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 history as a risk factor for incident injury in youth soccer
Objectives : To determine if athletes with a self reported history of previous injury have a higher incident injury rate than athletes without a self reported injury history . Methods : A prospect i ve cohort study of Classic League soccer players playing at the level under 12 through under 18 .  Injury history forms were mailed to all registering Classic League soccer players in the North Carolina Youth Soccer Association during 1997–2000 ( n = 7000 ) ; 1483 ( 19 % ) returned the baseline question naire and were followed up for injuries . Results : There were 5139 player-seasons of follow up and an estimated 171 957 athlete-exposures . More than half self reported an injury history ( 59.7 % ) . Overall , the unadjusted incidence rate was 4.6 ( 95 % confidence interval ( CI ) 4.3 to 4.9 ) incident injuries per 1000 athlete-exposures . Multivariate generalised Poisson regression modelling indicated that players with one previous injury had a twofold greater risk of incident injury ( IRR = 2.6 ; 95 % CI 2.0 to 3.3 ) , and those with two or more previous injuries had a threefold greater risk of incident injury ( IRR = 3.0 ; 95 % CI 2.3 to 3.8 ) compared with athletes with no previous injuries . Conclusions : Injury history was associated with an increased injury rate . This suggests that , even in these youth soccer players , those with an injury history may be at higher risk
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 .