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 .
Effect of Slow-Velocity Lengthening Contractions on Muscle Damage Induced by Fast-Velocity Lengthening Contractions
Chapman , DW , Newton , MJ , McGuigan , MR , and Nosaka , K. Effect of slow-velocity lengthening contractions on muscle damage induced by fast-velocity lengthening contractions . J Strength Cond Res 25(1 ) : 211 - 219 , 2011-This study tested the hypothesis that the first exercise bout consisting of slow-velocity ( 30 ° ·s−1 ) maximal lengthening contractions would not affect muscle damage in a subsequent bout consisting of fast-velocity ( 210 ° ·s−1 ) lengthening contractions . Eighteen men were r and omly assigned into either a repeated bout group ( n = 10 ) or control group ( n = 8) . The repeated bout group performed 2 bouts of exercise consisting of 210 maximal lengthening contractions of the elbow flexors separated by 14 days at a velocity of 30 ° ·s−1 for the first and 210 ° ·s−1 for the second bout . The control group performed a single bout of the fast-velocity exercise . Changes in maximal isometric strength , range of motion ( ROM ) , upper-arm circumference , muscle thickness , muscle soreness , serum creatine kinase , and lactate dehydrogenase activities were measured before , immediately after , and 24 to 96 hours after exercise . The repeated bout group showed significantly ( p < 0.05 ) smaller changes in all criterion measures except for muscle soreness after the fast-velocity exercise compared with the control group . A significant ( p < 0.05 ) difference was evident only for ROM between the slow- and fast-velocity bouts of the repeated bout group . These results suggest that slow-velocity exercise  reduced muscle damage induced by fast-velocity exercise , although the reduction was not large
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 .