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 .
PROTECTION AGAINST MUSCLE DAMAGE FOLLOWING FIFTY DROP JUMPS CONFERRED BY TEN DROP JUMPS
This study investigated whether 10 drop jumps ( DJs ) would confer protective effect against muscle damage and soreness in a subsequent bout of 50 DJs . Sixteen men were r and omly placed into either a group performing 1 set of 10 DJs followed by 5 sets of 10 DJs ( 10–50 , n = 8) or another group performing 2 bouts of 5 sets of 10 DJs ( 50–50 , n = 8) separated by 2 weeks . The DJs were performed from a box height of 0.6 m , with a 10-second interval between jumps and a 1-minute rest between sets . Jump height , peak vertical ground reaction force , ground contact time , and heart rate during DJs were measured , and blood lactate concentration was assessed before and immediately after DJs . Changes in maximal isometric ( ISO ) and isokinetic concentric torque ( CON ) , vertical jump , muscle soreness , and plasma creatine kinase activity before , immediately after , and at 1 , 24 , 48 , and 72 hours following exercise were compared between groups for the first and second bouts and between the bouts by a 2-way repeated- measures analysis of variance . Changes in ISO , CON , vertical jump , and muscle soreness were significantly ( p < 0.05 ) smaller for 10 DJs compared with 50 DJs ; however , no signifi- ca nt differences in the measures between groups were evident following the second bout . The changes in the measures following 50 DJs in the 10–50 group were significantly ( p < 0.05 ) smaller than those following the first bout of the 50–50 group . These results suggest that 10 DJs and 50 DJs conferred the same magnitude of protective effect against muscle damage by 50 DJs
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 .