Reliability of indices of neuromuscular leg performance in end-stage renal failure
Naish, P. F.
Wilcock, J. E.
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Gleeson, N., Naish, P., Wilcock, J. & Mercer, T. (2002) Reliability of indices of neuromuscular leg performance in end-stage renal failure, Journal of Rehabilitation Medicine, vol. 34, , pp. 273-277,
The purpose of this study was to examine the day-to-day reproducibility and single measurement reliability of peak force, time to half peak force and rate of force development indices of knee extension neuromuscular performance in patients with end-stage renal failure. Eleven self-selected patients (6 men, 5 women) receiving maintenance dialysis (dialysis history 67 42.8 month) completed 3 inter-day assessment sessions. Each comprised a standardized warm-up and 3 intermittent static maximal voluntary actions of the knee extensors of the preferred limb (45 knee flexion angle [0 = full knee extension]) using a specially-constructed dynamometer. Repeated measures ANOVA of coefficient of variation scores revealed significant differences between indices in their reproducibility across day-to-day trials. Post-hoc comparisons of group mean scores suggested that peak force (6.6 3.0%) offers significantly greater measurement reproducibility than time to half peak force (16.8 9.5%) or rate of force development (20.3 12.1%). Intraclass correlation coefficients and standard error of measurement scores showed that single-trial assessments of peak force, time to half peak force and rate of force development would demonstrate limited precision and capability to discriminate subtle intra-subject or inter-subject changes in neuromuscular performance.