Stroke Prevents Exercise-induced Gains in Bone Microstructure But Not Composition in Mice.

dc.contributor.author

Hanne, Nicholas J

dc.contributor.author

Steward, Andrew J

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Sessions, Marci R

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Thornburg, Hannah L

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Sheng, Huaxin

dc.contributor.author

Cole, Jacqueline H

dc.date.accessioned

2021-06-01T13:44:51Z

dc.date.available

2021-06-01T13:44:51Z

dc.date.issued

2019-10

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2021-06-01T13:44:50Z

dc.description.abstract

Ischemic stroke induces rapid loss in bone mineral density up to 13 times greater than during normal aging, leading to markedly increased risk of fracture. Little is known about skeletal changes following stroke beyond density loss. In this study we use a mild-moderate middle cerebral artery occlusion model to determine the effects of ischemic stroke without bedrest on bone microstructure, dynamic bone formation, and tissue composition. Twenty-seven 12-week-old male C57Bl/6J mice received either a stroke or sham surgery and then either received daily treadmill exercise or remained sedentary for four weeks. All mice were ambulatory immediately following stroke, and limb coordination during treadmill exercise was unaffected by stroke, indicating similar mechanical loading across limbs for surgery groups. Stroke did not directly detriment microstructure, but exercise only stimulated adaptation in sham group, not stroke group, with increased bone volume fraction and trabecular thickness in the sham distal femoral metaphysis. Stroke differentially decreased cortical area in the affected limb relative to the unaffected limb of the distal femoral metaphysis, and endosteal bone formation rate in the affected tibial diaphysis. Although exercise failed to improve bone microstructure following stroke, exercise increased mineral-to-matrix content in stroke but not sham. Together, these results show that stroke inhibits exercise-induced changes to femoral microstructure but not tibial composition, even without changes to gait. Similarly, affected-unaffected limb differences in cortical bone structure and bone formation rate in ambulatory mice show that stroke affects bone health even without bedrest.

dc.identifier

1065456

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0148-0731

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1528-8951

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https://hdl.handle.net/10161/23243

dc.language

eng

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ASME International

dc.relation.ispartof

Journal of biomechanical engineering

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10.1115/1.4045113

dc.title

Stroke Prevents Exercise-induced Gains in Bone Microstructure But Not Composition in Mice.

dc.type

Journal article

duke.contributor.orcid

Sheng, Huaxin|0000-0002-4325-2940

pubs.issue

12

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School of Medicine

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Anesthesiology

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Duke

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Clinical Science Departments

pubs.publication-status

Published

pubs.volume

141

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