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 .
Branched-chain amino acid ingestion can ameliorate soreness from eccentric exercise.
PURPOSE The purpose of this study was to examine the role of branched-chain amino acid ( BCAA ) supplementation during recovery from intense eccentric exercise . METHODS Twenty-four non-weight-trained males were assigned to one of two groups : one group ( supplementary , SUP ) ingested BCAA beverages ( n = 12 ) ; the second group ( placebo , PLA ) ingested artificially flavored water ( n = 12 ) . Diet was controlled throughout the testing period to match habitual intake . The eccentric exercise protocol consisted of 12 x 10 repetitions of unilateral eccentric knee extension exercise at 120 % concentric one repetition maximum . On the day of the exercise , supplements were consumed 30 min before exercise , 1.5 h after exercise , between lunch and dinner , and before bed . On the following 2 d , four supplements were consumed between meals . Muscle soreness , muscle function , and putative blood markers of muscle damage were assessed before and after ( 1 , 8 , 24 , 48 , and 72 h ) exercise . RESULTS Muscle function decreased after the eccentric exercise ( P < 0.0001 ) , but the degree of force loss was unaffected by BCAA ingestion ( 51 % + /- 3 % with SUP vs -48 % + /- 7 % with PLA ) . A decrease in flexed muscle soreness was observed in SUP compared with PLA at 48 h ( 21 + /- 3 mm vs 32 + /- 3 mm , P = 0.02 ) and 72 h ( 17 + /- 3 mm vs 27 + /- 4 mm , P = 0.038 ) . Flexed muscle soreness , expressed as area under the curve , was lower in SUP than in PLA ( P = 0.024 ) . CONCLUSIONS BCAA supplementation may attenuate muscle soreness , but it does not ameliorate eccentric exercise-induced decrements in muscle function or increases in reputed blood markers of muscle damage , when consumed before exercise and for 3 d after an eccentric exercise bout
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 .