The effects on cognitive performance of breathing air, oxygen and nitrox gas mixtures at surface ambient pressures were investigated during an expedition to the Everest region of Nepal. A slight improvement in grammatical reasoning at altitude was found under nitrox (p < 0.05) and mathematical reasoning showed improvement at altitude on air (p < 0.05), oxygen (p < 0.01) and nitrox (p < 0.01). T...

Growth and development are clearly affected by high-altitude exposure to hypoxia, nutritional stress, cold or a combination of these factors. Very little research has been conducted on the growth and nutritional status of children living on the Tibetan Plateau. The present study evaluated the environmental impact on human growth by analyzing anthropometric characteristics of Tibetan children ag...

This paper presents observations of low-altitude mid-latitude E-region irregularities obtained with the 52MHz Chung-Li VHF radar. These are carried out in the interferometer mode to investigate the behavior of these irregularities over time and space. The observations presented here show the characteristics of type-II echoes noted by a negative slope, i.e. they are approaching the radar as a fu...

Background: Measurement of background radiation is very important from different points of view especially for human health. The aim of this survey was focused on determining the current background radiation in one of the highest altitude regions ( Zagros Mountains ), Chaharmahal and Bakhtiari province, in the south west of Iran . Materials and Methods: The outdoors-environmental monitoring exp...

Data on mercury levels in freshwater fish (mainly pike, perch, trout and char), from Norway, Sweden and Finland have been collected in a common database to assess spatial patterns as well as relationships with environmental factors such as atmospheric mercury deposition. A preliminary evaluation of fish Hg data from >1500 lakes shows that Hg levels referring to a 1-kg pike are highest in low-al...

4,eOO m in a hypobaric chamber under ambient temperatures of 16°C , 20"C, 24°C and 28°C . Oxygen uptake (Vo2), cardiac output (Q ; C02 rebreathing method), arteriovenous 02 difference (AVOD), heart rate (HR), and stroke volume (SV) were rneasured during two successive submaximal exercises after 2 hours of exposure. Vo2 and SV at high altitudes were similar to those at sea level. Q and HR at a g...

This study aimed to identify differences in wing shape among populations of Melipona quadrifasciata anthidioides obtained in 23 locations in the semi-arid region of Bahia state (Brazil). Analysis of the Procrustes distances among mean wing shapes indicated that population structure did not determine shape variation. Instead, populations were structured geographically according to wing size. The...