Metabolically-Derived Human Ventilation Rates: A Revised Approach Based Upon Oxygen Consumption Rates (External Review Draft)
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One important determinant of a person’s exposure to contaminants in air is the ventilation rate, or the volume of air that is inhaled by an individual in a specified time period. Ventilation rates, also known as breathing or inhalation rates, are given in Chapter 5 of the Exposure Factors Handbook. Calculations of the currently recommended ventilation rates were limited by their dependence on a ventilatory equivalent which relied on a person’s fitness level. This draft report, Metabolically-Derived Human Ventilation Rates: A Revised Approach Based Upon Oxygen Consumption Rates presents a revised approach which calculates ventilation rates directly from an individual’s oxygen consumption rate, and applies this method to data provided from more recent sources as the 1999-2002 National Health and Nutrition Examination Survey (NHANES) and EPA’s Consolidated Human Activity Database (CHAD). In the next edition of the Exposure Factors Handbook, NCEA would like to update the metabolically-derived ventilation rate values using this revised approach and the more recently released data.
The purpose of this report is to provide a revised approach for calculating an individual’s ventilation rate directly from their oxygen consumption rate. This revised approach will be used to update the ventilation rate information in the Exposure Factors Handbook and the Child-Specific Exposure Factors Handbook, which serve as resources for exposure assessors for calculating inhalation and other exposures.
Calculations of the currently recommended ventilation rates in the Exposure Factors Handbook are limited by their dependence on a ventilatory equivalent which rely on a person’s fitness level. This draft report presents a revised approach which calculates ventilation rates directly from an individual’s oxygen consumption rate.
|Jan 2007||EPA releases the External Review Draft for public comment.|
|Apr 2007||EPA hosts the External Peer Review meeting to discuss the draft report and comments.|
|Jun 2009||EPA releases the Final Report.|
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