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Rigakuryoho Kagaku 24(2): 167–171, 2009. Submitted Sep. 1, 2008. Accepted Oct. 21, 2008. ABSTRACT: [Purpose] With normal healthy males and females as subjects, we investigated the circulation response at the double product break point (DPBP) and its relationship with the Borg scale as well as gender differences. [Subjects] The subjects were 20 each of normally healthy males and females with average ages of 25.0  2.1 and 24.1  4.5, respectively. [Methods] Using a bicycle ergometer with incremental increases of 10 W every 2 min, we performed a ramped exercise load test. The Borg scale was measured about one minute after each increment of exercise load. [Results] The Borg scale at the time the DPBP was detected was 13.9  1.7 for males, and 13.0  1.6 for females. For the circulation response relationships, systolic blood pressure, pulse pressure and double product were found to be significantly related to the Borg scale for males, whereas for females, a significant positive correlation was found for heart rate and the double product. [Conclusion] At the time of detection of DPBP, the double product was profoundly related to the Borg scale for both males and females.

Relationship between Borg Scale and Circulation Response at Double Product Break Point and Investigation of Gender Difference