Author Interviews, Exercise - Fitness, Rheumatology / 10.01.2017
45 Minutes of Exercise Per Week Maintains Function in Adults With Arthritis
MedicalResearch.com Interview with:
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Dr. Dorothy Dunlop[/caption]
Dorothy D. Dunlop Ph.D.
Professor of Medicine and Preventive Medicine
Northwestern University Feinberg School of Medicine
Institute for Public Health and Medicine
Center for Healthcare Studies
Chicago, IL 60611
MedicalResearch.com: What is the background for this study?
Dr. Dorothy Dunlop[/caption]
Dorothy D. Dunlop Ph.D.
Professor of Medicine and Preventive Medicine
Northwestern University Feinberg School of Medicine
Institute for Public Health and Medicine
Center for Healthcare Studies
Chicago, IL 60611
MedicalResearch.com: What is the background for this study?
- We know is being active is good for health.
- Good evidence supports the current federal guidelines of doing 150 minutes of moderate physical activity each week to prevent serious conditions such as heart disease
- But only 1 in 10 older US adults with arthritis in their lower limb joints (e.g., knees) meet federal physical activity guidelines
- Inadequate physical activity is a major public health concern because It can lead to poor function, which threatens a person’s ability to live independently.
















Dr. Andrea M. Kriska PhD MS
Professor, Department of Epidemiology
Graduate School of Public Health
Pittsburgh, PA 15261
MedicalResearch.com: What is the background for this study?
Dr. Kriska: The Diabetes Prevention Program (DPP) was a well administered national research study primarily supported by the National Institutes of Health (NIDDK) that demonstrated that lifestyle intervention with weight loss and physical activity goals can prevent type 2 diabetes in diverse, high risk US adults. The importance of physical activity in preventing diabetes development in the DPP until now was thought to be due to its role in achieving weight loss and weight maintenance but activity was not considered a strong key factor alone.
The lifestyle group had a significantly greater increase in physical activity and decrease in weight than the other two groups. They also had a 58% decrease in diabetes incidence compared to the control group. The successful decrease in T2D held across all age, sex, baseline BMI and ethnicity/race subgroups.
Despite the fact that the lifestyle intervention was then offered to all participants, in the follow-up years, the lifestyle participants still maintained a lower cumulative diabetes incidence that could not be explained by differences in weight loss.
Nana Keum[/caption]
NaNa Keum, ScD|
Harvard T. H. Chan
School of Public Health Department of Nutrition
Departments of Nutrition and Epidemiology,
Harvard T.H. Chan School of Public Health
Boston, MA 02115
MedicalResearch.com: What is the background for this study?
Response: While general health benefits of physical activity are well-known, evidence on its specific benefits on cancer endpoints is limited and physical activity guidelines for cancer prevention lack details in terms of the optimal dose, type and intensity of physical activity.
MedicalResearch.com: What are the main findings?
Response: We found that the optimal exercise regime to prevent overall digestive system cancers may be to accumulate 30 MET-hours/week of physical activity primarily through aerobic exercise and regardless of its intensity.
Dr. Deborah Cohen[/caption]
Deborah A. Cohen, MD, MPH
RAND Corporation
Santa Monica, CA 90407
MedicalResearch.com: What is the background for this study?
Dr. Cohen: An extensive infrastructure of neighborhood parks supports leisure time physical activity in most U.S. cities; yet, most Americans do not meet national guidelines for physical activity. Neighborhood parks have never been assessed nationally to identify their role in physical activity. We visited a representative sample of 174 parks in 25 cities across the United States and assessed their use as well as local park management policies.
MedicalResearch.com: What are the main findings?
Dr. Cohen: We found that nationwide, the average neighborhood park of 8.8 acres averaged 20 users/hour or an estimated 1,533 person hours of weekly use. Park use was higher in parks that were larger and had more facilities and that were in neighborhoods with a higher population density and lower percentage of households in poverty. Walking loops and gymnasia each generated 221 hours/week of moderate to vigorous physical activity. Seniors represented 4% of park users, but 20% of the general population. Programming and marketing were associated with 37% and 63% more hours of moderate to vigorous physical activity/week in parks, respectively.
The lower use of parks in low-income than in high-income neighborhoods was largely explained by fewer supervised activities and marketing/outreach efforts.
Dr. Thijs Eijsvogels[/caption]
Thijs M.H. Eijsvogels, PhD
Department of Physiology
Radboud University Medical Center
Nijmegen, The Netherlands
MedicalResearch.com: What is the background for this study?
Dr. Eijsvogels: Regular exercise training is known to reduce the risk for future morbidity and mortality in the general and athletic population. For this purpose, national guidelines recommend to exercise 150 min/week at a moderate intensity or 75 min/week at a high intensity. Recent studies explored the dose-response relationship between weekly exercise volume and cardiovascular health and reported a potential U-shaped association, suggesting that high exercise volumes may attenuate the beneficial health effects.
The aim of the present study was to determine the relationship between lifelong exercise dose and the prevalence of cardiovascular morbidity in a physically active population. Therefore, we collected data in 21,266 participants of the Nijmegen Exercise Study.

