Conclusion Overall , our findings do not support the presence of a secondary loss of strength following an acute muscle injury , and strongly suggest that strength , on average , recovers steadily over the first 3 days post-injury
Background An immediate loss of strength follows virtually all types of muscle injury but there is debate whether the initial strength loss is maximal or if a secondary loss of strength occurs during the first 3 days post-injury .
Objective The objective of this analysis was to conduct a systematic review and meta- analysis of the research literature to determine if a secondary loss of strength occurs after an injurious initiating event .
Effects of dietary supplementation with vitamins C and E on muscle function during and after eccentric contractions in humans
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 r and omly 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 question naires 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
Conclusion Overall , our findings do not support the presence of a secondary loss of strength following an acute muscle injury , and strongly suggest that strength , on average , recovers steadily over the first 3 days post-injury
Background An immediate loss of strength follows virtually all types of muscle injury but there is debate whether the initial strength loss is maximal or if a secondary loss of strength occurs during the first 3 days post-injury .
Objective The objective of this analysis was to conduct a systematic review and meta- analysis of the research literature to determine if a secondary loss of strength occurs after an injurious initiating event .