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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
Step	5°C	15°C	5°C	15°C	5°C	15°C
Warm acclimation
Initial	17.1±0.6^a	28.4±0.7^a	0.37±0.02^a	0.74±0.03^a	54.3±3.0^a,b	65.5±3.0
Week 1	16.9±0.8^a	27.7±1.2^a	0.25±0.03^b,c	0.58±0.04^b	64.4±3.2^a	74.6±2.9
Week 2	16.8±0.6^a,b	27.1±1.0^a	0.30±0.02^a,b	0.56±0.03^b	63.4±4.2^a,b	74.8±5.0
Week 3	17.8±0.7^a	29.7±0.8^a	0.31±0.02^a,b	0.58±0.03^b	61.9±2.5^a,b	72.6±2.2
Week 4	14.8±0.8^a,b	25.2±1.1^a,b	0.23±0.02^b,c	0.47±0.03^b,c	57.2±4.3^a,b	66.7±4.4
Week 8	14.2±0.6^b	22.6±0.9^b	0.20±0.01^c	0.42±0.02^c	50.4±2.5^b	64.1±3.5
Cold acclimation
Initial	16.6±0.4^b	26.9±0.6	0.188±0.006^c	0.45±0.01^c	56.7±3.1	70.0±3.6
Week 1	17.7±0.5^a,b	28.0±0.7	0.25±0.01^b	0.50±0.02^c	57.0±2.0	73.2±2.6
Week 2	17.4±0.5^a,b	27.3±0.5	0.29±0.03^b	0.53±0.02^b,c	63.8±4.7	79.8±6.2
Week 6	18.1±0.5^a,b	29.3±1.0	0.32±0.02^b	0.59±0.02^b	61.9±3.5	73.4±3.9
Week 10	19.2±0.7^a	29.8±1.1	0.40±0.02^a	0.76±0.03^a	58.5±2.6	66.8±2.9

	Citrate synthase			Carnitine palmitoyl transferase
Step	5°C	15°C	5°C	15°C	5°C	15°C
Warm acclimation
Initial	17.1±0.6^a	28.4±0.7^a	0.37±0.02^a	0.74±0.03^a	54.3±3.0^a,b	65.5±3.0
Week 1	16.9±0.8^a	27.7±1.2^a	0.25±0.03^b,c	0.58±0.04^b	64.4±3.2^a	74.6±2.9
Week 2	16.8±0.6^a,b	27.1±1.0^a	0.30±0.02^a,b	0.56±0.03^b	63.4±4.2^a,b	74.8±5.0
Week 3	17.8±0.7^a	29.7±0.8^a	0.31±0.02^a,b	0.58±0.03^b	61.9±2.5^a,b	72.6±2.2
Week 4	14.8±0.8^a,b	25.2±1.1^a,b	0.23±0.02^b,c	0.47±0.03^b,c	57.2±4.3^a,b	66.7±4.4
Week 8	14.2±0.6^b	22.6±0.9^b	0.20±0.01^c	0.42±0.02^c	50.4±2.5^b	64.1±3.5
Cold acclimation
Initial	16.6±0.4^b	26.9±0.6	0.188±0.006^c	0.45±0.01^c	56.7±3.1	70.0±3.6
Week 1	17.7±0.5^a,b	28.0±0.7	0.25±0.01^b	0.50±0.02^c	57.0±2.0	73.2±2.6
Week 2	17.4±0.5^a,b	27.3±0.5	0.29±0.03^b	0.53±0.02^b,c	63.8±4.7	79.8±6.2
Week 6	18.1±0.5^a,b	29.3±1.0	0.32±0.02^b	0.59±0.02^b	61.9±3.5	73.4±3.9
Week 10	19.2±0.7^a	29.8±1.1	0.40±0.02^a	0.76±0.03^a	58.5±2.6	66.8±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 posterioritest).

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