Analysis of blood pressure responses during exercise by logistic function curve in hypertension: effects of age, gender and physical training

Acta Physiologica Scandinavica
S I SugimotoT Imaizumi

Abstract

During exercise blood pressure fluctuates from minute to minute and does not rise linearly with time. Blood pressure responses were evaluated during exercise by a logistic function curve. Thirty-nine hypertensive patients underwent exercise testing with an ergometer, employing a multistage method (25 watts increment, every 3 min). We plotted the exercise duration on the X-coordinate and systolic blood pressure on the Y-coordinate and blood pressure was assumed to form a logistic curve for exercise duration. The relationship of systolic blood pressure vs. exercise duration was better fitted into a logistic function curve than a linear regression model. The logistic curve was defined by lower plateau, upper plateau, SPX (the X-coordinate at the shift point) and df (SPX), the maximal slope at the shift point. The effects of aging, gender and physical training were then analyzed on the curve. Aging did not affect lower plateau, upper plateau and SPX but augmented df (SPX), indicating greater blood pressure responses in older subjects during exercise. In females the curve was shifted to the left compared to males (SPX: 4.9 vs. 8.3 min, P < 0.05) without changes in plateaux and df (SPX), indicating greater blood pressure responses th...Continue Reading

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Citations

Jun 17, 2003·Journal of Physiological Anthropology and Applied Human Science·Kyu Tae KimMasahiro Yamasaki
Mar 23, 2005·The Journal of Biological Chemistry·Hyun KimIngMarie Nilsson
Apr 1, 2006·FEBS Letters·Carolina LundinIngMarie Nilsson
Nov 27, 1999·The Journal of Biological Chemistry·A DevotoP Schulze-Lefert
May 15, 2001·Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists·C F Shuler, K R Dalrymple

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