@article{ref1,
title="Vigorous physical activity among high school students--United States, 1990",
journal="MMWR: Morbidity and mortality weekly report",
year="1992",
author="",
volume="41",
number="3",
pages="33-35",
abstract="Vigorous physical activity can improve the health of both adults and children. Among adults, regular physical activity can reduce risk for chronic diseases such as coronary heart disease, hypertension, noninsulin-dependent diabetes mellitus, colon cancer, and depression, as well as lower all-cause death rates (1,2). Among children, regular physical activity can reduce chronic disease risk factors such as obesity, elevated cholesterol, and hypertension (3). Physical activity patterns established during childhood may extend into adulthood (4). This report examines the prevalence of vigorous physical activity among U.S. students in grades 9-12.<p /><p>Language: en</p>",
language="en",
issn="0149-2195",
doi="",
url="http://dx.doi.org/"
}