Key result
A single power strength training session at simulated altitudes up to 4000 m resulted in no significant differences in heart rate variability parameters 24 hours post-exercise (p>0.05).
Why the study?
This study assessed heart rate variability after a single power strength training session performed at different hypoxic levels.
Does a single power strength training session at different simulated altitudes affect heart rate variability in physically active subjects?
Does a single power strength training session at different simulated altitudes affect heart rate variability in physically active subjects?
p-value: p=>0.05
A single power strength training session at simulated altitudes up to 4000 m does not significantly perturb heart rate variability 24 hours post-exercise.
Acute power training at simulated altitudes ≤4000 m leaves 24-h HRV unaffected; hypothesis-generating for altitude effects on autonomic recovery.
Álvarez-Herms, Jesús, Sonia Julià-Sánchez, Hannes Gatterer, Francisco Corbi, Gines Viscor, and Martin Burtscher. Effects of a single power strength training session on heart rate variability when performed at different simulated altitudes. High Alt Med Biol . 21:292–296, 2020. Background: This study assessed heart rate variability (HRV) after a single power strength training session performed at different hypoxic levels. Materials and Methods: Eight physically active subjects (31.1 ± 4.3 years; 177.6 ± 3.0 cm; 70.1 ± 5.2 kg) performed 6 bouts of 15-second continuous maximal jump exercises interspersed by 3 minutes of rest at different altitude levels (total volume of each session: 20 minutes). The normoxic hypoxia levels were FiO 2 low altitude: 20.9%; moderate altitude: 16.5%; and high altitude: 13.5%. Results: Average power output during the jumps was similar for all conditions (≅3150 W). Twenty-four hours before (PRE) and 24 hours after (POST) each training session, HRV parameters (R-R, square root of the mean of the sum of differences between intervals [RMSSD], pNN50, and very low frequency, low frequency, and high frequency) were determined without resulting in significant statistical differences, neither from PRE to POST nor between conditions ( p > 0.05). Conclusions: This study showed a negligible perturbation of HRV parameters 24 hours after a single power strength session up to a hypoxic level equivalent to 4000 m. Further studies are needed to determine the hypoxia-dependent threshold and intensities of training loads affecting HRV.
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Álvarez‐Herms et al. (2020) studied Physically active subjects (n=8). Power strength training at simulated altitudes vs. Low altitude (FiO2 20.9%) was evaluated on Heart rate variability (HRV) parameters (R-R, RMSSD, pNN50, VLF, LF, HF) 24 hours post-exercise (p=>0.05). A single power strength training session at simulated altitudes up to 4000 m resulted in no significant differences in heart rate variability parameters 24 hours post-exercise (p>0.05).
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