Dose Response to Exercise and Cardiovascular Health

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00005555
Recruitment Status : Completed
First Posted : May 26, 2000
Last Update Posted : January 8, 2016
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by:
University of Florida

Brief Summary:
To determine the minimal dose of physical activity necessary to improve cardiovascular (CV) health by evaluating and aerobically training 500 healthy men and women, 30-65 years of age.

Condition or disease Intervention/treatment Phase
Cardiovascular Diseases Heart Diseases Behavioral: Exercise Not Applicable

Detailed Description:


Results from the study will provide important data regarding the dose of exercise required to improve cardiovascular health, as described both by the NIH Consensus Conference on Physical Activity and CV Health and by the recent Report of the Surgeon General. The study was initiated in response to a Program Announcement released in October 1994 on Physical Activity and Cardiopulmonary Health.


Subjects were randomized into one of five groups in a 2x2 factorial design plus a usual care control group (n=100 in each of 5 groups). Subjects trained at a moderate (45-55 percent) or high (65-75 percent of maximum heart rate reserve) intensity, and at a frequency of 3-4 or 5-7 days/week (viz., Group 1, 65-75 percent at 5-7 days/week; Group 2, 65-75 percent at 3-4 days/week; Group 3, 45-55 percent at 5-7 days/weekk; Group 4, 45-55 percent at 3-4 days/week; and, Group 5, usual care control). Controls received advice from a physician to increase their physical activity. The subjects in Groups 1-4 participated in an exercise intervention using walking as the mode of training for a total of 24 months. A lifestyle model of physical activity was used, in that subjects could accumulate exercise minutes during the day in 10-minute increments or more continuously (for a total duration of 30 minutes/day), and training was conducted where it was most convenient for the subject (i.e. at home, work or some combination thereof). Tests occurred at baseline (0), 12, and 24 months of the intervention.

The hypothesis was that Groups 1-4 would show a significant reduction in systolic and diastolic blood pressure and an increase in HDL-cholesterol compared to the usual care control group. A second hypothesis was that that there would be significant main effects for both frequency and intensity, with the higher levels of each producing greater improvement on the major outcome variables compared to the lower levels of each dose. The study also planned to determine the minimal dose response to exercise necessary to elicit significant improvement in cardiovascular and behavioral health factors. Finally, the project included examination of the effects of age and level of initial test values on outcome variables to determine if their interactions affected the results of the intervention.

The study also includes assessment of the effect of specific doses of exercise on the reduction in systolic and diastolic blood pressure and increase in HDL-cholesterol (primary outcomes), in addition to changes in levels of physical activity, aerobic fitness (VO2 max), body composition (percent fat and waist-to-hip ratio), triglycerides, and LDL-cholesterol (secondary outcomes). Psychological variables (depression, anxiety, anger, and perceived stress) and health-related quality of life are also evaluated, and the important issue of adherence to exercise is examined with respect to the effect of dose of exercise.

Study Type : Interventional  (Clinical Trial)
Primary Purpose: Prevention
Study Start Date : May 1998
Study Completion Date : April 2003

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Information from the National Library of Medicine

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Ages Eligible for Study:   30 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
No eligibility criteria

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00005555

Sponsors and Collaborators
University of Florida
National Heart, Lung, and Blood Institute (NHLBI)
OverallOfficial: Michael Perri University of Florida