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.: Home > International Journal of Medical Sciences > 2007 > Volume 4 Number 1 > Naomi Brooks1, Jennifer E. Layne1, Patricia L. Gordon1 3, Ronenn Roubenoff1 2, Miriam E. Nelson1 2 4, Carmen Castaneda-Sceppa1 2

Strength training improves muscle quality and insulin sensitivity in Hispanic older adults with type 2 diabetes

Naomi Brooks1, Jennifer E. Layne1, Patricia L. Gordon1 3, Ronenn Roubenoff1 2, Miriam E. Nelson1 2 4, Carmen Castaneda-Sceppa1 2
1. Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston MA, USA. 2. The Friedman School of Nutrition Science and Policy, Tufts University, Boston MA, USA. 3. Department of Physiological Nursing, University of California, San Francisco, CA, USA. 4. John Hancock Center for Physical Activity and Nutrition, Tufts University, Boston, MA, USA
Abstract :

Hispanics are at increased risk of morbidity and mortality due to their high prevalence of diabetes and poor glycemic control. Strength training is the most effective lifestyle intervention to increase muscle mass but limited data is available in older adults with diabetes. We determined the influence of strength training on muscle quality (strength per unit of muscle mass), skeletal muscle fiber hypertrophy, and metabolic control including insulin resistance (Homeostasis Model Assessment –HOMA-IR), C-Reactive Protein (CRP), adiponectin and Free Fatty Acid (FFA) levels in Hispanic older adults. Sixty-two community-dwelling Hispanics (>55 y) with type 2 diabetes were randomized to 16 weeks of strength training plus standard care (ST group) or standard care alone (CON group). Skeletal muscle biopsies and biochemical measures were taken at baseline and 16 weeks. The ST group show improved muscle quality (mean±SE: 28±3) vs CON (-4±2, p<0.001) and increased type I (860±252ىm2) and type II fiber cross-sectional area (720±285ىm2) compared to CON (type I: -164±290ىm2, p=0.04; and type II: -130±336ىm2, p=0.04). This was accompanied by reduced insulin resistance [ST: median (interquartile range) -0.7(3.6) vs CON: 0.8(3.8), p=0.05]; FFA (ST: -84±30ىmol/L vs CON: 149±48ىmol/L, p=0.02); and CRP [ST: -1.3(2.9)mg/L vs CON: 0.4(2.3)mg/L, p=0.05]. Serum adiponectin increased with ST [1.0(1.8)ىg/mL] compared to CON [-1.2(2.2)ىg/mL, p<0.001]. Strength training improved muscle quality and whole-body insulin sensitivity. Decreased inflammation and increased adiponectin levels were related with improved metabolic control. Further studies are needed to understand the mechanisms associated with these findings. However, these data show that strength training is an exercise modality to consider as an adjunct of standard of care in high risk populations with type 2 diabetes.

Keywords :
diabetes, strength training, Hispanic, skeletal muscle, insulin sensitivity

Date Deposited : 28 Jul 2011 12:56

Last Modified : 28 Jul 2011 12:56

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Volume 4, Number 1, - 2007 , ISSN 1449-1907

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