Table 2.

Mixed-muscle protein and muscle mitochondrial protein d₉-leucine enrichment

	Biopsy time
	120 min	300 min	540 min
Mixed-muscle protein (MPE)
Lean subjects	0.007 ± 0.001	0.017 ± 0.001#	0.034 ± 0.002&
Subjects with obesity	0.006 ± 0.001	0.014 ± 0.001#	0.034 ± 0.004&
Mitochondrial protein (MPE)
Lean subjects	0.011 ± 0.001	0.023 ± 0.001#	0.045 ± 0.004&
Subjects with obesity	0.010 ± 0.001	0.019 ± 0.001#	0.042 ± 0.002&

Values represent the mean ± SEM. Biopsy time reflects the time after the start of leucine tracer infusion (see text); 120 and 300 min correspond to fasted-state plasma amino acid concentrations, whereas 540 min corresponds to elevated plasma amino acid concentrations; MPE, molar percent excess. There were significant time (P ≤ 0.05) but not group (P > 0.05) main effects for both mixed-muscle and mitochondrial proteins.

^#P ≤ 0.05 versus 120 min;

^&P ≤ 0.05 versus both 120 and 300 min.