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 .
Injury risk is different in team and individual youth sport.
OBJECTIVES This study compared sports injury incidence in young high-level athletes from various team and individual sports and investigated if sport participation patterns are linked to injuries . DESIGN Prospect i ve cohort follow-up . METHODS Pupils from a public sports school ( 12 - 19 years ) were recruited over two separate school years ( 2008 - 2009 : 42 weeks , n=199 athletes ; 2009 - 2010 : 40 weeks , n=89 athletes ) .  Training and competition volume and intensity were recorded via a personal sports diary .  Sports injuries ( time-loss definition ) were registered by medical staff members using a st and ardized question naire . RESULTS Injury incidence was significantly higher in team compared with individual sports ( 6.16 versus 2.88 injuries/1000h , respectively ) , as a result of a higher incidence of both traumatic ( RR=2.17 ; CI95%=1.75 - 2.70 ; p<0.001 ) , and overuse injuries ( RR=2.06 ; CI95%=1.46 - 2.91 ; p<0.001 ) . A Cox proportional hazards regression revealed that team sports participation had a hazard ratio of 2.00 ( CI95%=1.49 - 2.68 ; p<0.001 ) compared to individual sports , with additionally previous injury being a risk and age a protective factor . The number of competitions per 100 days was significantly higher in team sports , whereas the number of intense training sessions per 100 days was significantly lower . In team sports , the number of competitions per 100 days was positively associated with injuries ( HR=1.072 ; CI95 % [ 1.033 ; 1.113 ] ; p<0.001 ) , while in individual sports the number of competitions per 100 days had a protective effect ( HR=0.940 ; CI95 % [ 0.893 ; 0.989 ] ; p=0.017 ) . CONCLUSIONS Team sports participation entailed a higher injury risk , whatever the injury category . Further research should eluci date the role of characteristics related to sport participation in injury causation
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 .