Effect of eccentric exercise on the healing process of injured patellar tendon in rats
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概要
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Background. Earlier studies have reported positive results from eccentric training in patients with tendon disorders. The reasons for the beneficial clinical effects of eccentric training are not known. Vascularization followed by regression of the vasculature enhances the healing response of injured tendons. Eccentric exercise induces a more beneficial healing response than concentric exercise. Methods. Sixty rats with patellar tendon injuries were divided into three groups: nonexercise controls (group N; n = 20); concentric exercise group (group C; n = 20); eccentric exercise group (group E; n = 20). Each rat was taught to run uphill or downhill for 14 days. Patellar tendons were removed 1, 4, 7, 10, and 14 days following injury. Vascular endothelial growth factor (VEGF), angiopoietin-1, and angiopoietin-2 were measured by reverse transcription polymerase chain reaction. Results. In group C, VEGF mRNA was increased 1 and 4 days following injury but was decreased on days 7, 10, and 14. In group E, VEGF mRNA was elevated only on day 1. In group N, VEGF mRNA remained at a low level throughout all 14 days. The angiopoietin-2/angiopoietin- 1 ratio was higher for group C than for group E. Conclusions. In the presence of VEGF, angiopoietin-1 promotes vessel stability, whereas angiopoietin-2 has the opposite effect. Eccentric exercise contributes to stabilized angiogenesis during the early phase of tendon injury. Conversely, concentric exercise, which induces destabilized angiogenesis, leads to a delayed healing response. Initiation of eccentric exercise immediately after tendon injury may help improve healing by reducing vascularity. © 2008 The Japanese Orthopaedic Association.
- 日本整形外科学会 / Springer Japanの論文
- 2008-07-01
著者
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Tomita Katsuro
Department Of Orthopedic Surgery Kanazawa University Graduate School Of Medical Science
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Tomita Katsuro
Department Of Orthopaedic Surgery Graduate School Of Medical Science Kanazawa University
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Tomita Katsuro
Department Of Orthopedic Surgery Kanazawa University
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KITAOKA Katsuhiko
Department of Orthopedic Surgery, Kanazawa University
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NAKAMURA Kenichi
Department of Electrical Engineering and Electro-Photo Optics, Tokai University
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Kitaoka Katsuhiko
Department Of Orthopedic Surgery Kanazawa University Graduate School Of Medical Science
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Nakamura Kenichi
Department Of Orthopedic Surgery Kanazawa University Graduate School Of Medical Science
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Nakamura Kenichi
Department Of Applied Physics School Of Science And Engineering Waseda University
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Kitaoka Katsuhiko
Department Of Orthopaedic Surgery Kijima Hospital
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Nakamura Kenichi
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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NAKAMURA KENICHI
Department of Anatomy Kurume University School of Medicine
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