Abstract
The purpose of this study was to determine the test-retest reliability of isokinetic ankle dorsiflexor fatigue in older healthy adults using the Biodex dynamometer. Thirty older, healthy and recreationally active men and women (mean age 75.4 ± 4.3 years) performed 50 maximal concentric (60°/s) dorsiflexion contractions on two different occasions. Total work (TW), losses in work (work fatigue; WF), and relative losses in peak torque (the relative loss of peak torque from the first three repetitions to the last three repetitions in %; 3–3), were measured. Several statistical measures were used to assess reliability. The intra-class correlation coefficients (ICC 2,1), the within subjects coefficient of variation (CV), as well as the Bland-Altman plots and analyses, showed that test-retest reliability was good to excellent (ICC values: 0.61 to 0.90) and CVs were acceptable (12.8% to 13.8%) for men and women combined. No systematic bias was detected. These values indicate a slightly lower reliability compared with our previously reported test-retest reliability measurements on younger men and women (age range 21 to 32 years). In conclusion, ankle dorsiflexion fatigue can be reliably assessed on a Biodex dynamometer. Reliability of fatigue measurements is slightly lower for healthy older individuals compared with younger healthy subjects.
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