Peripheral Arterial Disease Clinical Trial
Official title:
Creatine Monohydrate Use and Muscle Stretching in Peripheral Artery Disease
To utilize near-infrared spectroscopy to investigate if the research device, which induces muscle stretching, and creatine loading impact submaximal exercise performance in aged and PAD patients. Near-infrared spectroscopy (NIRS)-derived tissue oxygenation responses will be obtained during device placement (muscle stretch) and during a walking test (i.e., six-minute walk test). Muscle oxygenation at rest and during device placement will be assessed with Magnetic Resonance Imaging. It is hypothesized that the stretching protocol will improve both NIRS-derived tissue oxygenation and magnetic resonance-derived muscle oxygenation and that creatine supplementation will further improve phosphorus metabolite muscle performance. All patients will undergo either 4 weeks of stretch training with- or- without creatine supplementation according to previously defined creatine guidelines.
Lower extremity peripheral artery disease (PAD) has been estimated to impact nearly 8.5 million U.S. adults above the age of 40, significantly increasing the rate of morbidity and mortality with concomitant decreases in quality of life. These patients are often given medical therapy (e.g., statins, antiplatelet, anticoagulants) and are also recommended to begin structured exercise programs. However, the limb ischemia that occurs during physical activity in these patients often limits exercise tolerance. A previous study by Bauer and colleagues showed that impaired muscle metabolism is a major contributor to functional limitations in PAD patients. These data are important in that they show alterations in blood flow and metabolic machinery likely impact exercise tolerance. As such, the development of tolerable countermeasures to improve limb blood flow and muscle energetics may increase adherence to exercise therapy and improve health outcomes in PAD patients. Previous work by the investigators has shown that daily muscle stretching, achieved via 30-minutes of ankle dorsiflexion, significantly improved soleus muscle function and muscle blood flow during exercise in a rat model of aging . In a follow-up study, the investigators have also shown that this model improves vascular function and walking function in PAD patients. As noted above, muscle energetics are delayed in PAD patients, so improving the rest-to-exercise transition with creatine supplementation may help PAD patients sustain exercise longer. The investigators are now testing to see if an added supplement can further improve the effects of muscle stretching in PAD patients. ;
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