ArticleFrontiers in physiology2026
Time-dependent changes in aerobic capacity of acute sub-high altitude exposure in elite youth endurance athletes.
Article in Frontiers in physiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Purpose: This study investigated the non-linear, time-dependent alterations in cardiorespiratory fitness, running economy (RE), and metabolic kinetics during the first week of acute exposure to a sub-high altitude (1,300 m) in elite youth endurance athletes. Methods: Fourteen male national-level middle- and long-distance runners (age: 19.8 ± 0.7 years; sea-level Results: One-way RM ANOVA revealed a significant main effect of time on Conclusion: Acute relocation to 1,300 m induces a distinct physiological nadir on Day 4, which may be related to transient autonomic adjustments and respiratory muscle work, rather than hematological adaptations. Early adaptation emerges by Day 6. Coaches may consider closer monitoring and temporary adjustment of training intensity during the early days following ascent, particularly around day 4.
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