Study on Breath-Holding Test.:(I) Comparison of the results obtained under ordinary and under-water conditions
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概要
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1. Breath-holding test was applied both under ordinary and under-water conditions to the same subjects, and the breath-holding time, CO<SUB>1</SUB> content and O<SUB>2</SUB> content of the alveolar air were determined in each subject<BR>2. For collecting the sample of the alveolar air, a modified collecting tube was designed, making it more suitable for a field work.<BR>3. In primary school children, the breath-holding time increases with the age both under ordinary and under-water conditions. The longer breath-holding time is accompanied with increased CO<SUB>2</SUB> content of the alveolar air after the test.<BR>4. Generally speaking, breath can be held longer under ordinary conditions than under the water. Here also the longer breath-holding is accompanied with greater CO<SUB>2</SUB> content of the alveolar air after the test.<BR>5. The age difference in the breath-holding time may be due to the sensitivity and/or the volitional effort of endurance.<BR>6. For the shorter endurance in the. under-water breath-holding, not only psychological, but also technical factors on the part of the tested subject may be responsible.
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