Article: article from journal or magazin.
Two days of hypoxic exposure increased ventilation without affecting performance.
Journal of Strength and Conditioning Research
Publication types: Journal Article ; Randomized Controlled Trial Publication Status: ppublish
The aim of this study was to test the short-term effects of using hypoxic rooms before a simulated running event. Thirteen subjects (29 +/- 4 years) lived in a hypoxic dormitory (1,800 m) for either 2 nights (n = 6) or 2 days + nights (n = 7) before performing a 1,500-m treadmill test. Performance, expired gases, and muscle electrical activity were recorded and compared with a control session performed 1 week before or after the altitude session (random order). Arterial blood samples were collected before and after altitude exposure. Arterial pH and hemoglobin concentration increased (p < 0.05) and PCO2 decreased (p < 0.05) upon exiting the room. However, these parameters returned (p < 0.05) to basal levels within a few hours. During exercise, mean ventilation (VE) was higher (p < 0.05) after 2 nights or days + nights of moderate altitude exposure (113.0 +/- 27.2 L.min) than in the control run (108.6 +/- 27.8 L.min), without any modification in performance (360 +/- 45 vs. 360 +/- 42 seconds, respectively) or muscle electrical activity. This elevated VE during the run after the hypoxic exposure was probably because of the subsistence effects of the hypoxic ventilatory response. However, from a practical point of view, although the use of a normobaric simulating altitude chamber exposure induced some hematological adaptations, these disappeared within a few hours and failed to provide any benefit during the subsequent 1,500-m run.
Adaptation, Physiological, Adult, Analysis of Variance, Anoxia/physiopathology, Anthropometry, Athletic Performance/physiology, Atmospheric Pressure, Blood Gas Analysis, Carbon Dioxide/blood, Exercise Test/methods, Female, Heart Rate/physiology, Humans, Lactates/metabolism, Male, Oximetry/methods, Oxygen Consumption/physiology, Probability, Reference Values, Respiratory Mechanics, Risk Factors, Running/physiology, Time Factors, Vital Capacity
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