{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T18:47:14Z","timestamp":1791312434692,"version":"4.3.1"},"reference-count":30,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2013,3,11]],"date-time":"2013-03-11T00:00:00Z","timestamp":1362960000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Grants-in-Aid for Scientific Research in Japan","award":["20240057"],"award-info":[{"award-number":["20240057"]}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal Orthopaedic Research"],"published-print":{"date-parts":[[2013,7]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:label\/>\n                    <jats:p>The aim of this study was to elucidate whether the levels of serum biomarkers reflect the progression of osteoarthritis (OA) induced by different levels of exercise. Thirty\u2010five Wistar rats subjected to anterior cruciate ligament transaction (ACLT) were divided into three groups: Control, moderate running, and intense running. Twelve rats (moderate running without ACLT) were allocated as a naive group. Running was performed on a motorized treadmill, at a speed of 18\u2009m\/min for 30\u2009min\/day (moderate and naive) or 60\u2009min\/day (intense) for 3 days per week. After 2 or 4 weeks, OA histopathology in the knees was evaluated using the Osteoarthritis Research Society International (OARSI) score, and the serum levels of cleaved collagen type II (C2C) and procollagen II C\u2010propeptide (CPII) were analyzed. The OARSI score deteriorated in the intense running group after 2 weeks and the serum C2C\/CPII ratio suggested the development of OA. At 4 weeks, the C2C\/CPII ratio suggested there would be deterioration in the OARSI score but the score did not differ significantly between the moderate and intense running groups. C2C\/CPII ratio had 13\u201325% correlation with the OARSI histological score. Thus, in rat experimental OA, the OARSI score could be partially predicted by the C2C\/CPII ratio as a serum biomarker of OA. \u00a9 2013 Orthopaedic Research Society Published by Wiley Periodicals, Inc. 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