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The purpose of this study was to make clear the blood pressure response by the Regulating Reflex Method of blood pressure in chair and long sitting position. The subjects were comprised of healthy 77 university students. The investigation was carried out from October to November 2008 and 2009. The measurement method was based on Fukuda's report in 1947. The criterion of the method was based on Ikai et al.'s report in 1956.The main findings were as follows: 1) The function of blood pressure regulation were 'well-regulated' 21.7%, 'poor-regulated' 41.7%, and 'unmeasured' 36.7% for chair sitting position, and 'well-regulated' 23.3%, 'poor-regulated' 41.7%, and 'unmeasured' 35.0% for long sitting position. 2) In both of sitting position, SBP partly decreased just after changing position from lying to sitting posture, and SBP recovered up to the resting value. 3) From the above, it has become clear that SBP reaction in both sitting position closely extremely resembled. 4) On the other hand, the conformity rate of a measurement criterion in chair and long sitting position was 45.0%. 5) Therefore, we have reached the conclusion that the traditional measurement criterion should be revaluated including the 'unmeasured' group.