Table 2.

Activity of citrate synthase, carnitine palmitoyl transferase and cytochrome c oxidase in oxidative muscle, expressed in U g−1 wet muscle

Citrate synthase Carnitine palmitoyl transferase Cytochrome c oxidase
Step5°C15°C5°C15°C5°C15°C
Warm acclimation
Initial17.1±0.6a28.4±0.7a0.37±0.02a0.74±0.03a54.3±3.0a,b65.5±3.0
Week 116.9±0.8a27.7±1.2a0.25±0.03b,c0.58±0.04b64.4±3.2a74.6±2.9
Week 216.8±0.6a,b27.1±1.0a0.30±0.02a,b0.56±0.03b63.4±4.2a,b74.8±5.0
Week 317.8±0.7a29.7±0.8a0.31±0.02a,b0.58±0.03b61.9±2.5a,b72.6±2.2
Week 414.8±0.8a,b25.2±1.1a,b0.23±0.02b,c0.47±0.03b,c57.2±4.3a,b66.7±4.4
Week 814.2±0.6b22.6±0.9b0.20±0.01c0.42±0.02c50.4±2.5b64.1±3.5
Cold acclimation
Initial16.6±0.4b26.9±0.60.188±0.006c0.45±0.01c56.7±3.170.0±3.6
Week 117.7±0.5a,b28.0±0.70.25±0.01b0.50±0.02c57.0±2.073.2±2.6
Week 217.4±0.5a,b27.3±0.50.29±0.03b0.53±0.02b,c63.8±4.779.8±6.2
Week 618.1±0.5a,b29.3±1.00.32±0.02b0.59±0.02b61.9±3.573.4±3.9
Week 1019.2±0.7a29.8±1.10.40±0.02a0.76±0.03a58.5±2.666.8±2.9
  • Data are means ± s.e.m. and are compared between acclimation steps within each experiment at each assay temperature. When values in a column are followed by different letters, they are significantly different (P≤0.05; ANOVA and a Tukey's a posteriori test).