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Normobaric Hypoxia Exposure on Substrate Oxidation Pattern: Sex Differences.

Context
Hypoxic exposure has been associated with a metabolic perturbation that might affect basal energy expenditure (BEE).


Objective
The aim was to examine the metabolic response during hypoxic exposure of men and women adults.


Design
Crossover design with two experimental trials: normoxic and hypoxic exposure.


Subjects and Methods
Twenty-nine healthy subjects (14 women) participated in (1) control study (NOR), subjected first to normoxic exposure (FiO2 = 20.9%) and (2) after that, to passive normobaric hypoxic exposure study (HYP) (FiO2 = 15%). Respiratory gases and blood glucose samples were recorded every hour in hypoxia chamber (8 points in total), and blood lactate samples were collected at baseline, at 4 and 7 h to exposure.


Results
In females, basal energy expenditure was significantly higher at 2h, 4h, 6h and 7h compared with NOR group. Also, BEE was lower in females compared with men from 2h of hypoxia exposure. In the HYP group the blood lactate concentration increased significantly at 4h and 7 h relative to NOR group (P < 0.05) in males.


Conclusion
An exposure to moderate normobaric hypoxia did not alter metabolic response, but induced a different response on substrate oxidation in adults men and women.