Acute hypoxia decreases cardiac response to catecholamines in exercising humans.

Cardiac chronotropic response to adrenergic activity at rest and exercise has been studied in 8 sea-level natives on the first two days of exposure to high altitude hypoxia (3823 m, 473 mmHg). Maximal O2 uptake (VO2max) was determined at low altitude (day 0:D0) and high altitude (day 2:D2). Submaximal exercise tests were performed at low altitude (day 1:D1) and high altitude (days 3 and 4: D3, D4).

[Plasma catecholamines in dogs during cold exposure and muscular exercise at the same level of energy expenditure].

Plasma epinephrine, norepinephrine and substrate concentrations (glycemia, free fatty acids (FFA), lactic acid) have been compared in same dogs exposed to cold then made to perform a running test. Under both conditions energy expenditure was increased to the same level for each dog, approximately 7 fold the metabolic rate at rest: 1. Catecholamines were increased in cold exposed as well as in running dogs.

Plethysmography study and pulmonary function in well-trained adolescents.

The values of lung volumes (VC, FRC, TGV, FEV1.0, etc.) and airway resistances (Raw, Raw) were measured by the spirometry and plethysmography method in 35 physically well trained, healthy adolescents, aged 14 to 20 years, boys and girls coming from various schools from the Grenoble area.