{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T13:37:27Z","timestamp":1790257047524,"version":"4.1.0"},"reference-count":52,"publisher":"Wiley","issue":"15","license":[{"start":{"date-parts":[[2013,7,8]],"date-time":"2013-07-08T00:00:00Z","timestamp":1373241600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2013,8]]},"abstract":"<jats:title>Key points<\/jats:title><jats:p><jats:list list-type=\"explicit-label\">\n<jats:list-item><jats:p>A primary feature of skeletal muscle lacking the protein dystrophin, as occurring in Duchenne muscular dystrophy, is a hypersensitivity to eccentric contraction\u2010induced injury. Dystrophin is associated with the plasmalemma which in healthy muscle has the physiological function of maintaining resting membrane potential to facilitate action potential generation and conduction during muscle activation.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>We tested the hypothesis that the physiological function of the plasmalemma is impaired as a result of eccentric contractions in dystrophic skeletal muscles.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Electromyographic analysis of dystrophic muscle from <jats:italic>mdx<\/jats:italic> mice, the murine model of Duchenne muscular dystrophy, during and immediately after eccentric contractions revealed impairment in the muscle's ability to generate and conduct action potentials.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>In agreement with our electromyographic analysis, assessment of resting membrane potentials showed that dystrophic muscle cells are depolarized immediately after an injurious bout of eccentric contractions.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Our results suggest a major plasmalemma\u2010based mechanism of strength loss underlying eccentric contraction\u2010induced injury in dystrophic muscle.<\/jats:p><\/jats:list-item>\n<\/jats:list><\/jats:p><jats:p><jats:bold>Abstract\u2002<\/jats:bold> A primary feature of skeletal muscle lacking the protein dystrophin, as occurring in Duchenne muscular dystrophy, is a hypersensitivity to contraction\u2010induced strength loss. We tested the hypothesis that the extensive strength loss results from an impairment in the electrophysiological function of the plasmalemma specifically impaired action potential development. Anterior crural muscles from <jats:italic>mdx<\/jats:italic> and wildtype mice performed a single bout of 100 electrically stimulated eccentric contractions <jats:italic>in vivo<\/jats:italic>. Electromyography, specifically the M\u2010wave, was analysed during muscle contraction to assess the ability of the tibialis anterior muscle plasmalemma to generate and conduct action potentials. During eccentric contractions, wildtype mice exhibited a 36% loss in torque about the ankle but <jats:italic>mdx<\/jats:italic> mice exhibited a greater torque loss of 73% (<jats:italic>P<\/jats:italic> &lt; 0.001). Despite the loss of torque, there was no reduction in M\u2010wave root mean square (RMS) for wildtype mice, which was in stark contrast to <jats:italic>mdx<\/jats:italic> mice that had a 55% reduction in M\u2010wave RMS (<jats:italic>P<\/jats:italic> &lt; 0.001). This impairment resolved within 24 h and coincided with a significant improvement in strength and membrane integrity. Intracellular measurements of resting membrane potential (RMP) in uninjured and injured extensor digitorum longus muscles were made to determine if a chronic depolarization had occurred, which could lead to impaired fibre excitability and\/or altered action potential conduction properties. The distributions of RMP were not different between wildtype uninjured and injured muscle cells (median: \u221273.2 mV <jats:italic>vs<\/jats:italic>. \u221272.7 mV, <jats:italic>P<\/jats:italic>= 0.46) whereas there was a significant difference between <jats:italic>mdx<\/jats:italic> uninjured and injured cells (median: \u221271.5 mV <jats:italic>vs<\/jats:italic>. \u221256.6 mV, <jats:italic>P<\/jats:italic> &lt; 0.001). These data show that <jats:italic>mdx<\/jats:italic> muscle fibres are depolarized after an injurious bout of eccentric contractions. These findings (i) suggest a major plasmalemma\u2010based mechanism of strength loss underlying contraction\u2010induced injury in Duchenne muscular dystrophy distinctly different from that for healthy muscle, and (ii) demonstrate dystrophin is critical for maintaining action potential generation and conduction after eccentric contractions.<\/jats:p>","DOI":"10.1113\/jphysiol.2013.254656","type":"journal-article","created":{"date-parts":[[2013,6,11]],"date-time":"2013-06-11T04:14:23Z","timestamp":1370924063000},"page":"3765-3776","source":"Crossref","is-referenced-by-count":50,"title":["Acute failure of action potential conduction in <i>mdx<\/i> muscle reveals new mechanism of contraction\u2010induced force loss"],"prefix":"10.1113","volume":"591","author":[{"given":"Jarrod A.","family":"Call","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gordon L.","family":"Warren","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mayank","family":"Verma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dawn