The relationship between physical activity and breast cancer is less clear, but several studies in American women suggest that risk may be lowered in those who are habitually active. An extensive review of this subject is now available including international studies (Kramer & Wells, 1996). Only studies utilizing American subjects are reviewed here. In 1985, Frisch et al. assessed prevalence of breast cancer in 5,398 former collegiate women athletes and nonathletes from 10 colleges and universities from classes spanning 56 years. A higher percentage of former athletes reported they were currently exercising than nonathletes. Comparing the.
