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- Title
Intra-Rater Reliability and Error of Measurement of Knee Isokinetic Eccentric Muscle Performance Assessment Procedures in Anterior Cruciate Ligament Injury Prevention Screening for Adult Agility-Sport Athletes.
- Authors
Llurda-Almuzara, Luis; Lewis, Courtney; Clark, Nicholas C.
- Abstract
Introduction: Noncontact anterior cruciate ligament (ACL) injuries occur frequently during change-of-direction/landing tasks when eccentric muscle performance is required to decelerate momentum and shock-absorb forces away from noncontractile tissues. Therefore, assessment of knee eccentric muscle performance is prudent in noncontact ACL injury prevention screening, but reliable measurement procedures are scarce in the literature. Objective: To assess critical psychometric properties of a new knee isokinetic eccentric muscle performance assessment procedure linked closely to noncontact ACL injury mechanisms and using a specific knee range-of-motion and velocity-of-motion (specificity of testing.1,2 It was hypothesised that procedures would demonstrate good intra-rater reliability (intraclass correlation coefficient [ICC] ≥0.75). Study design: Between-day (D1/D2) repeated measures. Setting: biomechanics laboratory. Study population: 12 agility-sport athletes volunteered (male n=7, female n=5, age 23.5±4.6yr; height 170.0±10.1cm; mass 75.7±12.3kg). Assessment: athletes were seated on an isokinetic dynamometer set to eccentric mode. For specificity of testing, dynamometer configuration was knee flexion/extension range-of-motion 0-60° and velocity-of-motion 240°/second. Five maximal-effort knee flexion (eccentric quadriceps) and extension (eccentric hamstrings) trials were performed. Peak torque (PT; Newton-metres [Nm]) and time-to-peak torque (TTPT; milliseconds [ms]) were measured. Limb order was randomised for D1, the order repeated for D2. Main outcome measurements: relative reliability (ICC 2,1), absolute reliability (standard error of measurement [SEM]). Results: For eccentric quadriceps PT ICC/SEM: right 0.76/22.8Nm, left 0.78/19.0Nm. For eccentric quadriceps TTPT ICC/SEM: right 0.07/213.0ms, left 0.13/316.3ms. For eccentric hamstrings PT ICC/SEM: right 0.92/13.7Nm, left 0.96/8.0Nm. For eccentric hamstrings TTPT ICC/SEM: right 0.74/12.5ms, left 0.41/16.6ms. Conclusion: For both eccentric quadriceps and hamstrings, PT consistently demonstrated good relative reliability (ICC>0.75) but TTPT did not (ICC<0.75). Interestingly, right and left eccentric hamstring TTPT absolute reliability (SEM) were <17.0ms. These new knee isokinetic eccentric PT assessment procedures possess critical psychometric properties that qualify them for use in ACL injury prevention screening systems with adult agility-sport athletes.
- Subjects
NORWAY; KNEE physiology; ANTERIOR cruciate ligament injury prevention; MOTOR ability; RESEARCH evaluation; MUSCLE strength testing; CONFERENCES &; conventions; ATHLETES; MEASUREMENT errors; PSYCHOMETRICS; MEDICAL screening; ATHLETIC ability; ISOKINETIC exercise; RANGE of motion of joints; ADULTS
- Publication
International Journal of Sports Physical Therapy, 2024, Vol 19, Issue 6, p775
- ISSN
2159-2896
- Publication type
Article