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Digitale Medien

Metabolic and endocrine responses to graded exercise under acute hypoxia (1986)

Bouissou, P. ; Péronnet, F. ; Brisson, G. ; [weitere]

Springer

European journal of applied physiology 55 (1986), S. 290-294

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ISSN: 1439-6327

Schlagwort(e): Catecholamines ; Metabolic response ; Pancreatic hormones ; Acute hypoxia

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary Eight male subjects (24±1 years old) performed graded ergocycle exercises in normoxic (N) and acute hypoxic (H) conditions (14.5% O2). $$\dot V_{O_{_2 max} } $$ decreased from 55.5±1.3 to 45.8±1.4 ml · kg−1 · min−1 in H condition. Plasma glucose and free fatty acid concentrations remained unchanged throughout exercise in both conditions. Increase in blood lactate concentration was associated with relative workload in both conditions. At $$\dot V_{O_{_2 max} } $$ lactate concentrations were similar in the two conditions, plasma insulin, glucagon, and LH concentrations did not significantly change in either. Plasma δ4-androstenedione and testosterone increased in a similar manner in both conditions. Finally plasma norepinephrine concentration reached at $$\dot V_{O_{_2 max} } $$ was significantly lower in hypoxia. These results suggest that acute moderate hypoxia does not affect metabolic and hormonal responses to short exercise performed at similar relative workloads, i.e. when the reduction of $$\dot V_{O_{_2 max} } $$ due to hypoxia is taken into consideration. The lower catecholamine response to maximal exercise under acute hypoxia might suggest that the sympathetic response could be related to relative as well as absolute workloads.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02343801

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Digitale Medien

Saliva flow and composition in humans exposed to acute altitude hypoxia (1990)

Pilardeau, P. ; Richalet, J. -P. ; Bouissou, P. ; [weitere]

Springer

European journal of applied physiology 59 (1990), S. 450-453

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ISSN: 1439-6327

Schlagwort(e): Exercise ; Acute hypoxia ; Saliva ; Parasympathetic activity

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary The effects of acute hypoxia (2 days at 4350 m) on whole saliva flow and composition were studied on 12 sea-level natives, at rest and following a maximal exercise. Exercise, performed in normoxia and hypoxia, did not induce variations in saliva flow rate, saliva potassium or α-amylase concentrations. In contrast, acute hypoxia did lead to an increase in mean saliva flow rate both at rest (0.63 ml·min−1 to 0.93 ml·min−1,P〈0.01) and after exercise (0.56 ml·min−1 to 1.06 ml·min−1,P〈0.05) and a decrease in mean saliva potassium concentration at rest (20.8 mmol·1−1 to 14.7 mmol·1−1,P〈0.01) as well as after exercise (21.7 mmol·1−1 to 16.5 mmol·1−1,P〈0.05). This effect might be the consequence of a hypoxia-induced stimulation of the parasympathetic nervous system.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02388627

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