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A comparative analysis of peripheral and respiratory muscles' atrophy and dysfunction in acute lung injury (ALI) has not been performed. We aimed to evaluate diaphragmatic and peripheral muscle mass and contractility in an ALI animal model. ALI was induced in C57BL\/6 mice by intratracheal lipopolysaccharides instillation. Muscle mass and in vitro contractility were evaluated at different time points in hindlimb soleus (slow\u2010twitch) and extensor digitorum longus (EDL, fast\u2010twitch), as well as in the main respiratory muscle diaphragm. Myogenic precursor satellite cell\u2010specific transcription factor Pax7 expression was determined by Western blot. Lung injury was associated with atrophy of the three studied muscles, although it was more pronounced and persistent in the diaphragm. Specific contractility was reduced during lung injury in EDL muscle but restored by the time lung injury has resolved. Specific force was not affected in soleus and diaphragm. A persistent increase in Pax7 expression was detected in diaphragm and EDL muscles after induction of ALI, but not in soleus muscle. Different peripheral and respiratory skeletal muscles are distinctly affected during the course of ALI. Each of the studied muscles presented a unique pattern in terms of atrophy development, contractile dysfunction and Pax7 expression.<\/jats:p>","DOI":"10.14814\/phy2.15449","type":"journal-article","created":{"date-parts":[[2022,9,6]],"date-time":"2022-09-06T05:25:12Z","timestamp":1662441912000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Peripheral and respiratory muscle impairment during murine acute lung injury"],"prefix":"10.14814","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3326-5764","authenticated-orcid":false,"given":"Mart\u00edn","family":"Angulo","sequence":"first","affiliation":[{"name":"Departamento de Fisiopatolog\u00eda, Hospital de Cl\u00ednicas, Facultad de Medicina Universidad de la Rep\u00fablica  Montevideo Uruguay"},{"name":"Laboratorio de Exploraci\u00f3n Funcional Respiratoria, Centro de Tratamiento Intensivo, Hospital de Cl\u00ednicas, Facultad de Medicina Universidad 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