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Impaired Hyperemic Response to Exercise Post Stroke. PLoS One 2015;10(12):e0144023

Date

12/03/2015

Pubmed ID

26630380

Pubmed Central ID

PMC4667998

DOI

10.1371/journal.pone.0144023

Abstract

Individuals with chronic stroke have reduced perfusion of the paretic lower limb at rest; however, the hyperemic response to graded muscle contractions in this patient population has not been examined. This study quantified blood flow to the paretic and non-paretic lower limbs of subjects with chronic stroke after submaximal contractions of the knee extensor muscles and correlated those measures with limb function and activity. Ten subjects with chronic stroke and ten controls had blood flow through the superficial femoral artery quantified with ultrasonography before and immediately after 10 second contractions of the knee extensor muscles at 20, 40, 60, and 80% of the maximal voluntary contraction (MVC) of the test limb. Blood flow to the paretic and non-paretic limb of stroke subjects was significantly reduced at all load levels compared to control subjects even after normalization to lean muscle mass. Of variables measured, increased blood flow after an 80% MVC was the single best predictor of paretic limb strength, the symmetry of strength between the paretic and non-paretic limbs, coordination of the paretic limb, and physical activity. The impaired hemodynamic response to high intensity contractions was a better predictor of lower limb function than resting perfusion measures. Stroke-dependent weakness and atrophy of the paretic limb do not explain the reduced hyperemic response to muscle contraction alone as the response is similarly reduced in the non-paretic limb when compared to controls. These data may suggest a role for perfusion therapies to optimize rehabilitation post stroke.

Author List

Durand MJ, Murphy SA, Schaefer KK, Hunter SK, Schmit BD, Gutterman DD, Hyngstrom AS

Authors

Matt Durand PhD Associate Professor in the Physical Medicine and Rehabilitation department at Medical College of Wisconsin
David D. Gutterman MD Sr Associate Director, Professor in the Medicine department at Medical College of Wisconsin
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

Aged
Exercise
Female
Humans
Hyperemia
Male
Middle Aged
Stroke