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 .
Torque loss induced by repetitive maximal eccentric contractions is marginally influenced by work-to-rest ratio
The influence of different work-to-rest ( W : R ) ratios during fatigue induced by maximal eccentric contractions is unknown . The present study sought to exp and the underst and ing of the task-dependent nature of eccentric contractions , and the associated fatigue , during exercise and acute as well as extended recovery periods . Using a Biodex multi-joint dynamometer , the ankle dorsiflexors of eight men [ 26 ( 4 ) years ] were fatigued with 150 maximal eccentric contractions . Set structure was manipulated such that one leg performed 3 sets of 50 repetitions ( short rest protocol , SRP ) , and the other leg performed 15 sets of 10 repetitions ( long rest protocol , LRP ) . A 1-min rest interval separated each set , which result ed in 2 and 14 min of total rest for the SRP and the LRP , respectively . At fatigue , the SRP demonstrated a marginally greater loss of average peak eccentric torque than the LRP ( P<0.05 ) . In the acute period following fatigue , isometric peak torque loss and the degree of low-frequency fatigue ( LFF ) were not recovered ( P<0.05 ) and were equivalent for both protocol s. Significant impairment of both eccentric and isometric torque was persistent and equal for each protocol at 96 h of recovery ( P<0.05 ) . These findings suggest that the W : R ratio has a modest influence on the fatigue ( torque loss ) induced by maximal eccentric contractions , but maximal isometric torque during recovery and LFF are insensitive to changes in total rest time
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 .