Posted on by Dr. Francis Collins
Exercise can work wonders for your health, including strengthening muscles and bones, and boosting metabolism, mood, and memory skills. Now comes word that staying active may also help to lower your odds of developing cancer.
After reviewing the scientific evidence, a panel of experts recently concluded that physical activity is associated with reduced risks for seven common types of cancer: colon, breast, kidney, endometrial, bladder, stomach, and esophageal adenocarcinoma. What’s more, the experts found that exercise—both before and after a cancer diagnosis—was linked to improved survival among people with breast, colorectal, or prostate cancers.
About a decade ago, the American College of Sports Medicine (ACSM) convened its first panel of experts to review the evidence on the role of exercise in cancer. At the time, there was limited evidence to suggest a connection between exercise and a reduced risk for breast, colon, and perhaps a few other cancer types. There also were some hints that exercise might help to improve survival among people with a diagnosis of cancer.
Today, the evidence linking exercise and cancer has grown considerably. That’s why the ACSM last year convened a group of 40 experts to perform a comprehensive review of the research literature and summarize the level of the evidence. The team, including Charles Matthews and Frank Perna with the NIH’s National Cancer Institute, reported its findings and associated guidelines and recommendations in three papers just published in Medicine & Science in Sports & Exercise and CA: A Cancer Journal for Clinicians [1,2,3].
Here are some additional highlights from the papers:
There’s moderate evidence to support an association between exercise and reduced risk for some other cancer types, including cancers of the lung and liver.
While the optimal amount of exercise needed to reduce cancer risk is still unclear, being physically active is clearly one of the most important steps in general that people of all ages and abilities can take.
Is sitting the new smoking? Reducing the amount of time spent sitting also may help to lower the risk of some cancers, including endometrial, colon, and lung cancers. However, there’s not enough evidence to draw clear conclusions yet.
Every cancer survivor should, within reason, “avoid inactivity.” There’s plenty of evidence to show that aerobic and resistance exercise training improves many cancer-related health outcomes, reducing anxiety, depression, and fatigue while improving physical functioning and quality of life.
Physical activity before and after a diagnosis of cancer also may help to improve survival in some cancers, with perhaps the greatest benefits coming from exercise during and/or after cancer treatment.
Based on the evidence, the panel recommends that cancer survivors engage in moderate-intensity exercise, including aerobic and resistance training, at least two to three times a week. They should exercise for about 30 minutes per session.
The recommendation is based on added confirmation that exercise is generally safe for cancer survivors. The data indicate exercise can lead to improvements in anxiety, depression, fatigue, overall quality of life, and in some cases survival.
The panel also recommends that treatment teams and fitness professionals more systematically incorporate “exercise prescriptions” into cancer care. They should develop the resources to design exercise prescriptions that deliver the right amount of exercise to meet the specific needs, preferences, and abilities of people with cancer.
The ACSM has launched the “Moving Through Cancer” initiative. This initiative will help raise awareness about the importance of exercise during cancer treatment and help support doctors in advising their patients on those benefits.
It’s worth noting that there are still many fascinating questions to explore. While exercise is known to support better health in a variety of ways, correlation is not the same as causation. Questions remain about the underlying mechanisms that may help to explain the observed associations between physical activity, lowered cancer risk, and improved cancer survival.
An intensive NIH research effort, called the Molecular Transducers of Physical Activity Consortium (MoTrPAC), is underway to identify molecular mechanisms that might explain the wide-ranging benefits of physical exercise. It might well shed light on cancer, too.
As that evidence continues to come in, the findings are yet another reminder of the importance of exercise to our health. Everybody—people who are healthy, those with cancer, and cancer survivors alike—should make an extra effort to remain as physically active as our ages, abilities, and current health will allow. If I needed any more motivation to keep up my program of vigorous exercise twice a week, guided by an experienced trainer, here it is!
 Exercise Is Medicine in Oncology: Engaging Clinicians to Help Patients Move Through Cancer. Schmitz KH, Campbell AM, Stuiver MM, Pinto BM, Schwartz AL, Morris GS, Ligibel JA, Cheville A, Galvão, DA, Alfano CM, Patel AV, Hue T, Gerber LH, Sallis R, Gusani NJ, Stout NL, Chan L, Flowers F, Doyle C, Helmrich S, Bain W, Sokolof J, Winters-Stone KM, Campbell KL, Matthews CE. CA Cancer J Clin. 2019 Oct 16 [Epub ahead of publication]
 American College of Sports Medicine Roundtable Report on Physical Activity, Sedentary Behavior, and Cancer Prevention and Control. Patel AV, Friedenreich CM, Moore SC, Hayes SC, Silver JK, Campbell KL, Gerber LH, George SM, Fulton JE, Denlinger C, Morris GS, Hue T, Schmitz KH, Matthews CE. Med Sci Sports Exerc. 2019 Oct 16. [Epub ahead of publication]
 Exercise Guidelines for Cancer Survivors: Consensus Statement from International Multidisciplinary Roundtable. Campbell KL, Winters-Stone KM, Wiskemann J, May AM, Schwartz AL, Courneya KS, Zucker DS, Matthews CE, Ligibel JA, Gerber LH, Morris GS, Patel AV, Hue TF, Perna FM, Schmitz KH. Med Sci Sports Exerc. 2019 Oct 16. [Epub ahead of publication]
Physical Activity and Cancer (National Cancer Institute/NIH)
Moving Through Cancer (American College of Sports Medicine, Indianapolis, IN)
Charles Matthews (NCI)
Frank Perna (NCI)
NIH Support: National Cancer Institute