{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T13:37:03Z","timestamp":1790257023969,"version":"4.1.0"},"reference-count":66,"publisher":"American Physiological Society","issue":"2","funder":[{"DOI":"10.13039\/100000002","name":"HHS | National Institutes of Health (NIH)","doi-asserted-by":"publisher","award":["RO1 AR042423"],"award-info":[{"award-number":["RO1 AR042423"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"HHS | National Institutes of Health (NIH)","doi-asserted-by":"publisher","award":["RO1 AR049899"],"award-info":[{"award-number":["RO1 AR049899"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"HHS | National Institutes of Health (NIH)","doi-asserted-by":"publisher","award":["T32-GM008244"],"award-info":[{"award-number":["T32-GM008244"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"HHS | National Institutes of Health (NIH)","doi-asserted-by":"publisher","award":["T32-AG029796"],"award-info":[{"award-number":["T32-AG029796"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Applied Physiology"],"published-print":{"date-parts":[[2019,2,1]]},"abstract":"<jats:p> Mutation to the dystrophin gene causes skeletal muscle weakness in patients with Duchenne muscular dystrophy (DMD) or Becker muscular dystrophy (BMD). Deliberation continues regarding implications of prescribing exercise for these patients. The purpose of this study was to determine whether isometric resistance exercise (~10 tetanic contractions\/session) improves skeletal muscle strength and histopathology in the mdx mouse model of DMD. Three isometric training sessions increased in vivo isometric torque (22%) and contractility rates (54%) of anterior crural muscles of mdx mice. Mice expressing a BMD-causing missense mutated dystrophin on the mdx background showed comparable increases in torque (22%), while wild-type mice showed less change (11%). Increases in muscle function occurred within 1 h and peaked 3 days posttraining; however, the adaptation was lost after 7 days unless retrained. Six isometric training sessions over 4 wk caused increased isometric torque (28%) and contractility rates (22\u201328%), reduced fibrosis, as well as greater uniformity of fiber cross-sectional areas, fewer embryonic myosin heavy-chain-positive fibers, and more satellite cells in tibialis anterior muscle compared with the contralateral untrained muscle. Ex vivo functional analysis of isolated extensor digitorum longus (EDL) muscle from the trained hindlimb revealed greater absolute isometric force, lower passive stiffness, and a lower susceptibility to eccentric contraction-induced force loss compared with untrained EDL muscle. Overall, these data support the concept that exercise training in the form of isometric tetanic contractions can improve contractile function of dystrophin-deficient muscle, indicating a potential role for enhancing muscle strength in patients with DMD and BMD. <\/jats:p><jats:p> NEW &amp; NOTEWORTHY We focused on adaptive responses of dystrophin-deficient mouse skeletal muscle to isometric contraction training and report that in the absence of dystrophin (or in the presence of a mutated dystrophin), strength and muscle histopathology are improved. Results suggest that the strength gains are associated with fiber hypertrophy, reduced fibrosis, increased number of satellite cells, and blunted eccentric contraction-induced force loss in vitro. Importantly, there was no indication that the isometric exercise training was deleterious to dystrophin-deficient muscle. <\/jats:p>","DOI":"10.1152\/japplphysiol.00948.2018","type":"journal-article","created":{"date-parts":[[2018,12,20]],"date-time":"2018-12-20T12:55:21Z","timestamp":1545310521000},"page":"363-375","source":"Crossref","is-referenced-by-count":37,"title":["Isometric resistance training increases strength and alters histopathology of dystrophin-deficient mouse skeletal muscle"],"prefix":"10.1152","volume":"126","author":[{"given":"Angus","family":"Lindsay","sequence":"first","affiliation":[{"name":"Division of Rehabilitation Science and Division of Physical Therapy, Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, Minnesota"},{"name":"Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexie 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