Evaluation of skeletal muscle mass indices, assessed by bioelectrical impedance, as indicators of insulin resistance in patients with type 2 diabetes.

This was a retrospective record review, so it can show association but cannot show that muscle mass caused or improved insulin resistance. Insulin resistance was estimated only from fasting glucose and insulin using HOMA-IR, not the clamp method. Muscle mass was measured by bioelectrical impedance, and hydration status was not checked, which can affect body composition readings. Participants were hospitalised for diabetes education and care, so some may have had acute glucose control problems. Older men did not show the same ASMI association, so the finding is not uniform across groups.

The paper does not state a study funder. An author declared honoraria, clinical research grants, and scholarship grants from companies, including ARKRAY, Boehringer Ingelheim, MSD, Novo Nordisk, Ono Pharmaceutical, Taisho, Takeda, Bayer Yakuhin, TERUMO, Kao, Becton Dickinson, Johnson & Johnson, and Sumitomo Dainippon Pharma.

Do not treat the RTSM cutoffs as a clinical diagnostic rule or conclude that raising muscle mass will lower insulin resistance. The study was observational, used bioelectrical impedance without checking hydration, and did not test exercise or nutrition interventions.