A.","family":"Lowe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,7,8]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10974-006-9083-4"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.2005.091694"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1995.sp020943"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/mus.21327"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1186\/2044-5040-1-32"},{"key":"e_1_2_6_7_1","volume-title":"Muscles Alive: Their Functions Revealed by Electromyography","author":"Basmajian JV","year":"1985"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1152\/japplphysiol.00803.2009"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1005364713451"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF01837404"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajpcell.1997.273.2.C598"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1152\/japplphysiol.00942.2011"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/mus.21764"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1155\/2010\/981945"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1007\/s004240100561"},{"key":"e_1_2_6_16_1","doi-asserted-by":"publisher","DOI":"10.1097\/00002060-199202000-00002"},{"key":"e_1_2_6_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bbadis.2006.05.010"},{"key":"e_1_2_6_18_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.2003.054213"},{"key":"e_1_2_6_19_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.0021-8782.2001.00008.x"},{"key":"e_1_2_6_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/mus.20455"},{"key":"e_1_2_6_21_1","doi-asserted-by":"publisher","DOI":"10.1186\/2044-5040-1-10"},{"key":"e_1_2_6_22_1","doi-asserted-by":"publisher","DOI":"10.1186\/2044-5040-1-35"},{"key":"e_1_2_6_23_1","doi-asserted-by":"publisher","DOI":"10.1085\/jgp.200810024"},{"key":"e_1_2_6_24_1","doi-asserted-by":"publisher","DOI":"10.1002\/mus.880130105"},{"key":"e_1_2_6_25_1","doi-asserted-by":"publisher","DOI":"10.1152\/jn.2000.83.4.2002"},{"key":"e_1_2_6_26_1","doi-asserted-by":"publisher","DOI":"10.1152\/jappl.1998.85.1.58"},{"key":"e_1_2_6_27_1","doi-asserted-by":"publisher","DOI":"10.1042\/cs0630161"},{"key":"e_1_2_6_28_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1939.sp003756"},{"key":"e_1_2_6_29_1","doi-asserted-by":"publisher","DOI":"10.1126\/scisignal.2002829"},{"key":"e_1_2_6_30_1","doi-asserted-by":"publisher","DOI":"10.1152\/jappl.1991.70.6.2498"},{"key":"e_1_2_6_31_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajpcell.1997.272.1.C333"},{"key":"e_1_2_6_32_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajpcell.2000.279.4.C1290"},{"key":"e_1_2_6_33_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0047-6374(00)00111-1"},{"key":"e_1_2_6_34_1","doi-asserted-by":"publisher","DOI":"10.1152\/jappl.2000.88.1.91"},{"key":"e_1_2_6_35_1","doi-asserted-by":"publisher","DOI":"10.1152\/jappl.1986.61.1.293"},{"key":"e_1_2_6_36_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jns.2011.01.015"},{"key":"e_1_2_6_37_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00121296"},{"key":"e_1_2_6_38_1","doi-asserted-by":"publisher","DOI":"10.1002\/mus.880130813"},{"key":"e_1_2_6_39_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajpcell.00017.2008"},{"key":"e_1_2_6_40_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.90.8.3710"},{"key":"e_1_2_6_41_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.2012.241679"},{"key":"e_1_2_6_42_1","doi-asserted-by":"publisher","DOI":"10.1139\/y92-172"},{"key":"e_1_2_6_43_1","doi-asserted-by":"publisher","DOI":"10.1038\/335735a0"},{"key":"e_1_2_6_44_1","doi-asserted-by":"publisher","DOI":"10.1097\/00005768-200004000-00015"},{"key":"e_1_2_6_45_1","doi-asserted-by":"publisher","DOI":"10.1152\/jappl.1998.84.6.2171"},{"key":"e_1_2_6_46_1","doi-asserted-by":"publisher","DOI":"10.1097\/00003677-200104000-00008"},{"key":"e_1_2_6_47_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-7793.1999.609ac.x"},{"key":"e_1_2_6_48_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1993.sp019783"},{"key":"e_1_2_6_49_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.nmd.2006.07.024"},{"key":"e_1_2_6_50_1","doi-asserted-by":"publisher","DOI":"10.1002\/mus.21527"},{"key":"e_1_2_6_51_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.2004.061291"},{"key":"e_1_2_6_52_1","first-page":"287","article-title":"Linear and non\u2010linear EMG\/force relationships in human muscles. An anatomical\/functional argument for the existence of both","volume":"62","author":"Woods JJ","year":"1983","journal-title":"Am J Phys Med"},{"key":"e_1_2_6_53_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.2004.075275"}],"container-title":["The Journal of Physiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1113%2Fjphysiol.2013.254656","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/physoc.onlinelibrary.wiley.com\/doi\/pdf\/10.1113\/jphysiol.2013.254656","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,28]],"date-time":"2023-10-28T21:50:44Z","timestamp":1698529844000},"score":1,"resource":{"primary":{"URL":"https:\/\/physoc.onlinelibrary.wiley.com\/doi\/10.1113\/jphysiol.2013.254656"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2013,7,8]]},"references-count":52,"journal-issue":{"issue":"15","published-print":{"date-parts":[[2013,8]]}},"alternative-id":["10.1113\/jphysiol.2013.254656"],"URL":"https:\/\/doi.org\/10.1113\/jphysiol.2013.254656","archive":["Portico"],"relation":{},"ISSN":["0022-3751","1469-7793"],"issn-type":[{"value":"0022-3751","type":"print"},{"value":"1469-7793","type":"electronic"}],"subject":[],"published":{"date-parts":[[2013,7,8]]}}}