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Angiogenesis in Skeletal Muscle Precede Improvements in Peak Oxygen Uptake in Peripheral Artery Disease Patients

Duscha, Brian D, Robbins, Jennifer L, Jones, William S, Kraus, William E, Lye, R John, Sanders, John M, Allen, Jason, Regensteiner, Judith G, Hiatt, William R and Annex, Brian H (2011) Angiogenesis in Skeletal Muscle Precede Improvements in Peak Oxygen Uptake in Peripheral Artery Disease Patients. Arteriosclerosis, Thrombosis, and Vascular Biology, 31 (11). pp. 2742-2748. ISSN 1079-5642 (print) 1524-4636 (online)

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Objective—Peripheral artery disease (PAD) is characterized by impaired blood flow to the lower extremities, causing claudication and exercise intolerance. The mechanism(s) by which exercise training improves functional capacity is not understood. This study tested the hypothesis that in PAD patients who undergo supervised exercise training, increases in capillary density (CD) in calf muscle take place before improvements in peak oxygen uptake (VO2). Methods and Results—Thirty-five PAD patients were randomly assigned to 12 weeks of directly supervised or home-based exercise training. Peak VO2 testing and gastrocnemius muscle biopsies were performed at baseline and after training. CD (endothelial cells/mm2) was measured using immunofluorescence staining. After 3 weeks of directly supervised training, patients had an increase in CD (216±66 versus 284±77, P<0.01) but no increase in peak VO2. However, after 12 weeks, peak VO2 increased (15.3±2.8 versus 16.8±3.8, P<0.01), whereas in muscle, CD remained increased over baseline, but there were no changes in markers of oxidative capacity. Within subjects, CD was related to peak VO2 before and after directly supervised training. Conclusion—Changes in CD in ischemic muscle with training may modulate the response to training, and those changes precede the increase in VO2.

Item Type: Article
Uncontrolled Keywords: angiogenesis, capillaries, peripheral vascular disease, exercise
Subjects: Current > FOR Classification > 1102 Cardiorespiratory Medicine and Haematology
Current > FOR Classification > 1106 Human Movement and Sports Science
Current > Division/Research > College of Sports and Exercise Science
Depositing User: Ms Julie Gardner
Date Deposited: 24 Sep 2014 03:41
Last Modified: 30 Sep 2014 03:33
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Citations in Scopus: 71 - View on Scopus

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