People dwelling at higher altitudes have significantly shorter lower arm segments, according to a new study.
The team, however, found that their length of upper arm and hand were almost similar to those from lower altitudes.
The authors explained that oxygen levels are lower at higher altitudes which may reduce the efficiency of conversion of food into energy in an individual's body and may lead to relatively limited energy available for growth.
"Our findings are really interesting as they show that the human body prioritises which segments to grow when there is limited energy available for growth, such as at high altitude. This comes at the expense of other segments, for example the lower arm," said lead author Stephanie Payne from the University of Cambridge.
"The body may prioritise full growth of the hand because it is essential for manual dexterity, whilst the length of the upper arm is particularly important for strength," Payne added.
In the study, published in the journal Royal Society Open Science, the researchers examined over 250 individuals who belonged to the Himalayan Sherpa populations.
Then they compared the data to genetically similar Tibetan groups living in the lowlands of Nepal.
While this pattern of differential limb segment growth is interesting, scientists are still uncertain of the biological mechanism behind it.
(With IANS Inputs)