title: The national exposure research laboratory's consolidated human activity database.
abstract: EPA's National Exposure Research Laboratory (NERL) has combined data from 12 U.S. studies related to human activities into one comprehensive data system that can be accessed via the Internet. The data system is called the Consolidated Human Activity Database (CHAD) and is available at http:// www.epa.gov/nerl/. CHAD contains 22,968 person days of activity and is designed to assist exposure assessors and modelers in constructing population "cohorts" of people with specified characteristics that are suitable for subsequent analysis or modeling. This paper describes the studies comprising CHAD and the various intellectual foundations that underlay the gathering of human activity pattern data. Next, it provides a brief overview of the Internet version of CHAD, and discusses how the program was formulated. Emphasis is placed on how activity-specific energy expenditure estimates were developed. Finally, the paper recommends steps that should be taken to improve the collection of activity data that would improve energy expenditure estimates and related information needed for physiologically based exposure dose modeling efforts.
authors.affiliation: Office of Research and Development, US Environmental Protection Agency Research Triangle Park, North Carolina 27711, USA. mccurdy.thomas@epa.gov
authors.forename: T
authors.initials: T
authors.lastname: McCurdy
authors.forename: G
authors.initials: G
authors.lastname: Glen
authors.forename: L
authors.initials: L
authors.lastname: Smith
authors.forename: Y
authors.initials: Y
authors.lastname: Lakkadi
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D016208:Databases, Factual; D004734:Energy Metabolism; D004781:Environmental Exposure; D004785:Environmental Pollutants / Q000009:adverse effects; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D020407:Internet; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D014481:United States; D014484:United States Environmental Protection Agency
chemical_list: D004785:Environmental Pollutants