Equipment Note The Rapid Sampling, Storage and Analysis of Expired Air
| Autor: | C. T. M. Davies, Shirling Ds |
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| Rok vydání: | 1967 |
| Předmět: | |
| Zdroj: | Ergonomics. 10:349-360 |
| ISSN: | 1366-5847 0014-0139 |
| Popis: | 1. The methods which are commonly used in work physiology for rapid sampling, laboratory storage and analysis of expired air have been examined 2. The rapid fractional sampling of expired air from both a mixing chamber and a side arm sampling device produces significant differences in [Vdot]oa values when compared to the standard Douglas method. However, provided the volume of the mixing chamber is above 4 litres, the differences are small for this technique, (293 ±18.1 mls) compared with the side arm technique (263.4± 62.9 mls), and introduce negligible error into the estimation of energy expenditure 3. The selective loss of CO2 from butyl rubber bladders, Douglas bags and syringes was found to be 0.11 per cent/hr., 0.2 per cent/hr. and 0.007 per cent/hr. respectively during the 8 hr. period. Loss of CO2 during the first 30 min was high in the case of the bladders and they were found to be very unsatisfactory storage containers. Douglas bags showed a negligible loss of CO2 during the first 2 hours, but t... |
| Databáze: | OpenAIRE |
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