Activity patterns in a panel of outdoor workers exposed to oxidant pollution
- Environmental Health Service, Rancho Los Amigos Medical Center, Downey, CA (United States)
We investigated summer activity patterns in a panel of volunteers drawn from a population segment with potentially high exposure to ambient oxidant pollution. The subjects were 15 men and 5 women aged 19-50, all of whom worked outdoors in the Los Angeles area at least 10 hr per week. The general approach was to (i) calibrate the relationship between ventilation rate (VR) and heart rate (HR) for each subject in controlled exercise; (ii) have subjects monitor their own normal activities with diaries and electronic HR recorders; (iii) estimate VR from HR recordings; and (iv) relate VR with diary descriptions of activities. Calibration data were fit to the equation log (VR) = (intercept) + (slope x HR), intercept and slope being determined separately for each individual to provide a specific equation to predict her/his VR from measured HR. Individuals' correlation coefficients relating log (VR) with HR ranged from 0.83 to 0.95. Subjects monitored themselves for three 24-hr periods during one week, including their most active work day and their most active non-work day. They wore Heart Watch(R) athletic training instruments which recorded HR once per minute; and recorded each change in their activity, location, or breathing rate in diaries. Breathing rates were classified as sleep, slow, medium, or fast. Diaries showed that sleep occupied about 33% of subject's time, slow activity 59%, medium 7%, and fast 1%. Fast activity was reported only at leisure, never at work. For the group, arithmetic means and standard deviations of predicted VR were 7 +/- 3 L/min for sleep, 12 +/- 7 for slow activity, 14 +/- 8 for medium, and 44 +/- 36 for fast. For the group and for most individuals, distributions of predicted VR within a given activity level (breathing rate) were approximately lognormal, with many values in a narrow range below the arithmetic mean and fewer values in a broader range above it.
- OSTI ID:
- 7222462
- Journal Information:
- Journal of Esposure Analysis and Environmental Epidemiology; (United States), Vol. 1:4; ISSN 1053-4245
- Country of Publication:
- United States
- Language:
- English
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
LOS ANGELES
AIR POLLUTION
PHOTOCHEMICAL OXIDANTS
HEALTH HAZARDS
AIR POLLUTION MONITORING
ECOLOGICAL CONCENTRATION
EXERCISE
INHALATION
MAN
MATHEMATICAL MODELS
MEDICAL RECORDS
REGRESSION ANALYSIS
RESPIRATION
ANIMALS
CALIFORNIA
DEVELOPED COUNTRIES
HAZARDS
INTAKE
MAMMALS
MATHEMATICS
MONITORING
NORTH AMERICA
POLLUTION
PRIMATES
STATISTICS
URBAN AREAS
USA
VERTEBRATES
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology