Neuromuscular electrical stimulation increases muscle protein synthesis in elderly type 2 diabetic men

作者：Wall Benjamin T; Dirks Marlou L; Verdijk Lex B; Snijders Tim; Hansen Dominique; Vranckx Pascal; Burd Nicholas A; Dendale Paul; van Loon Luc J C^*

来源：American Journal of Physiology - Endocrinology And Metabolism, 2012, 303(5): E614-E623.

DOI：10.1152/ajpendo.00138.2012

• aging
• disuse
• neuromuscular electrical stimulation
• type 2 diabetes

Wall BT, Dirks ML, Verdijk LB, Snijders T, Hansen D, Vranckx P, Burd NA, Dendale P, van Loon LJ. Neuromuscular electrical stimulation increases muscle protein synthesis in elderly type 2 diabetic men. Am J Physiol Endocrinol Metab 303: E614-E623, 2012. First published June 26, 2012; doi:10.1152/ajpendo.00138.2012.-Physical activity is required to attenuate the loss of skeletal muscle mass with aging. Short periods of muscle disuse, due to sickness or hospitalization, reduce muscle protein synthesis rates, resulting in rapid muscle loss. The present study investigates the capacity of neuromuscular electrical stimulation (NMES) to increase in vivo skeletal muscle protein synthesis rates in older type 2 diabetes patients. Six elderly type 2 diabetic men (70 +/- 2 yr) were subjected to 60 min of one-legged NMES. Continuous infusions with L-[ring-C-13(6)]phenylalanine were applied, with blood and muscle samples being collected regularly to assess muscle protein synthesis rates in both the stimulated (STIM) and nonstimulated control (CON) leg during 4 h of recovery after NMES. Furthermore, mRNA expression of key genes implicated in the regulation of muscle mass were measured over time in the STIM and CON leg. Muscle protein synthesis rates were greater in the STIM compared with the CON leg during recovery from NMES (0.057 +/- 0.008 vs. 0.045 +/- 0.008%/h, respectively, P %26lt; 0.01). Skeletal muscle myostatin mRNA expression in the STIM leg tended to increase immediately following NMES compared with the CON leg (1.63- vs. 1.00-fold, respectively, P = 0.07) but strongly declined after 2 and 4 h of recovery in the STIM leg only. In conclusion, this is the first study to show that NMES directly stimulates skeletal muscle protein synthesis rates in vivo in humans. NMES likely represents an effective interventional strategy to attenuate muscle loss in elderly individuals during bed rest and/or in other disuse states.

• 出版日期2012-9