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 recovery modes after knee extensor muscles eccentric contractions.
PURPOSE This study aim ed to evaluate the benefit of using low-intensity running or electromyostimulation ( EMS ) to hasten the recovery process from eccentric-contraction-induced injury . METHODS Before and 30 min , 24 h , 48 h , and 96 h after a one-legged downhill run , electrical stimulations were applied to the femoral nerve of healthy volunteers . Superimposed twitches were delivered during isometric maximal voluntary contraction ( MVC ) to determine the voluntary activation level ( % VA ) . For 4 d after the exercise , each subject performed either ( i ) 30 min of running at 50 % VO2max , ( ii ) 30 min of low-frequency EMS on the lower limb extensor muscles , or ( iii ) passive recovery . RESULTS Recovery time courses of the different variables did not differ significantly among the three experimental conditions . MVC decreased 30 min after the exercise and did not recover thereafter ( P < 0.001 ) . Percent VA was depressed after the exercise ( P < 0.05 ) but did not contribute to MVC decrement thereafter . Mechanical responses to 80- and 20-Hz stimulation ( P80 and P20 , respectively ) were significantly reduced over time ( P < 0.01 and P < 0.001 , respectively ) . Interestingly , MVC , P20 , and P80 decrements were not statistically different ( -9.6 + /- 14.5 % , -13.2 + /- 14.2 % , and -12.3 + /- 11.3 % , respectively ) at 48 h , and the P20.P80(-1 ) ratio showed complete recovery at this time . CONCLUSIONS The different recovery modes had no significant effect on the recovery time course of contractile properties . The prolonged torque loss is mainly due to peripheral alterations . Our results suggest that an alteration of the excitation-contraction coupling might be involved during the first 2 d after the eccentric exercise . From 2 to 4 d , damage to force-generating structures could account for the remaining torque deficit
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 .