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hyperventilation/hypoxia
Ο σύνδεσμος αποθηκεύεται στο πρόχειρο
Σελίδα 1 από 837 Αποτελέσματα
[Interrelations of hypocapnia, hypoxia, cerebral blood flow and electrical activity of the brain under voluntary hyperventilation in humans].
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Σύνδεση εγγραφή
Changes of different physiological parameters in human caused by hyperventilation of 3-min and longer duration were investigated and correlated. It was found that during 3-min hyperventilation, resulting in 4.5-5 fold increase of the respiration velocity, similar phasing changes of the central and
Augmented hyperventilation via normoxic helium breathing does not prevent exercise-induced hypoxemia.
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The purpose of this study was to determine if augmented hyperventilation produced via normoxic helium breathing would reduce exercise-induced hypoxemia (EIH). Seven highly trained endurance athletes with a mean maximum oxygen uptake of 65 ml.kg-1.min-1, performed two cycle ergometer tests to
Ventilatory responses to inhaled carbon dioxide, hypoxia, and exercise in idiopathic hyperventilation.
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Σύνδεση εγγραφή
Idiopathic hyperventilation (IH) is a poorly understood condition of sustained hypocapnia and controversial etiology. Although behavioral/emotional factors may contribute, it is uncertain whether chemosensitivity is altered, hyperventilation is maintained during exercise, and the associated
Hypoxia following voluntary hyperventilation during exercise in man.
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Σύνδεση εγγραφή
The importance of carbon dioxide in the control of ventilation during exercise was tested by emptying CO2 stores by voluntary hyperventilation. Healthy subjects were studied after 3 min hyperventilation down to an end-tidal PCO2 of about 20 mmHg on a background of steady exercise at 75 W. Control
Voluntary hyperventilation into a simple mixing chamber relieves high altitude hypoxia.
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Involuntary hyperventilation is a critical factor in acclimatization to a high altitude. Unacclimatized subjects do poorly when acutely exposed to high altitude. This may not be due to hypocapnia itself, but rather an associated symptom which inhibits hypoxic respiratory stimulation. In an
Interaction of hypocapnia, hypoxia, brain blood flow, and brain electrical activity in voluntary hyperventilation in humans.
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Σύνδεση εγγραφή
Changes in various physiological measures in voluntary hyperventilation lasting three minutes or more in humans were studied and compared. Three-minute hyperventilation, in which the rate of external ventilation increased by an average factor of 4.5-5, produced similar phasic changes in central and
Effect of voluntary hypocapnic hyperventilation or moderate hypoxia on metabolic and heart rate responses during high-intensity intermittent exercise.
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OBJECTIVE
To investigate the effect of voluntary hypocapnic hyperventilation or moderate hypoxia on metabolic and heart rate responses during high-intensity intermittent exercise.
METHODS
Ten males performed three 30-s bouts of high-intensity cycling [Ex1 and Ex2: constant-workload at 80% of the
Slow ventilatory dynamics after isocapnic hypoxia and voluntary hyperventilation in humans: effects of isoflurane.
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Short-term potentiation (STP) of breathing refers to respiratory activity that persists at termination of a primary stimulus and is not related just to the dynamics of chemoreceptors. In humans, STP is activated by brief episodes of hypoxia and voluntary hyperventilation (VHV). STP exerts a
Ventilatory responses to hypercapnia and hypoxia after 6 h passive hyperventilation in humans.
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Σύνδεση εγγραφή
1. Acute exposure to hypoxia stimulates ventilation and induces hypocapnia. Long-term exposure to hypoxia generates changes in respiratory control known as ventilatory acclimatization to hypoxia. The object of this study was to investigate the degree to which the hyperventilation and hypocapnia can
Effects of hyperventilation and hypocapnic/normocapnic hypoxemia on renal function and lithium clearance in humans.
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BACKGROUND
Using the renal clearance of lithium as an index of proximal tubular outflow, this study tested the hypothesis that acute hypocapnic hypoxemia decreases proximal tubular reabsorption to the same extent as hypocapnic normoxemia (hyperventilation) and that this response is blunted during
Effects of hyperventilation on the circulatory response of the rabbit to arterial hypoxia.
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1. The circulatory effects of artificial hyperventilation with air and low oxygen mixtures were studied in rabbits anaesthetized with chloralose-urethane and given decamethonium iodide. The role of vagal afferents in the response to hypoxia was also assessed in spontaneously breathing
Role of nitric oxide in rat locus coeruleus in hypoxia-induced hyperventilation and hypothermia.
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The locus coeruleus modulates the ventilatory and thermoregulatory response to hypoxia and contains nitric oxide synthase. Therefore, we examined the effects of L-NAME unilaterally microinjected into the locus coeruleus on hypoxic hyperventilation and hypothermia. Ventilation and body temperature
The nucleus raphe magnus modulates hypoxia-induced hyperventilation but not anapyrexia in rats.
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The nucleus raphe magnus (NRM) is one of the brainstem cell groups involved in physiological responses to hypoxia. Thus, we tested the hypothesis that the NRM modulates hypoxia-induced hyperventilation and anapyrexia. To this end, we assessed the participation of NRM in the respiratory and
Glutamatergic neurotransmission modulates hypoxia-induced hyperventilation but not anapyrexia.
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The interaction between pulmonary ventilation (V E) and body temperature (Tb) is essential for O2 delivery to match metabolic rate under varying states of metabolic demand. Hypoxia causes hyperventilation and anapyrexia (a regulated drop in Tb), but the neurotransmitters responsible for this
Hyperventilation following aero-medical rapid sequence intubation may be a deliberate response to hypoxemia.
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BACKGROUND
Recent studies document a high incidence of hyperventilation by prehospital providers, with a potentially detrimental effect on outcome in traumatic brain injury (TBI).
OBJECTIVE
To document the incidence of hyperventilation by aero-medical providers and explore a possible relationship
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