Abstract
For the purpose of estimating the grade of disability of silicotics, the author analyzed the behavior of pulse, blood pressure, vital capacity, maximum breathing capacity, and breathing reserve index under the two kinds of perfo mance tests (Step-Up test and Increased dead space test). These methods have been used as the tests for cardio-pulmnoary function in practical field, but the reliability and v lidlity of three methods have not statistically been studied enough.
The purpose of these stu ies is to clarify these relations and to investigate the chracters of these methods as a screening test. The results obtained are summarized as follows :
1) As to vital capacity and M.B.C., the value of sil cotic groups is significantly lower than the normol groups (α=0.05), and there are statistical differences between SI and SIII (SI>SIII, α=0.05).
2) Regarding the variation of tidal volume and puls-rate, there was no statistic 1 differences be ween normal and silicotc groups under the said experimental condition.
3) On the Variation of blood pressure, the difference between normal and Sgrade of silicotic was statistccally significant in the test of Step-Up.
4) About B.R. I. no difference was observed among each grade of sclicosis.
5) The method of vital capacity and M.B.C. can be employed as screening methods to estimate the grade of silicotics, while the other methods tried in this experiment proved little value for this purpose.
