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Fig. 1. Enzyme activities from ventricular cardiac muscle of pikas collected across an altitudinal gradient: Russian pikas (Ochotona hyperborea) residing at sea level (N=4), collared pikas (Ochotona collaris) residing at 1070 m (N=9) and North American pikas (Ochotona princeps) residing at 3350 m (N=8). Values are means ± S.E.M. CS, citrate synthase; HOAD, ß-hydroxyacyl CoA dehydrogenase; LDH, lactate dehydrogenase.