Volume 56, Issue 6 pp. E85-E94
Basic Science Research

Non-invasive assessment of muscle injury in healthy and dystrophic animals with electrical impedance myography

Benjamin Sanchez PhD

Benjamin Sanchez PhD

Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA

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Shama R. Iyer PhD

Shama R. Iyer PhD

Department of Orthopaedics, University of Maryland School of Medicine, AHB, Room 540, 100 Penn Street, Baltimore, Maryland, 21201 USA

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Jia Li PhD

Jia Li PhD

Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA

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Kush Kapur PhD

Kush Kapur PhD

Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA

Boston Children's Hospital, Boston, Massachusetts, USA

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Su Xu PhD

Su Xu PhD

Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA

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Seward B. Rutkove MD

Seward B. Rutkove MD

Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA

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Richard M. Lovering PhD, PT

Corresponding Author

Richard M. Lovering PhD, PT

Department of Orthopaedics, University of Maryland School of Medicine, AHB, Room 540, 100 Penn Street, Baltimore, Maryland, 21201 USA

Correspondence to: R.M. Lovering; e-mail: [email protected]Search for more papers by this author
First published: 05 January 2017
Citations: 23

Disclosures: B.S. is named as an inventor on a patent application in the field of electrical impedance. He receives consulting income from Maxim Integrated, Inc., a company that designs impedance circuits S.R. has equity in and serves a consultant and scientific advisor to Skulpt, Inc., a company that designs impedance devices for clinical and research use. He is also a member of the company's board of directors. The company also has an option to license patented impedance technology of which S.R. is named as an inventor. This study, however, did not employ any relevant company or patented technology.

This study was supported by grants from the National Institutes of Health (training grant T32 AR-007592 to S.R.I., and research grants R01-AR059179 and R21-AR067872-01 to R.M.L. and R01NS055099 to S.R.).

ABSTRACT

Introduction

Dystrophic muscle is particularly susceptible to eccentric contraction–induced injury. We tested the hypothesis that electrical impedance myography (EIM) can detect injury induced by maximal-force lengthening contractions.

Methods

We induced injury in the quadriceps of wild-type (WT) and dystrophic (mdx) mice with eccentric contractions using an established model.

Results

mdx quadriceps had significantly greater losses in peak twitch and tetany compared with losses in WT quadriceps. Injured muscle showed a significant increase in EIM characteristic frequency in both WT (177 ± 7.7%) and mdx (167 ± 7.8%) quadriceps. EIM also revealed decreased extracellular resistance for both WT and mdx quadriceps after injury.

Discussion

Our results show overall agreement between muscle function and EIM measurements of injured muscle, indicating that EIM is a viable tool to assess injury in dystrophic muscle. Muscle Nerve 56: E85–E94, 2017

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.

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