... Principal, Thomas Stephens and Associates, Ottawa, Canada.Anita Stewart, Ph.D., Associate Professor inResidence, University of California, San Francisco,San Francisco, California.C. Barr Taylor, ... to a regular pattern of activity. The evidence that physical activity reduces the risk of cardiovascular and other diseases is presented inChapter 4. Data on patterns and trends of physicalactivity ... representa-tives from the Office of the Surgeon General, the Office of Public Health and Science (Office of the Secretary), the Office of Disease Prevention (Na-tional Institutes of Health [NIH]), and...