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 .
Exercise-induced skeletal muscle damage and adaptation following repeated bouts of eccentric muscle contractions.
Repeated bouts of eccentric muscle contractions were used to examine indirect indices of exercise-induced muscle damage and adaptation in human skeletal muscle . Twenty-four subjects ( 18 females , 6 males ) aged 20.0 + /- 1.4 years ( mean + /- S.D. ) performed an initial bout of either 10 ( n = 7 ) , 30 ( n = 9 ) or 50 ( n = 8) maximum voluntary eccentric contractions of the knee extensors , followed by a second bout of 50 contractions 3 weeks later using the same leg . Muscle soreness was elevated after all bouts ( P < 0.05 , Wilcoxon test ) , although the initial bout reduced the soreness associated with the second bout . Force loss and a decline in the 20:100 Hz percutaneous electrical myostimulation force ratio were observed after all exercise bouts ( P < 0.01 ) . Serum creatine kinase activity was elevated following the initial bouts of 30 and 50 repetitions ( P < 0.01 ) , but there was no increase following 10 repetitions . No increase in serum creatine kinase activity was observed in any group following the second bout of contractions ( P > 0.05 ) . We conclude that skeletal muscle adaptation can be brought about by a single bout of relatively few eccentric muscle contractions . Increasing the number of eccentric muscle repetitions did not result in an increased prophylactic effect on skeletal muscle
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 .