Finger Blood Pressure During Leg Resistance Exercise

Abstract

Blood pressure (BP) assessment during resistance exercise can be useful to avoid high BP, reducing cardiovascular risk, especially in hypertensive individuals. However, non-invasive accurate technique for this purpose is not available. The aim of this study was to compare finger photoplethysmographic (FPP) and intra-arterial BP values and responses during resistance exercise. Eight non-medicated hypertensive subjects (5 males, 30–60 years) were evaluated during pre-exercise resting period and during three sets of the knee extension exercise performed at 80% of 1RM until fatigue. BP was measured simultaneously by FPP and intra-arterial methods. Data are mean±SD. Systolic BP was significantly higher with FPP than with intra-arterial: at pre-exercise (157±13 vs. 152±10 mmHg; p<0.01) and the mean (202±29 vs. 198±26 mmHg; p<0.01), and the maximal (240±26 vs. 234±16 mmHg; p<0.05) values achieved during exercise. The increase in systolic BP during resistance exercise was similar between FPP and intra-arterial (+73±29 vs. +71±18 mmHg; p=0.59). Diastolic BP values and increases were lower with FPP. In conclusion, FPP provides similar values of BP increment during resistance exercise than intra-arterial method. However, it overestimates by 2.6±6.1% the maximal systolic BP achieved during this mode of exercise and underestimates by 8.8±5.8% the maximal diastolic BP.

finger photoplethysmography - intra-arterial - blood pressure measurement - strength exercise

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