Lung function of young Aymara highlanders

The patterns of development of FVC, FEV and %FEV are examined in 217 male and 195 female youths of Aymara ancestry residing in La Paz, Bolivia (altitude 3600 m). The data provide some evidence of an acceleration in the development of lung function relative to stature in Aymara children, beginning during early adolescence, and also indicate that there is a strong relationship between lung function and chest dimensions in Aymara children. Similar patterns have been observed among Quechua youth. However, despite the general similarity between Quechua and Aymara youths in the development of lung function, there are potentially important differences between them. In particular, the magnitude of the acceleration of lung volumes relative to stature among Aymara children appears to be considerably less than is exhibited by highland Quechua children. In addition, shorter Quechua boys have FVC values similar to those of shorter Aymara boys, despite having significantly larger chests, while taller Quechua boys have considerably larger FVC values than taller Aymara boys, without a corresponding increase in chest size relative to stature. Thus, although lung volumes and chest dimensions are closely related in both groups, the development of lung function to chest size of Quechua boys appears to be somewhat different from that of Aymara boys and, in particular, to be amplified during adolescence in response to factors other than simply an increase in chest size.