Search

Introduction: Reliable and valid measurements for shoulder muscular endurance should be available for clinical use. The posterior shoulder endurance test offers a potential clinical assessment, but its construct validity isn't available. Since a criterion measure of muscular endurance is not available, this study's purpose was to determine a reliable method for testing shoulder muscular endurance using an isokinetic dynamometer., Methods: The test-retest reliability, standard error measurement, and minimal detectable change were calculated on four different paradigms to quantify muscular fatigue using two isokinetic speeds (60°sec -1 ,180°sec -1 ). Calculation paradigms included peak torque fatigue index (FI), average torque FI, area-under-the-curve FI, and peak torque decay slope. Testing occurred on two days. Repeated measures analysis of variance compared the two peak torque decay slopes across both testing days., Results: Superior reliability was found within the decay slope measurements at both 60°sec -1 (ICC = 0.941) and 180°sec -1 (ICC = 0.764) speeds, with the 60°sec -1 decay slope being the highest reliability between the two angular velocities. There was a greater amount of fatigue in the 60°sec -1 decay slope compared to the 180°sec -1 decay slope., Conclusion: Using the decay slope of isokinetic shoulder horizontal abduction at 60°sec -1 is a reliable method to validate other muscular endurance clinical measures. Rehabilitation specialists should utilize the decay slope of the isokinetic dynamometry to monitor responsiveness., Competing Interests: Declaration of competing interest The authors have no personal interest or disclosures to make regarding this manuscript., (Copyright © 2023 Elsevier Ltd. All rights reserved.)

Objective: This investigation measured the reproducibility and discriminant validity of the Posterior Shoulder Endurance Test (PSET) on painful and non-painful populations., Design: Reliability and validity study., Setting: Laboratory setting., Participants: Thirty subjects (male = 11; female = 19)., Main Outcome Measures: Time to failure (TTF) was the primary outcome measure to determine reliability of the PSET. Discriminant validity identified with receiver operator characteristic (ROC) curves utilized TTF separately in men and women since they used different loads., Results: There were 25/30 subjects (painful = 12; non-painful = 13) tested a second time. ICC, SEM, and MDC90 ranged respectively from 0.77, 13.1 s, 30.6 s in the painful group to 0.85, 7.3 s, 17 s in the non-painful group. The male ROC curve AUC was 0.833 with 47 s resulting in the best combination of sensitivity = 0.833, and specificity = 0.80. The female ROC curve AUC was 0.633 with 46 s resulting in the best combination of sensitivity = 0.600 and specificity = 0.889 at 46 s., Conclusion: The PSET is a reliable way to measure shoulder girdle muscular endurance. These data suggest that the PSET discriminates painful and non-painful individuals better in men compared to women., (Copyright © 2020 Elsevier Ltd. All rights reserved.)