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 .
Muscle fatigue and pain after eccentric contractions at long and short length.
1 . The effect of muscle length on the development of muscle pain and fatigue has been studied . 2 . Eight normal young adults performed maximal eccentric contractions of the elbow flexors . The muscles of one arm were exercised at short length , and the contralateral muscle at long length . Each contraction lasted approximately 1 s , and was repeated once every 10 s for 30 min . 3 . Muscle strength and frequency-force characteristics were measured from isometric contractions before , immediately after and at 24 h intervals for the next 4 days . Muscle tenderness was assessed daily . 4 . The muscle strength was reduced by approximately 10 % by exercise at short length , and by 30 % by exercise at long length . 5 . The 20:100 ratio ( force generated by stimulation at 20 Hz/force generated at 100 Hz ) fell by 30 % after exercise at short length and had recovered after 24 h. Exercise at long length reduced this ratio by 65 % and the muscles had not fully recovered 4 days later . 6 . Muscle pain developed after both exercise regimens , but was slightly worse after that at long length . 7 . It is concluded that there is a length-dependent component in the development of pain and fatigue after eccentric exercise , which had previously been thought to be caused solely by high force generation
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 .