1996h-645 1996k-714 1999d-804 adaptation adverseeffects altitude anthropology anthropometry arcticpeoples arcticregions bodytemperatureregulation cold coldadaptation coldregions coldtemperature congresses discoveryandexploration expeditions food foodpreservation gb2403t823g1970 geomorphology healthandhygiene hibernation history humanbiology humanphysiology ice influenceof mammals militarypersonnel nutrition nutritionalphysiologicalphenomena nutritionalrequirements physical physicalanthropology physiological physiologicaleffect physiology preservation qe576 ql755i6151985l qu145n977691996 requirements socialadjustment socialconditions soldiers wa11pa7f295p1997 wintering