Effect of Regular Exercise on Vascular Function and Cardiovascular Risk in a Sedentary Work Force
This study will evaluate the effects of NHLBI's employee exercise program, Keep the Beat, on blood vessel function. Damage to blood vessels can cause narrowing of the vessels, resulting in reduced blood flow to parts of the body such as the heart. Stem cells called endothelial progenitor cells, or EPCs, may be able to heal blood vessel damage. Exercise, such as walking on a treadmill, can help move EPCs from the bone marrow where they originate into the blood stream to help heal the damaged blood vessels. The Keep the Beat program encourages NHLBI employees to exercise 15 minutes during the workday and provides exercise facilities to accomplish this.
NHLBI employees who have access to NIH exercise facilities may be eligible for this study. Candidates must have no history of heart disease, must not currently be exercising more than 1.5 hours per week and must not have participated in the Keep the Beat program for 3 months prior to entering the study. They are screened with blood tests and blood pressure measurements.
Participants undergo the following tests and procedures before beginning the study and 3 months after participating in Keep the Beat:
- Blood tests to identify EPCs and their function, measure the level of nitric oxide (a gas produced by healthy blood vessels), and measure C-reactive protein (an inflammatory marker that may be a risk factor for cardiovascular disease).
- Brachial artery reactivity study to measure how well the arteries widen. An ultrasound device is placed over the subject's artery just above the elbow. The device measures the size of the artery and the flow of blood through it before and after a pressure cuff is inflated around the forearm.
- Treadmill exercise testing to evaluate physical fitness. Subjects exercise on a treadmill for as long as they can. An exercise specialist is present throughout the test. Heart rhythm and oxygen saturation are monitored continuously and blood pressure is measured every 3 minutes.
|Study Design:||Primary Purpose: Treatment|
|Official Title:||Effect of Regular Exercise on Vascular Function and Cardiovascular Risk in a Sedentary Work Force: The NHLBI "Keep the Beat" Program|
- Improvement in brachial artery dilator responsiveness to shear stress as a bioassay for endothelium-dependent nitric oxide bioavailability following 3 months participation in the Keep the Beat program as compared with baseline measuraements.
|Study Start Date:||October 2005|
|Estimated Study Completion Date:||April 2009|
Please refer to this study by its ClinicalTrials.gov identifier: NCT00246883
|United States, Maryland|
|National Institutes of Health Clinical Center, 9000 Rockville Pike|
|Bethesda, Maryland, United States, 20892|