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 .
Damage to human muscle from eccentric exercise after training with concentric exercise.
1 . It is known that a period of eccentric exercise provides protection against damage to muscle from subsequent eccentric exercise . Here we ask , does concentric exercise do the opposite , make muscle more prone to damage ? 2 . The triceps surae muscle group of one leg in each of eight human subjects was subjected to 30 min of concentric exercise per day , for 5 days . At the end of the training period there was a small but significant increase in passive torque in the exercised muscle ( P < 0.05 ) , with no changes in the untrained muscle . 3 . After a single period of eccentric exercise , angle-torque curves for muscles of both legs shifted in the direction of longer muscle lengths , suggestive of an increase in series compliance . The shift in the concentrically trained muscle was significantly greater over the first 48 h post-exercise ( P < 0 . 05 ) . 4 . The volume of the trained leg increased significantly more than the untrained leg for five subjects over 72 h post-exercise ( P < 0.05 ) . Peak torque fell , passive stiffness increased and both muscles became sore , but with no significant differences between the two legs . 5 . It is concluded that a period of concentric exercise increases the susceptibility of muscle to changes associated with the damage from eccentric exercise
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 .