Intersession reliability and magnitude of change of isokinetic testing of the glenohumeral rotators in overhead athletes with unilateral shoulder anterior instability
Abstract
To investigate the reliability and magnitude of change of isokinetic testing of the glenohumeral rotators in overhead athletes with unilateral anterior shoulder instability. Test-Retest Clinical Thirty patients (17 males, 27.9±10.8 years) with unilateral anterior shoulder instability. Maximal and average peak torques (PTa), and total work values were extracted from shoulder internal and external rotation in concentric and eccentric modes at 60°/s, and in concentric mode at 180°/s. PTa at 60°/s presented the highest reliability [Intraclass Coefficient of Correlation (ICC): 0.88 to 0.95] and lowest measurement error Minimal Detectable Change at 95% confidence interval (MDC 95% ): 23.2 to 35.4%], irrespective of the movement direction and contraction modalities. Conventional, functional and modal ratios based on these average values displayed poor-to-good reliability [ICC: 0.16 to 0.88] and high measurement error [MDC 95% : 22.6 to 43.2%]. Despite significant differences (p<0.001 for all), the magnitudes of changes over 6 months were lower than the MDC 95% values. Based on average peak torque values assessed at 60°/s, changes in maximal strength may be higher than 35% to be considered real changes during rehabilitation process, while muscular imbalance should be interpreted with caution • Mean peak torques at 60°/s show the highest reliability in unstable shoulders • Torques changes should exceed 35% to be considered real changes • Ratios display good reliability, but high measurement error in unstable shoulders • Muscular imbalance derived on isokinetic ratios should be interpreted cautiously
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BibTeX
@article{seurot2026intersession,
title = {{Intersession reliability and magnitude of change of isokinetic testing of the glenohumeral rotators in overhead athletes with unilateral shoulder anterior instability}},
author = {Antoine Seurot and Ann Cools and François Fourchet and Yoann Blache and Isabelle Rogowski},
journal = {Physical Therapy in Sport},
year = {2026},
month = sep,
doi = {10.1016/j.ptsp.2026.101892},
url = {https://hal.science/hal-05768006v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Intersession reliability and magnitude of change of isokinetic testing of the glenohumeral rotators in overhead athletes with unilateral shoulder anterior instability
AU - Antoine Seurot
AU - Ann Cools
AU - François Fourchet
AU - Yoann Blache
AU - Isabelle Rogowski
PY - 2026
DA - 2026/09/28
JO - Physical Therapy in Sport
DO - 10.1016/j.ptsp.2026.101892
UR - https://hal.science/hal-05768006v1
AB - To investigate the reliability and magnitude of change of isokinetic testing of the glenohumeral rotators in overhead athletes with unilateral anterior shoulder instability. Test-Retest Clinical Thirty patients (17 males, 27.9±10.8 years) with unilateral anterior shoulder instability. Maximal and average peak torques (PTa), and total work values were extracted from shoulder internal and external rotation in concentric and eccentric modes at 60°/s, and in concentric mode at 180°/s. PTa at 60°/s presented the highest reliability [Intraclass Coefficient of Correlation (ICC): 0.88 to 0.95] and lowest measurement error Minimal Detectable Change at 95% confidence interval (MDC 95% ): 23.2 to 35.4%], irrespective of the movement direction and contraction modalities. Conventional, functional and modal ratios based on these average values displayed poor-to-good reliability [ICC: 0.16 to 0.88] and high measurement error [MDC 95% : 22.6 to 43.2%]. Despite significant differences (p<0.001 for all), the magnitudes of changes over 6 months were lower than the MDC 95% values. Based on average peak torque values assessed at 60°/s, changes in maximal strength may be higher than 35% to be considered real changes during rehabilitation process, while muscular imbalance should be interpreted with caution • Mean peak torques at 60°/s show the highest reliability in unstable shoulders • Torques changes should exceed 35% to be considered real changes • Ratios display good reliability, but high measurement error in unstable shoulders • Muscular imbalance derived on isokinetic ratios should be interpreted cautiously
SN - 1466-853X
ER -