Tuesday, March 24, 2020
In a new study, higher daily step counts were associated with lower mortality risk from all causes. The research team, which included investigators from the National Cancer Institute (NCI) and the National Institute on Aging (NIA), both parts of the National Institutes of Health, as well as from the Centers for Disease Control and Prevention, also found that the number of steps a person takes each day, but not the intensity of stepping, had a strong association with mortality.
The findings were published March 24, 2020, in the Journal of the American Medical Association.
While we knew physical activity is good for you, we didnt know how many steps per day you need to take to lower your mortality risk or whether stepping at a higher intensity makes a difference, said Pedro Saint-Maurice, Ph.D., of NCIs Division of Cancer Epidemiology and Genetics, first author of the study. We wanted to investigate this question to provide new insights that could help people better understand the health implications of the step counts they get from fitness trackers and phone apps.
Previous studies have been done on step counts and mortality. However, they were conducted primarily with older adults or among people with debilitating chronic conditions. This study tracked a representative sample of U.S. adults aged 40 and over; approximately 4,800 participants wore accelerometers for up to seven days between 2003 and 2006. The participants were then followed for mortality through 2015 via the National Death Index. The researchers calculated associations between mortality and step number and intensity after adjustment for demographic and behavioral risk factors, body mass index, and health status at the start of the study.
They found that, compared with taking 4,000 steps per day, a number considered to be low for adults, taking 8,000 steps per day was associated with a 51% lower risk for all-cause mortality (or death from all causes). Taking 12,000 steps per day was associated with a 65% lower risk compared with taking 4,000 steps. In contrast, the authors saw no association between step intensity and risk of death after accounting for the total number of steps taken per day.
At NIA, weve long studied how exercise is important for older adults, and its good to see further evidence from a large study with a broad sample that the main thing is to get moving for better overall health as we age, said Eric Shiroma, Ph.D., a co-author and NIA Intramural Research Program scientist.
In analyses by subgroups of participants, the authors found that higher step counts were associated with lower all-cause death rates among both men and women; among both younger and older adults; and among white, black, and Mexican-American adults. In secondary outcomes of the study, higher step counts were also associated with lower rates of death from cardiovascular disease and cancer.
Data collection was conducted through the CDCs National Health and Nutrition Examination Survey (NHANES), a program of studies designed to assess a nationally representative sample of the health and nutritional status of adults and children in the United States.
The researchers were surprised they didnt find an association between higher stepping intensity and all-cause mortality after adjusting for the total number of steps per day. Because few studies have investigated an association between mortality and intensity among adults going about their daily lives, the study authors wrote that future studies of walking intensity and mortality are warranted.
Although the study authors controlled for factors that could have affected the results, the study is observational and cannot prove causality. Nevertheless, their findings are consistent with current recommendations that adults should move more and sit less throughout the day. Adults who do any amount of physical activity gain some health benefits. For even greater health benefits, adults are recommended to get at least 150 minutes of moderate-intensity physical activity per week.
Being physically active has many benefits, including reducing a persons risk of obesity, heart disease, type 2 diabetes, and some cancers. And on a daily basis, it can help people feel better and sleep better, said Janet Fulton, Ph.D., of CDCs Division of Nutrition, Physical Activity, and Obesity. CDC is working with communities and partners across the country, as part of the Active People, Healthy Nation initiative, to make it easier, safer, and more convenient for people to be active in their own communities."
About the Centers for Disease Control and Prevention (CDC): CDC works 24/7 protecting Americas health, safety, and security. Whether diseases start at home or abroad, are curable or preventable, chronic or acute, or from human activity or deliberate attack, CDC responds to Americas most pressing health threats. CDC is headquartered in Atlanta and has experts located throughout the United States and the world. The Division of Nutrition, Physical Activity, and Obesity is located in CDCs National Center for Chronic Disease Prevention and Health Promotion.
About the National Cancer Institute (NCI):NCIleads the National Cancer Program and NIHs efforts to dramatically reduce the prevalence of cancer and improve the lives of cancer patients and their families, through research into prevention and cancer biology, the development of new interventions, and the training and mentoring of new researchers. For more information about cancer, please visit the NCI website atcancer.govor call NCIs contact center, the Cancer Information Service, at 1-800-4-CANCER (1-800-422-6237).
About the National Institute on Aging (NIA):NIA leads the U.S. federal government effort to conduct and support research on aging and the health and well-being of older people. Learn more about age-related cognitive change and neurodegenerative diseases via NIAsAlzheimer's and related Dementias Education and Referral (ADEAR) Center website. For information about a broad range of aging topics, visit themain NIA websiteandstay connected.
About the National Institutes of Health (NIH):NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit http://www.nih.gov.
NIHTurning Discovery Into Health
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