Tufts University's Miriam E. Nelson, PhD, served as vice-chair of the advisory committee for the new Physical Activity Guidelines for Americans written by the U.S. Department of Health and Human Services (HHS). Nelson is Director of the John Hancock Center for Physical Activity and Nutrition and Associate Professor of Nutrition at the Friedman School of Nutrition Science and Policy at Tufts.
"After reviewing a body of scientific research, we saw evidence that physical activity contributed to overall health and reduced the risk for most chronic conditions including heart disease, type 2 diabetes and some cancers," Nelson said. "In addition, the evidence showed that the health benefits of physical activity are seen at any given body weight. In our final report to HHS, the advisory committee also identified a need for specificity and suggested individualized guidelines for population subgroups including adults, older adults and children."
The advisory committee's recommendations are reflected in the Physical Activity Guidelines for Americans issued this month. The guidelines say:
Nelson stresses that, while aerobic exercise is the most important part of the equation, "it's also important for adults and children to supplement their workouts with strength exercises. Activities like push-ups and sit-ups build muscle and bone strength. In older adults, strength training can help improve functionality and reduce the risk of falls," Nelson said.
It remains unclear whether there is a minimum dose of exercise that will yield health benefits. "There is mounting scientific evidence that one hour per week of moderate intensity physical activity is associated with improved health and reduced risk for heart disease," Nelson said. "While not ideal, even limited physical activity appears to be better than none at all."
|Contact: Andrea Grossman|
Tufts University, Health Sciences