ABsTRAcr Spirometric variables were obtained from nine symptomless subjects, who performed forced expiratory manoeuvres with three Vitalograph spirometers at three different ambient temperatures (36.5°C, 24-10C, and -7.3°C) Hutchinson noticed when using his spirometer that subjects had larger vital capacities in summer than winter and therefore decided to correct for the effects of changes in ambient temperature.' He chose to correct for all volumes to 60°F (15°C), which was apparently an average indoor temperature in London at that time. Because of this observation it has become accepted practice to convert volumes from the temperature and pressure around the recording equipment to a standard condition, which for most purposes is that obtaining in the lung.2 Because we were engaged in epidemiological surveys using the Vitalograph spirometer in different ambient conditions we wondered whether this practice was valid. We have therefore studied the effects of temperature on Vitalograph spirometer readings.
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