University of Tehran Journal of Sport Biosciences 2008-9325 9 4 2017 12 22 The Role of Orexin-A and HIF-1 Responses in Acute Mountain Sickness The Role of Orexin-A and HIF-1 Responses in Acute Mountain Sickness 529 541 66092 10.22059/jsb.2018.238223.1185 FA Bayan Fayazi university razi Vahid Tadibi Associate Professor; Department of exercise physiology, Faculty of Physical of Physical Education and Sport Sciences, Razi University Kermanshah, Kermanshah, Iran. Naser Behpoor Associate Professor, Faculty of Sports Sciences, Department of Exercise Physiology, Razi University, Kermanshah, Iran Mehdi Hedayati Associate Professor, Faculty of Medical Sciences, Department of Biochemistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Journal Article 2017 07 15 Acute mountain sickness (AMS) caused by rapid ascent to altitudes higher than 2500 m has complex pathophysiological conditions. Therefore, the aim of the present study was to investigate hypoxia related factors in individual susceptible to acute mountain sickness. 21 healthy subjects (mean age 31.7±8.5 year) participated in this study. Fasting blood samples were collected from antecubital vein (sea level) 1 hour and 24 hours after rapid ascent to an altitude of 3550 m by a gondola lift. HIF-1 and Orexin-A were measured by ELISA method. AMS status was measured by the Lake Louise Scoring 6 hours after the exposure to a high altitude. Lake Louise Scoring showed that 11 subjects got AMS after the exposure to a high altitude (LLS≥4). The results showed that Orexin-A and HIF-1 at sea level were higher in AMS-susceptible subjects than AMS-resistant subjects. But Orexin-A and HIF-1 responses were almost higher in AMS-susceptible subjects than AMS-resistant subjects. Orexin-A and HIF-1 at sea level had an inverse relationship with AMS. An increase in these proteins in AMS-susceptible subjects was drastically higher than AMS-resistant subjects after exposure to altitude. Acute mountain sickness (AMS) caused by rapid ascent to altitudes higher than 2500 m has complex pathophysiological conditions. Therefore, the aim of the present study was to investigate hypoxia related factors in individual susceptible to acute mountain sickness. 21 healthy subjects (mean age 31.7±8.5 year) participated in this study. Fasting blood samples were collected from antecubital vein (sea level) 1 hour and 24 hours after rapid ascent to an altitude of 3550 m by a gondola lift. HIF-1 and Orexin-A were measured by ELISA method. AMS status was measured by the Lake Louise Scoring 6 hours after the exposure to a high altitude. Lake Louise Scoring showed that 11 subjects got AMS after the exposure to a high altitude (LLS≥4). The results showed that Orexin-A and HIF-1 at sea level were higher in AMS-susceptible subjects than AMS-resistant subjects. But Orexin-A and HIF-1 responses were almost higher in AMS-susceptible subjects than AMS-resistant subjects. Orexin-A and HIF-1 at sea level had an inverse relationship with AMS. An increase in these proteins in AMS-susceptible subjects was drastically higher than AMS-resistant subjects after exposure to altitude. https://jsb.ut.ac.ir/article_66092_f57248e2106e284b1cd587d18c6cff37.pdf