Estimation of 1 repetition maximum of the non-paretic knee extension strength of hemiplegic stroke patients

Abstract

[Purpose] The purpose of this study was to determine the regression equation for estimating 1 repetition maximum (1RM) of knee extension on the non-paretic side in hemiplegia. [Subjects and Methods] The knee extension strengths on the non-paretic side of 37 patients with hemiplegia after stroke were measured using a hand-held dynamometer (HHD). The associations between 1RM and maximal muscle strength, age, gender, body mass index, time since the onset of stroke, the Brunnstrom recovery stage of the lower extremities, functional independence measure of gait function, and associative reaction in hemiplegia were assessed using multivariate analysis. [Results] The analysis provided the following regression equations: 1RM=0.157 × knee extension strength + 2.183 (R2=0.549), and 1RM=0.385 × peak torque of knee extension + 2.795 (R2=0.583). [Conclusion] The 1RM of knee extension on the non-paretic side of hemiplegic stroke patients can be estimated from the knee extension strength measured by a HHD.