نتایج جستجو برای: high altitude
تعداد نتایج: 2068908 فیلتر نتایج به سال:
High-altitude destinations are visited by increasing numbers of children and adolescents. High-altitude hypoxia triggers pulmonary hypertension that in turn may have adverse effects on cardiac function and may induce life-threatening high-altitude pulmonary edema (HAPE), but there are limited data in this young population. We, therefore, assessed in 118 nonacclimatized healthy children and adol...
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 baroreceptor modulation by 0. 1-Hz sinusoidal n...
High altitude illnesses pose health threats to unwary travelers after their acute ascent to high altitude locations. The incidence of high altitude illnesses among unacclimatized persons who acutely ascend to Tibet has not been previously reported. In the present study, we surveyed the incidence of high altitude illness among 3628 unacclimatized persons who had no previous high altitude experie...
The response of pulmonary artery pressure to high altitude has not been studied in children. It is also not known whether the individual response is hereditary. Therefore, the response of pulmonary artery pressure to high altitude was measured in pre-pubertal children in comparison to that in their biological fathers. Echocardiography was performed at 450 m and over 3 days at 3,450 m. Systolic ...
This is an international consensus statement of an ad hoc committee formed by the International Society for Mountain Medicine (ISMM) at the VI World Congress on Mountain Medicine and High Altitude Physiology (Xining, China; 2004) and represents the committee's interpretation of the current knowledge with regard to the most common chronic and subacute high altitude diseases. It has been develope...
Stereo visual odometry has received little investigation in high altitude applications due to the generally poor performance of rigid stereo rigs at extremely small baseline-to-depth ratios. Without additional sensing, metric scale is considered lost and odometry is seen as effective only for monocular perspectives. This paper presents a novel modification to stereo based visual odometry that a...
On August 8, 1786 Michel Gabriel Paccard, the village doctor in Chamonix, with his guide Jacques Balmat, made the first ascent of Mont Blanc, and reached a height at which scientific opinion of the day considered life to be insupportable. Since that date the ways in which the body adapts to high altitude have interested in turn the physiologist, the mountaineer, the aviator, and now the cardiol...
Provision of broadband services is raising increasing challenges, particularly in operating environments requiring wireless access. In this context an emerging solution based on aerial platforms is attracting increasing amounts of research effort. This concept combines some of the best characteristics of terrestrial and satellite communication systems, and it provides alternative and complement...
The influence of hypoxia (lowered arterial blood and/or tissue PO2) on fetoplacental development and the role of hypoxia in preeclampsia are major research foci in perinatal biology. While animal and cell models are of utility, we do not know whether artificial hypoxic stimuli mimic the pathological conditions attributed to hypoxic stress in vivo; we cannot distinguish the effects of hypoxia fr...
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