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Digitale Medien

Charge correlations as a probe of nuclear disassembly

Kreutz, P. ; Adioff, J.C. ; Begemann-Blaich, M. ; [weitere]

Amsterdam : Elsevier

Nuclear Physics, Section A 556 (1993), S. 672-696

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ISSN: 0375-9474

Schlagwort(e): Nuclear reactions

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Physik

Materialart: Digitale Medien

URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(93)90476-E

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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

Plasma adrenocorticotrophin and cortisol responses to acute hypoxia at rest and during exercise (1988)

Bouissou, P. ; Fiet, J. ; Guezennec, C. Y. ; [weitere]

Springer

European journal of applied physiology 57 (1988), S. 110-113

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ISSN: 1439-6327

Schlagwort(e): Adrenocorticotrophin ; Plasma cortisol ; Exercise ; Acute hypoxia ; Plasma lactate

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary Plasma adrenocorticotrophin (ACTH) and cortisol (F) concentrations were studied in six male subjects under normoxic (N) and acute hypoxic (H) conditions (altitude 3000 m) in a hypobaric chamber. Comparisons were made at rest, at 15, 30, and 60 min of exercise (65% $$\dot V_{{\text{O}}_{{\text{2max}}} } $$ ), and after a 10 min recovery period. Mean (±SE) resting plasma ACTH levels were significantly higher in H (18.6±5.7 pmol · l−1) than in N (9.6±1.6 pmol · l−1) but no difference in resting plasma cortisol was observed between the two conditions. Both plasma ACTH and F concentrations were significantly increased at 60 min of exercise and during the recovery period under normoxic conditions. Hypoxia did not affect the ACTH response to exercise but reduced cortisol elevation. The changes in plasma cortisol concentration from rest to exercise were significantly correlated to ACTH under normoxic (r=0.89,p〈0.001) but not under hypoxic (r=0.43, NS) conditions. Plasma lactate concentration was higher at the end of exercise in hypoxia (p〈0.01), and no correlation existed between plasma lactate and ACTH levels. These observations provide further evidence that at sea level the increase in plasma cortisol levels during exercise is the result of ACTH-induced steroidogenesis. The responses observed at rest and during exercise in hypoxia suggest that adrenal sensitivity for ACTH may be altered.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00691248

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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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