Physical activity in epidemiology: moving from questionnaire to objective measurement.
Janz
K F
KF
Department of Health and Sport Studies, University of Iowa, Iowa City, IA 52242, USA. kathleen-janz@uiowa.edu
D016021:Epidemiologic Studies; D015444:Exercise; D006801:Humans; D009043:Motor Activity / Q000502:physiology; D012107:Research Design; D011795:Surveys and Questionnaires