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 .
Time Course of Changes in Performance and Inflammatory Responses After Acute Plyometric Exercise
Chatzinikolaou , A , Fatouros , IG , Gourgoulis , V , Avloniti , A , Jamurtas , AZ , Nikolaidis , MG , Douroudos , I , Michailidis , Y , Beneka , A , Malliou , P , Tofas , T , Georgiadis , I , M and alidis , D , and Taxildaris , K. Time course of changes in performance and inflammatory responses after acute plyometric exercise . J Strength Cond Res 24(5 ) : 1389 - 1398 , 2010-The objectives of the present investigation were to study the inflammatory and performance responses after an acute bout of intense plyometric exercise during a prolonged recovery period . Participants were r and omly assigned to either an  experimental group ( P , n = 12 ) that performed intense plyometric exercises or a  control group ( C , n = 12 ) that rested . The delayed onset of muscle soreness ( DOMS ) , knee range of motion ( KROM ) , creatine kinase ( CK ) and lactate dehydrogenase ( LDH ) activities , white blood cell count , C reactive protein ( CRP ) , uric acid ( UA ) , cortisol , testosterone , IL-6 , IL-1b strength ( isometric and isokinetic ) , and countermovement ( CMJ ) and static ( SJ ) jumping performance were measured at rest , immediately postexercise and at 24 , 48 , 72 , 96 , and 120 hours of recovery . Lactate was measured at rest and postexercise . Strength remained unchanged throughout recovery , but CMJ and SJ declined ( p < 0.05 ) by 8 - 20 % . P induced a marked rise in DOMS , CK , and LDH ( peaked 24 - 48 hours postexercise ) and a KROM decline . An acute-phase inflammatory response consisting of leukocytosis ( postexercise and at 24 hours ) , an IL-6 , IL-1b , CRP , and cortisol elevation ( during the first 24 hours of recovery ) and a delayed increase of UA ( peaked at 48 hours ) and testosterone ( peaked at 72 hours ) was observed in P. The results of this investigation indicate that performing an acute bout of intense plyometric exercise may induce a short-term muscle damage and marked but transient inflammatory responses . Jumping performance seems to deteriorate for as long as 72 hours postexercise , whereas strength appears to remain unchanged . The acute-phase inflammatory response after a plyometric exercise protocol appears to follow the same pattern as in other exercise models . These results clearly indicate the need of sufficient recovery between successive plyometric exercise training sessions
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 .