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 .
Eccentric exercise-induced muscle damage dissociates the lactate and gas exchange thresholds
Abstract We tested the hypothesis that exercise-induced muscle damage would increase the ventilatory ( [ Vdot ] E ) response to incremental/ramp cycle exercise ( lower the gas exchange threshold ) without altering the blood lactate profile , thereby dissociating the gas exchange and lactate thresholds . Ten physically active men completed maximal incremental cycle tests before ( pre ) and 48 h after ( post ) performing eccentric exercise comprising 100 squats .  Pulmonary gas exchange was measured breath-by-breath and fingertip blood sample d at 1-min intervals for determination of blood lactate concentration . The gas exchange threshold occurred at a lower work rate ( pre : 136 ± 27 W ; post : 105 ± 19 W ; P < 0.05 ) and oxygen uptake ( [Vdot]O2 ) ( pre : 1.58 ± 0.26 litres · min−1 ; post : 1.41 ± 0.14 litres · min−1 ; P < 0.05 ) after eccentric exercise . However , the lactate threshold occurred at a similar work rate ( pre : 161 ± 19 W ; post : 158 ± 22 W ; P > 0.05 ) and [Vdot]O2 ( pre : 1.90 ± 0.20 litres · min−1 ; post : 1.88 ± 0.15 litres · min−1 ; P > 0.05 ) after eccentric exercise . These findings demonstrate that exercise-induced muscle damage dissociates the [ Vdot ] E response to incremental/ramp exercise from the blood lactate response , indicating that [ Vdot ] E may be controlled by additional or altered neurogenic stimuli following eccentric exercise . Thus , due consideration of prior eccentric exercise should be made when using the gas exchange threshold to provide a non-invasive estimation of the lactate threshold
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 .