Fig. 1. Glucose increases glucose uptake in contracting myotubes. After 48 hours in serum-free medium containing 5 mM glucose, 2-deoxyglucose (2-DG) uptake was measured after a 30 minute incubation of the cells with 5 mM glucose (G5), 25 mM glucose (G25) or 25 mM mannitol. Results are the means±s.e.m of 10-13 independent experiments. ^*P<0.05 versus G5.