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A: plasma enrichment of [2H5]phenylalanine increased over time (P < 0.001) but was not different between saline and propranolol. B: β-AR blockade (propranolol) during cycling decreased skeletal muscle fractional synthesis rate (FSR) for subsarcolemmal mitochondrial (Mito), but not myofibrillar (Myo) or sarcoplasmic (Sarc), proteins. *P < 0.05.
