Ghrelin and leptin levels of sojourners and acclimatized lowlanders at high altitude

Abstract

The circulatory levels of two appetite regulatory hormones i.e. leptin and ghrelin were estimated in sojourners and acclimatized subjects to investigate their possible role in high altitude (HA) induced anorexia. A group of 30 lowlanders who had never visited HA were inducted to a height of 3600m by air and after 48h they were further taken to an altitude of 4300m by road. Blood samples were collected after 48h stay at 3600m and again after 48h and 7 days of stay at 4300m during 0700–0730h. There was a decrease in energy intake (850kcal/day) of sojourners, which resulted in loss of body weight by 2.12kg at HA. At an altitude of 4300m there was a significant increase in leptin over basal levels (54.9%, p <0.001) at 48h that persisted even after 7 days of stay at this altitude. Ghrelin levels of sojourners decreased by more than 30% in comparison to basal values at 48h of ascent to HA. Leptin levels of acclimatized lowlanders were also higher in comparison with control group (acclimatized group 7.6+0.6ng/ml vs. control 5.6+0.5ng/ml, p <0.01, n =50).