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 .
Lumbar load in adolescent fast bowlers: A prospective injury study.
OBJECTIVES This study aim ed to identify modifiable mechanisms associated with low back injury in adolescent cricket fast bowlers . DESIGN A prospect i ve study design examined the association between intrinsic risk factors , workload , bowling kinematics , lumbar load and low back injury incidence . METHODS Twenty-five injury free fast bowlers , aged 14 - 19 years , were assessed prior to the start of a  cricket season and observed during the season for low back injuries . RESULTS The twelve bowlers who suffered a low back injury displayed ; decreased hip flexion at front foot contact ( 46±6 ° vs 51±6 ° ) , increased pelvis rotation ( 287±11 ° vs 277±11 ° ) increased thorax lateral flexion ( 50±6 ° vs 40±8 ° ) at ball release , and larger peak lumbar flexion ( 10.5±4.9Nmkg(-1)m(-1 ) vs 6.9±2.5Nmkg(-1)m(-1 ) ) and lateral flexion moments ( 12.5±2.6Nmkg(-1)m(-1 ) vs 10.6±1.9Nmkg(-1)m(-1 ) ) . They also exhibited reduced muscular endurance of the back extensors ( 103±33s vs 132±33s ) and increased knee valgus angle during a single leg decline squat on the dominant ( 9±3 ° vs 5±4 ° ) and non-dominant leg ( 9±4 ° vs 6±3 ° ) in comparison to uninjured bowlers . CONCLUSIONS Bowlers who experience greater lumbar loads during bowling , have reduced back extensor muscle endurance , and demonstrate impaired control of the lumbo-pelvic-hip complex , are at increased risk of low back injury . This combination of strength , control and biomechanical factors may be key mechanical elements of low back injury causation in adolescent fast bowlers
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 .