Growth characteristics of populations of Tibetan origin in Nepal.

Previous growth studies of highland-dwelling populations in the ecologically diverse areas of Peru and Ethiopia have yielded highly varied results: the retarded growth of the Peruvian sample was attributed to the effects of hypoxia, while the increased height and weight of the highland Ethiopian sample could be traced to better health conditions in the highland village than in the lowland village studied. In an attempt to provide a basis for evaluating studies of growth at high altitude, the present study compared Sherpa children living in the Everest region of Nepal with Tibetan children living in Kathmandu. It was found that: (1) the growth of Sherpa and Tibetan children is considerably retarded compared to other high altitude populations; (2) despite conditions favorable for optimum growth among the Tibetans, their growth resembled that of the Sherpas and (3) increased chest circumference, which seems to reflect a developmental acclimatization to hypoxia among Peruvian high-altitude natives, was not seen among the Sherpas.