Maintenance of contractile properties despite impaired skeletal muscle oxidative metabolism in diet‐induced obesity.

TL;DRAbstract

Diet‐induced obesity (DIO) is increasing in prevalence among youth; a time where robust muscle growth occurs. We hypothesized that consumption of a high fat diet (HFD) in early adulthood would negatively impact mouse muscle metabolism and contractile function. HFD (~60% kcal fat for 8 weeks) induced an obese and insulin resistant phenotype with reduced relative muscle mass (72 ± 1.9%) compared to control. Using isolated single muscle fibers for analysis, HFD induced a significant impairment in palmitate and glucose oxidation (72.8 ± 6.6% and 61.8 ± 9.1% of control respectively). This novel technique was validated in intact muscle. Impaired insulin responses were noted for glucose metabolism and glycogen synthesis in HFD muscle vs. control, while glucose and palmitate uptake was not altered between groups. Preliminary RT‐PCR results demonstrate no difference in CPT‐1, PGC‐1α, PPARα or UCP‐2 expression. Further gene and protein analysis into the mechanisms underlying changes in fat uptak

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