Intersession reliability of the interpolated twitch technique applied during isometric,concentric, and eccentric actions of the human knee extensor muscles |
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| Authors: | Martin Behrens PhD Florian Husmann MSc Martin Gube MSc Sabine Felser PhD Matthias Weippert PhD Sven Bruhn PhD Volker Zschorlich PhD Anett Mau‐Moeller PhD |
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| Affiliation: | 1. Institute of Sport Science, University of Rostock, Rostock, Germany;2. Department of Orthopaedics, University Medicine Rostock, Rostock, Germany |
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| Abstract: | Introduction: Although it has been shown that voluntary activation (%VA) of the knee extensors during isometric contractions can be reliably assessed with the interpolated twitch technique, little is known about the reliability of %VA during concentric and eccentric muscle actions. Therefore, relative and absolute intersession reliability of quadriceps muscle's %VA during different contraction modes was determined. Methods: After a familiarization session, 21 participants (17 males, 25 ± 2 yrs) completed two testing sessions. Paired supramaximal electrical stimuli were administered to the femoral nerve during isometric, concentric, eccentric MVCs, and at rest to assess %VA (stimuli were applied at 70° knee flexion). Results and discussion: Data indicate that %VA of the knee extensors can be reliably measured during isometric [intraclass correlation coefficient (ICC) = 0.89, coefficient of variation (CV) = 4.1%], concentric (ICC = 0.87, CV = 6.6%), and eccentric muscle actions (ICC = 0.86, CV = 7.0%). Muscle Nerve 56 : 324–327, 2017 |
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| Keywords: | voluntary activation electrical stimulation paired electrical stimuli quadriceps femoris muscle femoral nerve twitch |
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