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Although human T-cell leukemia virus (HTLV) type I is known to cause a number of diseases, there has been no convincing evidence of pathological changes after infection with the related virus, HTLV-II. We have found an endemic focus of HTLV-II infection among members of an American Indian population in New Mexico, USA. We set out to determine the(More)
OBJECTIVE To assess the influence of different breathing patterns on autonomic cardiovascular modulation during acute exposure to altitude-induced hypoxia. DESIGN We measured relative changes in minute ventilation (VE), oxygen saturation (%SaO2), spectral analysis of RR interval and blood pressure, and response to stimulation of carotid baroreceptors(More)
1. To assess the effects of acute exposure to high altitude on baroreceptor function in man we evaluated the effects of baroreceptor activation on R-R interval and blood pressure control at high altitude. We measured the low-frequency (LF) and high-frequency (HF) components in R-R, non-invasive blood pressure and skin blood flow, and the effect of(More)
Strenuous exercise increases plasma melatonin, cortisol, and beta-endorphin concentrations. Furthermore, a relationship between endogenous opioids and melatonin has been proposed. We measured plasma melatonin, cortisol, and beta-endorphin in 46 subjects before and after a 28.5-mile high altitude race. Thirteen of the subjects received the orally active(More)
AIM Interval hypoxic training was proposed as a technique for adapting hypoxia of various origins. Its effects on the hypoxic ventilatory response and on cardiovascular autonomic control are unknown. METHODS AND RESULTS We recorded ventilation, end-tidal oxygen (PETO2) and carbon dioxide partial pressures, RR interval and blood pressure during progressive(More)