EXCESS CO<SUB>2</SUB> OUTPUT INDEPENDENT OF HYPERVENTILATION DURING CONSTANT-LOAD EXERCISE
نویسندگان
چکیده
منابع مشابه
Oxygen consumption during constant-load exercise.
Previous investigators have reported that oxygen consumption (VO2) continues to rise after the initial 2- to 3-min transient period of exercise when work exceeds approximately 60% of VO2 max. The purpose of this investigation was to examine the possible causes of this slow rise in VO2. Eighteen subjects exercised for 20 min at 65% and at 80% of VO2 max on the bicycle ergometer. VO2, ventilation...
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We compared pulmonary mechanics measured during long-term exercise (LTX = 20 min) with long-term isocapnic hyperventilation (LTIH = 20 min) in the same asthmatic individuals (n = 6). Peak expiratory flow (PEF) and forced expiratory volume in 1 s (FEV(1)) decreased during LTX (-19.7 and -22.0%, respectively) and during LTIH (-6.66 and 10. 9%, respectively). In contrast, inspiratory pulmonary res...
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Humoral factors play an important role in the control of exercise hyperpnea. The role of neuromechanical ventilatory factors, however, is still being investigated. We tested the hypothesis that the afferents of the thoracopulmonary system, and consequently of the neuromechanical ventilatory loop, have an influence on the kinetics of oxygen consumption (VO2), carbon dioxide output (VCO2), and ve...
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We have studied the kinetics of mixed venous C02 pressure (Pi-,co2) at constant work rates of 300, 450 and 600 kpmlmin (Yano, 1986). The PVco, increased at the onset of exercise, and reached a steady state at 300 and 450 kpmlmin. However, at 600 kpmlmin, the PVco2 indicated a relatively high steady state in comparison with those at other work rates, and decreased after 5 min of exercise. This o...
متن کاملThermal drive contributes to hyperventilation during exercise in sheep.
The etiology of exercise hypocapnia is unknown. The contributions of exercise intensity (ExInt), lactic acid, environmental temperature, rectal temperature (Tre), and physical conditioning to the variance in arterial CO2 tension (PaCO2) in the exercising sheep were quantified. We hypothesized that thermal drive contributes to hyperventilation. Four unshorn sheep were exercised at approximately ...
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ژورنال
عنوان ژورنال: Japanese Journal of Physical Fitness and Sports Medicine
سال: 1991
ISSN: 0039-906X,1881-4751
DOI: 10.7600/jspfsm1949.40.437