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[RC] C/E - Ridecamp Guest

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Authors A Shafat, P Butler, RL Jensen, AE Donnelly
Title   Effects of dietary supplementation with vitamins C and E on muscle 
function during and after eccentric contractions in humans
Full source     European Journal of Applied Physiology, 2004, Vol 93, Iss 1-2, 
pp 196-202

Reactive oxygen species may contribute to exercise-induced skeletal muscle 
damage, and antioxidants may protect against such damage. This study examined 
the effectiveness of prophylactic supplementation with vitamins C and E on 
symptoms of muscle damage in a single blind, two-group study design. Twelve 
male volunteers were randomly assigned to either treatment or control groups. 
The treatment group received 500 mg of vitamin C and 1,200 IU of 
alpha-tocopherol daily and the control group received glucose placebo for 37 
days. After 30 days of treatment, volunteers performed 300 maximal eccentric 
contractions of the knee extensor muscles of one leg. Maximal voluntary 
isometric contraction force and electrically evoked force at a frequency of 20 
Hz and 50 Hz were recorded before and after exercise, and on days 1, 2 and 7 
after exercise. Muscle soreness questionnaires were completed and muscle girth 
recorded at the same time points. Eccentric contractile torque and work during 
the bout declined significantly in both groups (P<0.001), but this decline was 
smaller in the vitamin-supplemented group (P<0.05). Maximal voluntary isometric 
contraction force and 20:50 Hz force ratio declined significantly after 
exercise in both groups (P<0.01), but the decline was smaller in the treatment 
group on days 1 and 2 post-exercise (P<0.05). Both groups experienced similar 
significant muscle soreness and swelling after exercise. These data suggest 
that prior supplementation with dietary antioxidants ameliorates muscle 
functional decrements subsequent to eccentric muscle contraction.




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