Conclusions Our results demonstrate that the existence of a relationship between training load and injury continues to be well supported in the literature and is strongest for subjective internal training load .
The directionality of this relationship appears to depend on the type and timeframe of load measured
Background The relationship between training load and musculoskeletal injury is a rapidly advancing area of research in need of an up date d systematic review .
Increase in ACL and PCL injuries after implementation of a new professional football league
Abstract Purpose In the season 2008–2009 , a third professional football league was established in Germany . This study analysed the influence of increased training and playing intensity on severe knee injuries in football players . Methods In a prospect i ve controlled one-season trial , injury incidence and injury patterns of players of the newly established professional football league were analysed , particularly with regard to ruptures of the anterior ( ACL ) and posterior ( PCL ) cruciate ligaments . Players of the highest amateur level served as a control group . Results Four hundred and eight players of 24 teams were allocated to two groups . The overall training exposure was significantly ( p < 0.001 ) higher in the new professional league ( 335.3 h per player ) than at the amateur level ( 286.6 h per player ) . Players at both levels showed similar overall injury rates and injury patterns . However , players in the professional league had a significantly higher ( p = 0.04 ) incidence of ACL and PCL injuries , than players at the amateur level . More than 90 % of all ACL and PCL ruptures in both groups were sustained by players , who had played at least one level lower in the previous season . In addition , injuries of players who had sustained repeat injuries over the season were more severe . Conclusion The introduction of a new professional football league increased the training and playing intensity of players as well as the number of ACL and PCL ruptures . A specific injury prevention concept , particularly for players facing rapidly increasing training and playing intensity , seems to be m and atory . Level of evidence Prospect i ve controlled cohort study , Level II
Conclusions Our results demonstrate that the existence of a relationship between training load and injury continues to be well supported in the literature and is strongest for subjective internal training load .
The directionality of this relationship appears to depend on the type and timeframe of load measured
Background The relationship between training load and musculoskeletal injury is a rapidly advancing area of research in need of an up date d systematic review .