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Endurance capacity in maturing mdx mice is markedly enhanced by combined voluntary wheel running and green tea extract

Departments of ¹Human Nutrition, Foods and Exercise, and ²Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia; and ³Biological Sciences Department, California State Polytechnic University, Pomona, California

Submitted 11 January 2008 ; accepted in final form 24 June 2008

Duchenne muscular dystrophy is characterized by the absence of dystrophin from muscle cells. Dystrophic muscle cells are susceptible to oxidative stress. We tested the hypothesis that 3 wk of endurance exercise starting at age 21 days in young male mdx mice would blunt oxidative stress and improve dystrophic skeletal muscle function, and these effects would be enhanced by the antioxidant green tea extract (GTE). In mice fed normal diet, average daily running distance increased 300% from week 1 to week 3, and total distance over 3 wk was improved by 128% in mice fed GTE. Running, independent of diet, increased serum antioxidant capacity, extensor digitorum longus tetanic stress, and total contractile protein content, heart citrate synthase, and heart and quadriceps β-hydroxyacyl-CoA dehydrogenase activities. GTE, independent of running, decreased serum creatine kinase and heart and gastrocnemius lipid peroxidation and increased gastrocnemius citrate synthase activity. These data suggest that both endurance exercise and GTE may be beneficial as therapeutic strategies to improve muscle function in mdx mice.

antioxidant capacity; muscular dystrophy; oxidative stress

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