Future studies should also consider measures of ME and MS as a function of upper body , lower body , and core strength , and their potential association with specific , rather than general ,
Abstract de la Motte , SJ , Gribbin , TC , Lisman , P , Murphy , K , and Deuster , PA .
A systematic review of the association between physical fitness and musculoskeletal injury risk : part 2—muscular endurance and muscular strength .
Identifying risk factors for contact injury in professional rugby league players--application of a frailty model for recurrent injury.
OBJECTIVES Well-developed physical qualities may protect against contact injuries . However , the potential contribution of physical qualities as risk or protective factors to contact injury risk is yet to be determined for rugby league . This study applied a frailty survival model that accounts for recurrent injury to identify risk factors for all physiotherapist-reported contact injury in professional rugby league players . DESIGN Prospect i ve cohort study . METHODS Sixty-six professional rugby league players participated in this three successive year prospect i ve study . At the start of each season , all players underwent measurements of st and ard anthropometry  ( height , body mass , and sum of seven skinfolds )  , speed ( 10 m and 40 m sprint ) , muscular strength ( 1 repetition maximum [ RM ] bench press , 1RM squat , 1RM weighted chin-ups ) , power ( vertical jump , bench throw , 1RM power clean , jump squat ) , and endurance ( maximum repetition bench press with 60 kg resistance ) , repeated-sprint ability ( 12 × 20 m sprints performed on a 20s cycle ) , prolonged high-intensity intermittent running ability ( 8 × 12 s maximal effort shuttles performed on a 48 s cycle ) , and maximal aerobic power ( multi-stage fitness test ) . Data was used to demonstrate the application of the frailty model extension of the Cox proportional regression model for recurrent events to identify factors associated with a high hazard ratio ( HR ) of injury . RESULTS Heavier ( body mass , HR=2.6 , 95 % CI=1.2 - 5.7 ) , and faster ( 40 m sprint , HR=2.1 , 95 % CI=1.0 - 4.2 ) players , and those with poorly developed prolonged high-intensity intermittent running ability ( HR=2.9 , 95 % CI=1.7 - 5.0 ) and upper-body strength ( chin-up , HR=2.2 , 95 % CI=1.3 - 3.7 ) had a higher incidence of contact injuries . CONCLUSIONS This study demonstrates application of a novel statistical approach for the analysis of injury data that is recurrent in nature . This approach identified that the greater impact forces generated from heavier players with faster speed may result in an increase in recurrent contact injury rates . However , the development of prolonged high-intensity intermittent running ability and upper-body strength and power may assist to reduce the risk of contact injury in professional rugby league players
Future studies should also consider measures of ME and MS as a function of upper body , lower body , and core strength , and their potential association with specific , rather than general ,
Abstract de la Motte , SJ , Gribbin , TC , Lisman , P , Murphy , K , and Deuster , PA .
A systematic review of the association between physical fitness and musculoskeletal injury risk : part 2—muscular endurance and muscular strength .