Cross-Adaptation: Heat and Cold Adaptation to Improve Physiological and Cellular Responses to Hypoxia.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing physiological mechanisms without systematic search methodology or meta-analysis.
PubMed 28389828 · doi:10.1007/s40279-017-0717-z
What was done
This narrative review synthesized literature on cross-adaptation, examining how heat acclimation and cold acclimation alter physiological and cellular responses (cross-tolerance) to subsequent hypoxia or altitude exposure.
What was found
The abstract reports no numerical data or effect estimates. Qualitatively, heat acclimation attenuates physiological strain at rest and during moderate-intensity exercise under hypoxia, associated with plasma volume expansion, lower body temperature, enhanced oxygen delivery, and blunted heat shock protein responses. Cold acclimation appears to reduce autonomic strain at altitude, but no data on post-cold-acclimation exercise performance or capacity were identified.
Why it matters
Thermal interventions such as heat or cold acclimation could serve as practical alternatives or adjuncts to altitude training when direct hypoxic exposure is logistically unfeasible.
Limits
The abstract provides no study counts, sample sizes, or quantitative effect sizes. Primary gaps include an absence of exercise performance and cellular cross-tolerance data following cold acclimation, limited investigation at lower altitudes relevant to most athletes and workers, and unresolved cellular mechanisms across diverse populations.
Cited by
- supports Hormetic stressors induce cross-adaptation, meaning that exposure to one physical stressor confers biological resilience against other distinct stressors through shared and overlapping cellular pathways.