers (n=11). Living high-training low (Hi-Lo) in hypoxic rooms vs. Sleeping at 1200 m was evaluated on VO2 and power at the respiratory compensation point (VO2RCP and PRCP). Living high-training low in hypoxic rooms increased VO2 and power at the respiratory compensation point by 7.5% and 5.0%, respectively, in Nordic-skiers.
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