کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8650083 | 1571074 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In Shackleton's trails: Central and local thermoadaptive modifications to cold and hypoxia after a man-hauling expedition on the Antarctic Plateau
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم کشاورزی و بیولوژیک (عمومی)
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چکیده انگلیسی
Cold and hypoxia constitute the main environmental stressors encountered on the Antarctic Plateau. Hence, we examined whether central and/or peripheral acclimatisation to the combined stressors of cold and hypoxia would be developed in four men following an 11-day man-hauling expedition on this polar region. Before and after the journey, participants performed a static whole-body immersion in 21â¯Â°C water, during which they were breathing a hypoxic gas (partial pressure of inspired O2: ~97â¯mmHg). To evaluate their local responses to cold, participants also immersed the hand into 8â¯Â°C water for 30â¯min, while they were whole-body immersed and mildly hypothermic [i.e. 0.5â¯Â°C fall in rectal temperature (Trec) from individual pre-immersion values]. Trec and skin temperature (Tsk), skin blood flux, and oxygen uptake (reflecting shivering thermogenesis) were monitored throughout. The polar expedition accelerated by ~14â¯min the drop in Trec [final mean (95% confidence interval) changes in Trec: Before =â¯â0.94 (0.15)â¯Â°C, After: ââ¯1.17 (0.23)â¯Â°C]. The shivering onset threshold [Before: 19 (22)â¯min, After: 25 (19)â¯min] and gain [Before: ââ¯4.19 (3.95)â¯mLâ¯minâ1 kgâ1, After: ââ¯1.70 (1.21)â¯mLâ¯minâ1 kgâ1] were suppressed by the expedition. Tsk did not differ between trials. The development of a greater post-expedition hypothermic state did not compromise finger circulation during the hand-cooling phase. Present findings indicate therefore that a hypothermic pattern of cold acclimatisation, as investigated in hypoxia, was developed following a short-term expedition on the South Polar Plateau; an adaptive response that is characterised mainly by suppressed shivering thermogenesis, and partly by blunted cutaneous vasoconstriction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Thermal Biology - Volume 73, April 2018, Pages 80-90
Journal: Journal of Thermal Biology - Volume 73, April 2018, Pages 80-90
نویسندگان
Michail E. Keramidas, Roger KölegÃ¥rd, Ola Eiken,