Key result
During incremental exercise in healthy adults, the relationship between heart rate and systolic blood pressure followed a third-order regression curve in males and a linear equation in females, with DPBP occurring at 64.4% and 60.4% of maximum heart rate, respectively.
Cross-Sectional (n=34)
No
The double product break point can be successfully detected during incremental exercise despite sex-based differences in circulatory responses, as the double product compensates for lower increases in systolic blood pressure or heart rate.
Sex-specific double product patterns during exercise may inform testing protocols; leaves open whether they refine risk stratification.
The purpose of this study was to examine the effect of circulatory response changes on DPBP evaliation. Seventeen healthy males and females who did not perform exercises daily participated in this study. All subjects performed a graded ergometric test that is generally performed on a cycle ergometer. The SBP and HR were measured at 1-min intervals. In healthy subjects who don't exercise daily, the relationship between HR and SBP, was described by a third order regression curve during exercise in males, and a continuously increasing linear equation in females. The relationship between work rate and DP was described by a third order regression curve during exercise in males, while there was no increase in suppression for females, for whom the relationship could be described by a linear equation. At DPBP, HR was 64.4 ± 4% for males and 60.4 ± 5% for females of maximum heart rate. It is possible to detect with DPBP, the increasing pattern of SBP or HR that was expressed as linear or third regression curve against the work load. It was suggested that DP can be compensated even when the increase of SBP (or HR) was low, because DP is the integral number of SBP and HR.
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Ohtsuki et al. (2007) conducted a cross-sectional in Healthy adults without daily exercise habits (n=34). Incremental exercise load (graded ergometric test) vs. Males vs Females was evaluated on Circulatory response (Heart Rate and Systolic Blood Pressure) and Double Product Break Point (DPBP) detection. During incremental exercise in healthy adults, the relationship between heart rate and systolic blood pressure followed a third-order regression curve in males and a linear equation in females, with DPBP occurring at 64.4% and 60.4% of maximum heart rate, respectively.
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