Test-Retest Reliability and the Learning Effect on Isokinetic Fatigue in Female Master’s Cyclists

Jordan M. Glenn, Michelle Gray, Nicole E. Moyen, Jennifer L. Vincenzo, Kylie K. Harmon, Lee E. Brown


Background: Isokinetic exercise is commonly used as a benchmark for strength and performance. Objective: The purpose of this investigation was to establish isokinetic fatigue test-retest reliability and examine the learning effect when testing without familiarization. Methods: 22 masters-aged [53±5 years), competitive female cyclists completed 3 separate 50-repetition knee flexion/extension tests on a Biodex, separated by one-week with no familiarization. Test-retest reliability [intra-class correlation [ICC]), 95% confidence intervals [CI), technical error of measurement [TEM) were calculated. Results: ICCs between trials exhibited excellent reliability during extension [.93–.97) and flexion [.93–.97) for all variables except time to peak torque [ICC=.35 and.45 for extension and flexion, respectively) and fatigue index [ICC=.47 for flexion). Relative TEM was minimal for extension between trial 1 and trial 2 [0.27%–0.97%) and between trial 2 and trial 3 [0.27%–1.45%) for all variables. Similar results were observed for flexion between trial 1 and trial 2 [0.87%–2.45%) and between trial 2 and trial 3 [0.54%–1.10%). No differences [Wilks Λ>.05) existed between trials, indicating no learning effect associated with the tests. Conclusions: There was strong test-retest reliability in masters-aged, female athletes and no learning effect was associated with the Biodex during a knee extension/flexion fatigue protocol.


Muscle Fatigue, Muscle Strength Dynamometer, Athletic Performance, Women, Athletes

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DOI: https://doi.org/10.7575/aiac.ijkss.v.6n.4p.1


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