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(a) The mechanical vertical power and (b) the metabolic power of Nepalese porters (NEP) and Caucasian mountaineers (CAU) are plotted against altitude and expressed in absolute units. All the different loads have been pooled. Descending curves represent the expected decay of performance due to hypoxia (Cerretelli 1976), with value at zero altitude set as to fit the experimental data. Asterisks denote significant differences: ***p<0.001; n.s., not significant.
