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Stroke‐related effects on maximal dynamic hip flexor fatigability and functional implications
Author(s) -
Kuhnen Henry R.,
Rybar Megan M.,
Onushko Tanya,
Doyel Ryan E.,
Hunter Sandra K.,
Schmit Brian D.,
Hyngstrom Allison S.
Publication year - 2015
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.24520
Subject(s) - isometric exercise , medicine , physical medicine and rehabilitation , leg muscle , electromyography , stroke (engine) , physical therapy , physics , thermodynamics
: 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 ( r 2 = 0.43), while reduction in MIVC torque was not ( r 2 = 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. Muscle Nerve 51 : 446–448, 2015