Fig. 4. Time course of changes in state 4 and oligomycin-inhibited state 4 (state 4_ol) rates of pyruvate and palmitoyl carnitine oxidation by mitochondria from oxidative muscle during warm and cold acclimation. Rates are expressed per mg mitochondrial protein. Data are means ± S.E.M. When rates at a given assay temperature during each acclimation experiment differ, they are followed by different letters (P0.05; ANOVA and Tukey's a posteriori test).