Annals Internal Medicine, Author Interviews, Cognitive Issues, Lifestyle & Health / 20.12.2017
Not Clear That Physical Activity Programs Reduce Cognitive Decline
MedicalResearch.com Interview with:
Michelle Brasure, MSPH, PhD, MLIS
Evidence-based Practice Center
School of Public Health
University of Minnesota
MedicalResearch.com: What is the background for this study? What are the main findings?
Response: We conducted a large systematic review to assess the evidence relating to interventions to prevent cognitive decline and dementia. We included experimental studies with follow up times of at least six months. This paper analyzes the physical activity interventions; other papers in this issue address other types of interventions.
Michelle Brasure, MSPH, PhD, MLIS
Evidence-based Practice Center
School of Public Health
University of Minnesota
MedicalResearch.com: What is the background for this study? What are the main findings?
Response: We conducted a large systematic review to assess the evidence relating to interventions to prevent cognitive decline and dementia. We included experimental studies with follow up times of at least six months. This paper analyzes the physical activity interventions; other papers in this issue address other types of interventions.

















Dr. David Earnest[/caption]
David Earnest, Ph.D.
Professor in the Department of Neuroscience and Experimental Therapeutics
Texas A&M Health Science Center College of Medicine
MedicalResearch.com: What is the background for this study? What are the main findings?
Dr. Earnest: When body clocks are disrupted, as they are when people engage in shift work or go to bed and get up at radically different times every few days, more severe ischemic strokes can result.
MedicalResearch.com: What should readers take away from your report?
Dr. Earnest: Whenever possible, go to bed and get up at the same time each day and keep regular mealtimes. If you do need to keep an irregular schedule, it is especially important to be mindful of stroke risk and try especially hard to eliminate other risk factors, such as hypertension and obesity.
Dr. Steven Moore[/caption]
Steven C. Moore PhD, MPH
Division of Cancer Epidemiology and Genetics
Rockville, MD
MedicalResearch.com: What is the background for this study? What are the main findings?
Dr. Moore: More than half of Americans fail to meet recommended levels of regular physical activity; physical inactivity has become a major public health concern.
Physical activity during leisure time is known to reduce risks of heart-disease and all-cause mortality, as well as risks of colon, breast, and endometrial cancers. However, less is known about whether physical activity reduces risk of other cancers.
Hundreds of prospective studies have examined associations between physical activity and risk of different cancers. Due to small case numbers, results have been inconclusive for most cancer types.
In this study, we examined how leisure-time physical activity relates to risk of 26 different cancer types in a pooled analysis of 12 prospective cohort studies with 1.44 million participants. Our objectives were to identify cancers associated with leisure-time physical activity, and determine whether associations varied by body size and/or smoking history.
Dr. Christian Benedict[/caption]
Christian Benedict Ph.D
Dept. of Neuroscience
Uppsala University, Sweden
MedicalResearch.com: What is the background for this study? What are the main findings?
Dr. Benedict: A considerably large proportion of today’s workforce performs shift work. Both epidemiological and experimental studies have demonstrated that shift workers are at an increased risk for multiple diseases, such as cardiovascular diseases. However, knowledge regarding short- and long-term effects of shift work on parameters of brain health is still fragmentary.
Dr. Tyler VanderWeele[/caption]
Dr. Tyler VanderWeele PhD
Professor of Epidemiology
Department of Epidemiology
Department of Biostatistics
Harvard T. H. Chan
School of Public Health
MedicalResearch.com: What is the background for this study? What are the main findings?
Dr. VanderWeele: There have been some prior studies on religious service attendance and mortality. Many of these have been criticized for poor methodology including the possibility of reverse causation – that only those who are healthy can attend services, so that attendance isn’t necessarily influencing health. We tried to address some of these criticisms with better methodology. We used repeated measures of attendance and health over time to address this, and a very large sample, and controlled for an extensive range of common causes of religious service attendance and health. This was arguably the strongest study on the topic to date and addressed many of the methodological critiques of prior literature. We found that compared with women who never attended religious services, women who attended more than once per week had 33% lower mortality risk during the study period. Those who attended weekly had 26% lower risk and those who attended less than once a week had 13% lower risk.
Dr. Wisit Cheungpasitporn[/caption]
Wisit Cheungpasitporn, MD, Nephrology Fellow
Project mentor: Stephen B. Erickson, MD
Departments of Nephrology and Hypertension
Mayo Clinic, Rochester, MN
MedicalResearch.com: What is the background for this study? What are the main findings?
Dr. Cheungpasitporn: The prevention and management of hypertension continue to be major public health challenges. Studies have shown the benefits of napping, including reduction of fatigue and improvement of alertness, mood and work performance. However, there have also been increasing reported associations between napping and cardiovascular disease, diabetes mellitus, strokes, and higher mortality from all causes. The risk of hypertension in adults who regularly take a nap is controversial.