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If this atrophy and weakness also occurs in diaphragm muscle, it could lead to respiratory failure, which is a major cause of death in patients with cancer. Thus, the purpose of the current study was to determine whether colon\u201026 (C\u201026) cancer cachexia causes diaphragm muscle fiber atrophy and weakness and compromises ventilation. All diaphragm muscle fiber types were significantly atrophied in C\u201026 mice compared to controls, and the atrophy\u2010related genes, atrogin\u20101 and MuRF1, significantly increased. Maximum isometric specific force of diaphragm strips, absolute maximal calcium activated force, and maximal specific calcium\u2010activated force of permeabilized diaphragm fibers were all significantly decreased in C\u201026 mice compared to controls. Further, isotonic contractile properties of the diaphragm were affected to an even greater extent than isometric function. Ventilation measurements demonstrated that C\u201026 mice have a significantly lower tidal volume compared to controls under basal conditions and, unlike control mice, an inability to increase breathing frequency, tidal volume, and, thus, minute ventilation in response to a respiratory challenge. These data demonstrate that C\u201026 cancer cachexia causes profound respiratory muscle atrophy and weakness and ventilatory dysfunction.\u2014Roberts, B. M., Ahn, B., Smuder, A. J., Al\u2010Rajhi, M., Gill, L. C., Beharry, A. W., Powers, S. K., Fuller, D. D., Ferreira, L. F., Judge, A. R. Diaphragm and ventilatory dysfunction during cancer cachexia.\n                    <jats:italic>FASEB J.<\/jats:italic>\n                    27, 2600\u20102610 (2013).\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/www.fasebj.org\">www.fasebj.org<\/jats:ext-link>\n                  <\/jats:p>","DOI":"10.1096\/fj.12-222844","type":"journal-article","created":{"date-parts":[[2013,3,21]],"date-time":"2013-03-21T01:46:29Z","timestamp":1363830389000},"page":"2600-2610","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":99,"title":["Diaphragm and ventilatory dysfunction during cancer cachexia"],"prefix":"10.1096","volume":"27","author":[{"given":"Brandon M.","family":"Roberts","sequence":"first","affiliation":[{"name":"Department of Physical Therapy University of Florida Gainesville Florida 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