Abstract
Exhalation time has been determined to be a rapid and reliable measure of the state of respiratory exhaustion of a working individual. Values of exhalation time obtained for healthy, young men during exercise decreased in value until a minimum was reached at the limit of their endurance. Although the average values varied somewhat among subjects, exhalation times at exhaustion for a particular individual were found to be very consistent, the standard deviation being approximately 10% of the mean. The average minimum value of 0.66 sec for 18 subjects appeared to be independent of inhalation resistance over the range of.11—.66 mm H2O—min/liter at 0.22 mm H2O—min/liter exhalation resistance. Exhalation time at exhaustion also appears to be independent of exhalation resistance over the range 0—0.6 mm H2O—min/liter.
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