Hormonal
Endurance training under simulated hypoxic conditions (3,850m) induces specific molecular adaptations in human skeletal muscle, including increased HIF-1a, myoglobin, and VEGF mRNA, which do not translate to greater global functional improvements (VO2max or power output) compared to normoxic training.
If your goal is to maximize VO2max or power output, training at simulated altitude (3,850m) offers no advantage over training at sea level. You will see similar functional gains. However, if you are interested in specific molecular adaptations like increased oxygen-sensing capacity (HIF-1) or oxygen transport proteins (myoglobin/VEGF), hypoxic training may be relevant, though these changes do not currently translate to better performance metrics in untrained individuals.
Similar increases in maximal O2 uptake (8.3–13.1%) and maximal power output (11.4–20.8%) were found in all groups... Our findings suggest that HIF-1 is specifically involved in the regulation of muscle adaptations after hypoxia training. Fine-tuning of the training response is recognized at the molecular level, and with less sensitivity also at the structural level, but not at global functional responses like maximal O2 uptake or maximal power output.
Why this rating
Randomized controlled trial with clear protocols and objective molecular/functional measures, though sample size is moderate (n=30).
Source
Molecular adaptations in human skeletal muscle to endurance training under simulated hypoxic conditions
Michael Vogt et al. · Journal of Applied Physiology · 2001
DOI 10.1152/jappl.2001.91.1.173
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