Wurk Performance ut AZtitzlde After Aduptation in M&H and Dog

HE PHYSIOLOGICAL changes that occur during adaptation to altitude have been reviewed by Stickney and Van Liere (I). For a number of years Hurtado and his asso-ciates have been studying these adaptive changes. These have included many studies of work performance on Peruvian military per-sonnel at Lima (sea level) and at Morococha, 14,900 feet (14.9 M)4 above sea level (2). The problem of the ideal work capacity or function test in health and disease has been discussed by Wahlund (3). Astrand (4) has described the effect of age and sex on work capacity. Bruce et al. (5, 6) have approached the problem of functional capacity by formulating an index of physical fitness, using three fundamental as-pects of performance which proved to have low coefficients of variability. These characteristics were duration of exertion, efficiency of oxygen uptake, and rapidity of circulatory recovery. The purpose of this study was to record the work capacity or performance before, during and after adaptation to altitude