| Analysis of blood pressure responses during exercise by logistic function curve in hypertension: effects of age, gender and physical training. | |
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MedLine Citation:
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PMID: 9648619 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 than males. Physical training for 3 weeks decreased the lower plateau from 157 to 144 mmHg (P < 0.05) and shifted the curve to the right (SPX: 7.1 vs. 8.6 min, P < 0.05), indicating unchanged blood pressure responses after training because of the opposite effects by decreases in the lower plateau vs. the curve shift to the right. In conclusion, blood pressure during exercise is better delineated by a logistic function curve than a linear regression model. The biological or physiological significance of df (SPX) is not clear at present and needs further investigations. |
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Authors:
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S I Sugimoto; K Takenaka; K Hirano; Y Miyake; T Imaizumi |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Acta physiologica Scandinavica Volume: 163 ISSN: 0001-6772 ISO Abbreviation: Acta Physiol. Scand. Publication Date: 1998 May |
Date Detail:
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Created Date: 1998-09-21 Completed Date: 1998-09-21 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0370362 Medline TA: Acta Physiol Scand Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 17-24 Citation Subset: IM |
Affiliation:
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Department of Internal Medicine III, Kurume University School of Medicine, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Aging / physiology* Blood Pressure / physiology* Blood Pressure Monitoring, Ambulatory Exercise* Female Humans Hypertension / physiopathology* Male Middle Aged Physical Education and Training* Physical Endurance / physiology Regression Analysis Sex Characteristics* |
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