To investigate the effects of different amounts of exercise on both cardiorespiratory fitness and risk factors for cardiovascular disease in sedentary, overweight, mildly hypertensive, but healthy, postmenopausal women aged 45 to 75 years.

BACKGROUND:

The primary goal of the Dose-Response to Exercise in Women aged 45-75 Years (DREW) is to investigate the effects of different amounts of exercise on both cardiorespiratory fitness and risk factors for cardiovascular disease. Participants will be sedentary, overweight or obese, postmenopausal women who have high normal blood pressure or Stage I hypertension, and thus are at moderately high risk for cardiovascular disease. A total of 450 women (35% will be from minority groups) will be randomly assigned to a control group (N = 100) or to 1 of 3 exercise groups (N = 150 for the lowest exercise dose and 100 each in the two highest exercise groups). Women assigned to the exercise groups will exercise for 6 months at energy expenditures of 4, 8, or 12 kcal ·kg-1 · week-1. These exercise doses represent the consensus public health recommendation for physical activity from recently published guidelines from the U.S. Public Health Service, American Heart Association, and American College of Sports Medicine (8 kcal ·kg-1 · week-1) and at doses 50% below (4 kcal ·kg-1 · week-1) and 50% above (12 kcal ·kg-1 · week-1) the consensus dose. All women will exercise at 50% of V02 max. The exercise sessions will take place in the exercise laboratory, with individual supervision of each session and strict control of frequency, duration, and intensity. This will provide thorough documentation of the exact amount of exercise completed. Primary outcome measures are VO2 max and resting systolic blood pressure. Other cardiovascular disease risk factors, psychosocial variables, health-related quality of life, body composition, and fat distribution are secondary outcomes. Other secondary analyses will include a focus on the extent to which observed dose-response effects are modified by baseline levels of fitness, ethnicity, risk factors, or age. Assessments will take place at baseline and 6 months. The research will provide information about (1) patterns of change in outcomes produced by each of several exercise doses, (2) whether performing exercise at less than the current consensus dose has any benefit, (3) whether performing more exercise than the consensus dose has greater (or proportionally greater) health benefits, and (4) the characteristics of sedentary women who are most likely to benefit from various exercise doses.

DESIGN NARRATIVE:

A total of 450 sedentary, postmenopausal women at moderate risk for cardiovascular disease will be randomly assigned to receive exercise training at one of three doses (4, 8, or 12 kcal/kg/wk) or no exercise for six months duration. The specific aims will be to determine: (a) if women in the exercise groups have increased aerobic power (VO2max) over the six months compared to the no exercise group; (b) if women in the exercise groups have a greater reduction in resting systolic blood pressure than those in the no exercise group; and, (c) if there will be a dose-response gradient across the three exercise groups for changes in aerobic power and systolic blood pressure. Secondary aims include evaluating the effects of exercise dose on fasting blood lipids and lipoproteins, glucose, insulin, anthropometry, self-reported quality of life, and cardiovascular risk as determined by a multiple logistic risk function. Covariates to be controlled will include dietary intake, physical activity (outside of the exercise program), smoking, alcohol intake, sleep habits, medication use (including hormone replacement therapy), demographics, menstrual history, personal and family medical history.

• Cardiovascular Diseases
• Hypertension
• Postmenopause

• Morss GM, Jordan AN, Skinner JS, Dunn AL, Church TS, Earnest CP, Kampert JB, Jurca R, Blair SN. Dose Response to Exercise in Women aged 45-75 yr (DREW): design and rationale. Med Sci Sports Exerc. 2004 Feb;36(2):336-44.
• Jurca R, Church TS, Morss GM, Jordan AN, Earnest CP. Eight weeks of moderate-intensity exercise training increases heart rate variability in sedentary postmenopausal women. Am Heart J. 2004 May;147(5):e21.
• Jordan AN, Jurca GM, Locke CT, Church TS, Blair SN. Pedometer indices for weekly physical activity recommendations in postmenopausal women. Med Sci Sports Exerc. 2005 Sep;37(9):1627-32.
• Church TS, Martin CK, Thompson AM, Earnest CP, Mikus CR, Blair SN. Changes in weight, waist circumference and compensatory responses with different doses of exercise among sedentary, overweight postmenopausal women. PLoS ONE. 2009;4(2):e4515. Epub 2009 Feb 18.
• Martin CK, Church TS, Thompson AM, Earnest CP, Blair SN. Exercise dose and quality of life: a randomized controlled trial. Arch Intern Med. 2009 Feb 9;169(3):269-78.
• Earnest CP, Lavie CJ, Blair SN, Church TS. Heart rate variability characteristics in sedentary postmenopausal women following six months of exercise training: the DREW study. PLoS ONE. 2008 Jun 4;3(6):e2288.
• Church TS, Earnest CP, Skinner JS, Blair SN. Effects of different doses of physical activity on cardiorespiratory fitness among sedentary, overweight or obese postmenopausal women with elevated blood pressure: a randomized controlled trial. JAMA. 2007 May 16;297(19):2081-91.

Postmenopausal women aged 45 to 75 years who are overweight or obese (body mass index of 25 to 40 kg/m2) and have normal or mildly elevated BP.