INTERMITTENT HYPOXIA DOES NOT AFFECT ARTERIAL OXYGEN SATURATION AT REST DURING SHORT-TERM EXPOSURE TO SIMULATED ALTITUDES UP TO 4000 M*
Journal Title: Medicina Sportiva - Year 2012, Vol 16, Issue 3
Abstract
Introduction: Intermittent hypoxia (IH) is assumed to prevent acute mountain sickness by inducing aspects of accli¬matization. Although several studies have considered IH for prophylaxis of acute mountain sickness, no systematic results are available. Objective: To investigate the effects of IH on resting physiological parameters during exposure to different simulated altitudes up to 4000 m. Methods: Nine healthy male volunteers (26 ± 4 years) were exposed to different levels of normobaric hypoxia correspond¬ing to altitudes of 1000 m, 2000 m, 3000 m, and 4000 m (random order, single blinded). After 20 minutes at rest ventilation, arterial oxygen saturation, heart rate, and blood lactate concentration were measured. After a pre-acclimatization program (IH: 7 x 1 hour at rest, corresponding altitude 4500 m) the identical test procedure was repeated. A two-way ANOVA with repeated measures was used to detect effects of IH and altitude. P-values < 0.05 (two-tailed) were considered to indicate statistical significance.Results: Arterial oxygen saturation decreased with altitude, but there was no effect of IH. Blood lactate concentrations were lower after IH irrespective of altitude. Conclusions: The present results do not indicate that the applied IH protocol improved arterial oxygen saturation dur¬ing subsequent exposures to altitudes up to 4000 m. However the reduced blood lactate concentrations may suggest an AMS-prophylactic effect of IH by reducing catecholamine levels during subsequent high-altitude exposures.
Authors and Affiliations
Martin Faulhaber, Hannes Gatterer, Luciano Bernardi
Keywords
Related Articles
- EP ID EP74186
- DOI 10.5604/17342260.1011383
- Views 91
- Downloads 0
EFFECTS OF WINTER SWIMMING AND WHOLE-BODY CRYOTHERAPY ON THE HEMATOLOGICAL AND RHEOLOGICAL PROPERTIES OF BLOOD IN REGULAR WINTER SWIMMERS AND INDIVIDUALS EXPOSED TO WHOLE-BODY CRYOTHERAPY
Introduction: Exposure to cold is one of the strongest physiological and psychological environmental stressors and induces an array of significant functional responses. Objective: To analyze the changes in morphological...
CHANGES OF BODY COMPOSITION PARAMETERS AFTER MAXIMUM AEROBIC LOAD USING BIA METHOD
Introduction: In the course of a spiroergometric test external physiological symptoms and internal response of the organism to the load can be followed. It is clear that gradual load increase up to “vita maxima“ must at...
EFFECT OF CAFFEINE ON FATIGUE DURING SUBMAXIMAL ISOMETRIC CONTRACTIONS AT DIFFERENT KNEE ANGLES
Introduction: In the knee extensors, the time to fatigue for intermittent isometric contractions can be increased by caffeine. Fatigue is muscle length dependent. Objective: We examined the effect of caffeine on fatigue...
DIETARY RESTRAINTS IN RELATION TO NUTRIENT INTAKE AND MORPHOROGICAL PARAMETERS IN YOUNG BALLET DANCERS
Introduction: Dietary restraints are very often in ballet dancers.Objective: To investigate the prevalence of dietary restraints in ballet dancers and to examine the nutritional consequences of dietary restraints and its...
EFFECTS OF REHABILITATION IN THE FORM OF DANCE AND MOVEMENT THERAPY ON NITRIC OXIDE LEVELS IN ELDERLY WOMAN
Introduction: Nitric oxide (NO) is a multifunctional molecule, acting as a neurotransmitter and mediating the inflammatory response and regulation of vascular tone. Insufficient NO production is one of the earliest sympt...