Marit L Mulder1, Elke Van den Steen2, Jan De Neve2, Adam Weir1,3,4. 1. Department of Orthopaedics and Sports Medicine, Erasmus MC University Medical Centre for Groin Injuries, Rotterdam, The Netherlands. 2. AZ Sint-Jan hospital, Bruges, Belgium. 3. Sports Groin Pain Centre, Aspetar Orthopaedic and Sports Medicine Hospital, Doha, Qatar. 4. Sports Medicine and Exercise Clinic Haarlem (SBK), Haarlem, The Netherlands.
Abstract
BACKGROUND: Core strength is an important aspect of physical fitness. A dynamometer was developed to measure isokinetic core muscle strength in multiple planes of motion. Establishing the reliability is needed before it can be used in practice. OBJECTIVE: Examine the intra-observer reliability of a trunk isokinetic dynamometer. METHODS: 31 participants were recruited. Tests were performed twice with an interval of 5-9 days by the same observer. Testing included rotation, flexion/extension and lateral flexion at speeds of 90∘/s and 60∘/s. The main outcome measure was peak torque (PT). The secondary outcomes included peak torque angle (PTA), time to peak torque (TTPT) and compensatory torques (CompTQ). The intra-observer reliability was investigated using intraclass correlation coefficients (ICC). RESULTS: Peak torque reliability was good to excellent (ICC = 0.70-0.91), whereas the reliability of the PTA (ICC =-0.04-0.56) and TTPT (ICC = 0.01-0.68) were poor to moderate. CompTQ reliability was moderate to good (ICC = 0.20-0.88). CONCLUSIONS: The intra-observer reliability of the isokinetic measurement of core strength peak torque was good. The secondary outcomes peak torque angle and time to peak torque were less reliable and the compensatory torques showed moderate to good reliability. This isokinetic dynamometer could have useful applications in the field of sports medicine and rehabilitation.
BACKGROUND: Core strength is an important aspect of physical fitness. A dynamometer was developed to measure isokinetic core muscle strength in multiple planes of motion. Establishing the reliability is needed before it can be used in practice. OBJECTIVE: Examine the intra-observer reliability of a trunk isokinetic dynamometer. METHODS: 31 participants were recruited. Tests were performed twice with an interval of 5-9 days by the same observer. Testing included rotation, flexion/extension and lateral flexion at speeds of 90∘/s and 60∘/s. The main outcome measure was peak torque (PT). The secondary outcomes included peak torque angle (PTA), time to peak torque (TTPT) and compensatory torques (CompTQ). The intra-observer reliability was investigated using intraclass correlation coefficients (ICC). RESULTS: Peak torque reliability was good to excellent (ICC = 0.70-0.91), whereas the reliability of the PTA (ICC =-0.04-0.56) and TTPT (ICC = 0.01-0.68) were poor to moderate. CompTQ reliability was moderate to good (ICC = 0.20-0.88). CONCLUSIONS: The intra-observer reliability of the isokinetic measurement of core strength peak torque was good. The secondary outcomes peak torque angle and time to peak torque were less reliable and the compensatory torques showed moderate to good reliability. This isokinetic dynamometer could have useful applications in the field of sports medicine and rehabilitation.
Entities:
Keywords:
Core strength; dynamometer; isokinetic; peak torque; sports medicine
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