TABLE 2.

Resting metabolic rate, maximal metabolic rate after NA, and capacity of NST

Acclimation Temperature	Genotype	n	Resting Metabolic Ratea	Maximal Metabolic Rate after NAa	NST Capacity after NAa
30°C	WT	5	36.65 ± 1.6	75.97 ± 8.9	39.32 ± 7.5
	UCP1-KO	7	41.17 ± 1.3	61.07 ± 4.7	19.90 ± 4.2*
18°C	WT	12	46.23 ± 0.9	175.21 ± 3.6	128.98 ± 3.8
	UCP1-KO	16	46.01 ± 0.9	96.48 ± 2.9*	50.47 ± 2.8*
5°C	WT	5	47.21 ± 2.1	200.77 ± 9.4	153.56 ± 10.1
	UCP1-KO	7	47.52 ± 2.5	107.46 ± 8.3*	59.94 ± 7.0*

NST capacity is the difference between resting metabolic rate and maximum metabolic rate after NA injection. UCP1-KO and WT mice were sequentially acclimated to ambient temperatures of 30°C, 18°C, and 5°C. Values are means ± SEM. Statistically significant differences between the genotypes at each acclimation temperature (P ≤ 0.05) are indicated with *.

^aValues are in milliliters of O₂ per hour.