The effects of concentric and eccentric training in murine models of dysferlin‐associated muscular dystrophy
Introduction Dysferlin‐deficient murine muscle sustains severe damage after repeated eccentric contractions. Methods With a robotic dynamometer, we studied the response of dysferlin‐sufficient and dysferlin‐deficient mice to 12 weeks of concentrically or eccentrically biased contractions. We also st...
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Published in | Muscle & nerve Vol. 62; no. 3; pp. 393 - 403 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Hoboken, USA
John Wiley & Sons, Inc
01.09.2020
Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Introduction
Dysferlin‐deficient murine muscle sustains severe damage after repeated eccentric contractions.
Methods
With a robotic dynamometer, we studied the response of dysferlin‐sufficient and dysferlin‐deficient mice to 12 weeks of concentrically or eccentrically biased contractions. We also studied whether concentric contractions before or after eccentric contractions reduced muscle damage in dysferlin‐deficient mice.
Results
After 12 weeks of concentric training, there was no net gain in contractile force in dysferlin‐sufficient or dysferlin‐deficient mice, whereas eccentric training produced a net gain in force in both mouse strains. However, eccentric training induced more muscle damage in dysferlin‐deficient vs dysferlin‐sufficient mice. Although concentric training produced minimal muscle damage in dysferlin‐deficient mice, it still led to a prominent increase in centrally nucleated fibers. Previous exposure to concentric contractions conferred slight protection on dysferlin‐deficient muscle against damage from subsequent injurious eccentric contractions.
Discussion
Concentric contractions may help dysferlin‐deficient muscle derive the benefits of exercise without inducing damage. |
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Bibliography: | Funding information Joshua J. Hass, Chantel A. Basel, Jacob M. Blackmer, Jasmine T. Konja, and Amber L. Samojedny contributed equally to this study. Morium Begam and Renuka Roche are co–first authors. Alliance for Regenerative Rehabilitation Research and Training (AR3T), Grant/Award Number: Subaward Under NIH P2CHD086843; Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Grant/Award Number: FRAP Award; National Center for Medical Rehabilitation Research, Grant/Award Number: R03HD091648; Wayne State University, Grant/Award Number: Startup Package; Jain Foundation, Inc., Grant/Award Number: Banner 25RCU ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0148-639X 1097-4598 |
DOI: | 10.1002/mus.26906 |