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Stroke-related effects on maximal dynamic hip flexor fatigability and functional implications. Muscle Nerve 2015 Mar;51(3):446-8

Date

11/18/2014

Pubmed ID

25399720

Pubmed Central ID

PMC4484723

DOI

10.1002/mus.24520

Abstract

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.

Author List

Kuhnen HR, Rybar MM, Onushko T, Doyel RE, Hunter SK, Schmit BD, Hyngstrom AS

Authors

Allison Hyngstrom PhD Associate Professor in the Physical Therapy department at Marquette University
Brian Schmit PhD Professor in the Biomedical Engineering department at Marquette University




MESH terms used to index this publication - Major topics in bold

Female
Hip Joint
Humans
Male
Middle Aged
Muscle Contraction
Muscle Fatigue
Stroke