Test-retest reliability of the internal shoulder rotator muscles' stretch reflex in healthy men

  • Until now the reproducibility of the short latency stretch reflex of the internal rotator muscles of the glenohumeral joint has not been identified. Twenty-three healthy male participants performed three sets of external shoulder rotation stretches with various pre-activation levels on two different dates of measurement to assess test-retest reliability. All stretches were applied with a dynamometer acceleration of 104°/s2 and a velocity of 150°/s. Electromyographical response was measured via surface EMG. Reflex latencies showed a pre-activation effect (ƞ2 = 0,355). ICC ranged from 0,735 to 0,909 indicating an overall “good” relative reliability. SRD 95% lay between ±7,0 to ±12,3 ms.. The reflex gain showed overall poor test-retest reproducibility. The chosen methodological approach presented a suitable test protocol for shoulder muscles stretch reflex latency evaluation. A proof-of-concept study to validate the presented methodical approach in shoulder involvement including subjects with clinically relevant conditions is recommended.

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Author:Lars N. Heinke, Axel J. Knicker, Kirsten Albracht
Parent Title (English):Journal of Electromyography and Kinesiology
Document Type:Article
Year of Completion:2021
Date of the Publication (Server):2021/11/16
Tag:intraclass correlation coefficient; shoulder; standard error of measurement; stretch reflex; test-retest reliability
Issue:In Press, Article 102611
Institutes:FH Aachen / Fachbereich Medizintechnik und Technomathematik
FH Aachen / IfB - Institut für Bioengineering