منابع مشابه
Respiratory and circulatory control during sleep.
A survey of the literature on a large number of vertebrate animals shows that sleep is associated with profound cardiovascular and respiratory adjustments which are very similar in each species. A hypothesis is advanced that these adjustments are 'goal directed' by neural structures in the brainstem, to ensure an adequate O2 and CO2 transport to and from the brain whilst at the same time reduci...
متن کاملRespiratory and circulatory control at high altitudes.
Hyperventilation is one of the most important features of acclimatization to high altitude. Resting ventilation at extreme altitudes increases up to fourfold and exercise ventilation for a given work level increases to the same extent. Hypoxic stimulation of the peripheral chemoreceptors is the chief mechanism for the hyperventilation but there is also evidence that central sensitization of the...
متن کاملCirculatory and respiratory effects of guanethidin.
Guanethidin has been shown by Maxwell et al. (1959) to be a potent antihypertensive agent in dogs, and by Page and Dustan (1959) and Leishman et al. (1959) to be hypotensive in human patients. It selectively inhibits sympathetic activity, probably by blocking postganglionic adrenergic neurones. The intention of this study is to examine the acute effect of guanethidin in patients with increased ...
متن کاملThe defence-arousal system and its relevance for circulatory and respiratory control.
It was proposed some fifty years ago that the visceral and hormonal changes accompanying fear and rage reactions can best be understood as adaptations which prepare an organism to cope with an emergency and specifically to perform the extreme muscular exertion of flight or attack. This is well exemplified by the pattern of cardiovascular response which is characteristic of the alerting stage of...
متن کاملHyperbaric Oxygen in Relation to Circulatory and Respiratory Emergencies.
A patient is placed in a pressure chamber and breathes oxygen in order to increase the oxygenation of an organ or tissue which has been rendered anoxic or ischaemic by disease or accident. The theory is simple; successful practical application depends on the appreciation of certain difficulties. Table I shows the "ideal" alveolar oxygen partial pressures which are attainable with oxygen at 1 an...
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ژورنال
عنوان ژورنال: The Journal of Physical Fitness and Sports Medicine
سال: 2021
ISSN: ['2186-8123', '2186-8131']
DOI: https://doi.org/10.7600/jpfsm.10.316