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Increased lipid oxidation is related to insulin resistance. Some of the enhanced lipid utilization may be derived from intramuscular sources. We studied muscle triglyceride (mTG) concentration and its relationship to insulin sensitivity in 10 healthy men (age 29 +/- 2 years, BMI 23.3 +/- 0.6 kg/m2) and 17 men with insulin-dependent diabetes mellitus (IDDM) (age 30 +/- 2 years, BMI 22.8 +/- 0.5 kg/m2, diabetes duration 14 +/- 2 years, HbA1c 7.7 +/- 0.3%, insulin dose 48 +/- 3 U/day). Insulin sensitivity was measured with a 4h euglycaemic (5 mmol/l) hyperinsulinaemic (1.5 mU or 9 pmol x kg(-1) x min[-1]) clamp accompanied by indirect calorimetry before and at the end of the insulin infusion. A percutaneous biopsy was performed from m. vastus lateralis for the determination of mTG. At baseline the IDDM patients had higher glucose (10.2 +/- 0.9 vs 5.6 +/- 0.1 mmol/l, p &lt; 0.001), insulin (40.3 +/- 3.2 vs 23.2 +/- 4.2 pmol/l, p &lt; 0.01), HDL cholesterol (1.28 +/- 0.06 vs 1.04 +/- 0.03 mmol/l, p &lt; 0.01) and mTG (32.9 +/- 4.6 vs 13.6 +/- 2.7 mmol/kg dry weight, p &lt; 0.01) concentrations than the healthy men, respectively. The IDDM patients had lower insulin stimulated whole body total (-25%, p &lt; 0.001), oxidative (-18%, p &lt; 0.01) and non-oxidative glucose disposal rates (-43%, p &lt; 0.001), whereas lipid oxidation rate was higher in the basal state (+ 44%, p &lt; 0.01) and during hyperinsulinaemia (+283%, p &lt; 0.05). mTG concentrations did not change significantly during the clamp or correlate with insulin stimulated glucose disposal. In healthy men mTG correlated positively with lipid oxidation rate at the end of hyperinsulinaemia (r = 0.75, p &lt; 0.05).

Intramuscular triglyceride content is increased in IDDM