INTRODUCTION: Stroke-related changes in maximal dynamic hip flexor muscle fatigability may be more relevant functionally than isometric hip flexor fatigability. METHODS: Ten chronic stroke survivors performed 5 sets of 30 hip flexion maximal dynamic voluntary contractions (MDVC). A maximal isometric voluntary contraction (MIVC) was performed before and after completion of the dynamic contractions. Both the paretic and nonparetic legs were tested. RESULTS: Reduction in hip flexion MDVC torque in the paretic leg (44.7%) was larger than the nonparetic leg (31.7%). The paretic leg had a larger reduction in rectus femoris EMG (28.9%) between the first and last set of MDVCs than the nonparetic leg (7.4%). Reduction in paretic leg MDVC torque was correlated with self-selected walking speed (r2=0.43), while reduction in MIVC torque was not (r2=0.11). CONCLUSIONS: Reductions in maximal dynamic torque of paretic hip flexors may be a better predictor of walking function than reductions in maximal isometric contractions.
INTRODUCTION:Stroke-related changes in maximal dynamic hip flexor muscle fatigability may be more relevant functionally than isometric hip flexor fatigability. METHODS: Ten chronic stroke survivors performed 5 sets of 30 hip flexion maximal dynamic voluntary contractions (MDVC). A maximal isometric voluntary contraction (MIVC) was performed before and after completion of the dynamic contractions. Both the paretic and nonparetic legs were tested. RESULTS: Reduction in hip flexion MDVC torque in the paretic leg (44.7%) was larger than the nonparetic leg (31.7%). The paretic leg had a larger reduction in rectus femoris EMG (28.9%) between the first and last set of MDVCs than the nonparetic leg (7.4%). Reduction in paretic leg MDVC torque was correlated with self-selected walking speed (r2=0.43), while reduction in MIVC torque was not (r2=0.11). CONCLUSIONS: Reductions in maximal dynamic torque of paretic hip flexors may be a better predictor of walking function than reductions in maximal isometric contractions.
Authors: Allison S Hyngstrom; Tanya Onushko; Robert P Heitz; Anthony Rutkowski; Sandra K Hunter; Brian D Schmit Journal: Am J Phys Med Rehabil Date: 2012-01 Impact factor: 2.159
Authors: Spencer A Murphy; Francesco Negro; Dario Farina; Tanya Onushko; Matthew Durand; Sandra K Hunter; Brian D Schmit; Allison Hyngstrom Journal: J Neurophysiol Date: 2018-10-31 Impact factor: 2.974
Authors: Francesco Negro; Kathleen E Bathon; Jennifer N Nguyen; Cassidy G Bannon; Claudio Orizio; Sandra K Hunter; Allison S Hyngstrom Journal: Front Neurol Date: 2020-10-29 Impact factor: 4.003