Test-Retest Reliability of the Internal Shoulder Rotator Muscles' Stretch Reflex in Healthy Men

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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 sEMG. Reflex latencies showed a pre-activation effect (ƞ2 = 0,355). ICC ranged from 0,735 to 0,909 indicating an overall “good” relative reliability. SEM score bands lay between ±7,0 to ±12,3 ms around the obtained scores of the participants. 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. Some modifications need to be conducted for clinical application.
Original languageEnglish
JournalJournal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology
Publication statusSubmitted - 2020

ID: 5535392

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