Just 20 Minutes of Exercise, Enough to Reduce Inflammation, Study Finds
The long-term health benefits of physical exercise are numerous; they include reducing the risk of cardiovascular disease, improving metabolism and weight control, as well as generally strengthening the heart, muscles, and bones. According to the United States Department of Health and Human Services, a regular dose of physical activity also lowers blood pressure, and reduces the risk of type 2 diabetes and some forms of cancer. New research, published in the journal Brain, Behavior and Immunity, investigates the benefits of 20-minute exercise sessions on the body's immune system. Researchers from the University of California-San Diego School of Medicine - led by Suzi Hong, Ph.D., from the Department of Psychiatry and the Department of Family Medicine and Public Health - hypothesized that exercise would improve the body's anti-inflammatory response by activating the sympathetic nervous system. The sympathetic nervous system helps to increase heart rate, blood pressure, and breathing rate. Physical exercise activates this system to help the body keep up. During this time, the body releases hormones such as epinephrine and norepinephrine into the bloodstream, which activate the adrenergic receptors of immune cells.
The results revealed that a 20-minute session of moderate exercise can have anti-inflammatory effects. The study confirmed the researchers' hypothesis. Exercise did seem to produce an anti-inflammatory cellular response, which could be seen in the reduction of the cytokine TNF. "Our study found one session of about 20 minutes of moderate treadmill exercise resulted in a 5 percent decrease in the number of stimulated immune cells producing TNF," says Hong. Although the anti-inflammatory benefits of physical activity are already known to researchers, Hong explains, this study explains the process in more detail. "Knowing what sets regulatory mechanisms of inflammatory proteins in motion may contribute to developing new therapies for the overwhelming number of individuals with chronic inflammatory conditions, including nearly 25 million Americans who suffer from autoimmune diseases," Hong adds. The lead author also highlights the importance of this study for people with reduced strength or mobility who are under the impression that physical exercise needs to be extremely intense in order to be effective.
-"Our study shows a workout session does not actually have to be intense to have anti-inflammatory effects. Twenty minutes to half an hour of moderate exercise, including fast walking, appears to be sufficient. Feeling like a workout needs to be at a peak exertion level for a long duration can intimidate those who suffer from chronic inflammatory diseases and could greatly benefit from physical activity."
- Suzi Hong