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Impaired insulin stimulation of muscular ATP production in patients with http://www.selleckchem.com/products/bay-57-1293.html type 1 diabetes. J Intern Med 2011; 269: 189�C199. Objective.? In type 2 diabetic patients and their first-degree relatives, insulin resistance (IR) is associated with impairment of insulin-stimulated myocellular glucose-6-phosphate (g6p) and unidirectional flux through ATP synthase (fATP), suggesting the presence of inherited abnormal mitochondrial oxidative fitness. We hypothesized that patients with long-standing type 1 diabetes may also exhibit insulin resistance as well as lower fATP. Design.? This single-centre trial was registered at ClinicalTrials.gov (NCT00481598). Subjects.? We included eight nonobese type 1 diabetic patients (mean diabetes duration: 17?years) with near-target glycaemic control [haemoglobin A1c (HbA1c): 6.8?��?0.4%] during treatment with continuous subcutaneous insulin infusion pumps and eight healthy volunteers (HbA1c: 5.4?��?0.2%) of comparable age, body mass and level of physical activity. Outcome measures.? Myocellular fATP, g6p and intramyocellular lipid content (IMCL) were measured with 1H/31P magnetic resonance spectroscopy during fasting and hyperinsulinaemic�Ceuglycaemic clamp tests. Results.? Fasting fATP, g6p and IMCL did not differ between groups. During stimulation http://www.selleckchem.com/products/gsk2126458.html by insulin, type 1 diabetic patients exhibited ?50% (P? http://www.selleck.cn/products/CAL-101.html glucose disposal along with ?42% (P?=?0.003) lower intramyocellular g6p and ?25% (P?=?0.024) lower fATP. Insulin-stimulated fATP correlated positively with whole-body insulin sensitivity (R?=?0.706, P?=?0.002) and negatively with HbA1c (R?=??0.675, P?=?0.004). Conclusions.? Despite documented near-target glycaemic control for 1?year, nonobese patients with long-standing type 1 diabetes can exhibit insulin resistance. This associates with lower insulin-stimulated flux through muscular ATP synthase which could result from glucose toxicity. Skeletal muscle is responsible for the majority of insulin-stimulated whole-body glucose disposal [1] which has been related to mitochondrial oxidative phosphorylation [2, 3]. Impairment of insulin-stimulated whole-body glucose disposal (i.e. insulin resistance) results from reduced insulin-stimulated glucose transport or phosphorylation and glycogen synthesis as indicated by lower increases in glucose-6-phosphate (g6p) and glycogen in skeletal muscle.