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The influence of oral glucose loading on baroreflex function in the elderly
1Department of Geriatric Medicine, University Hospital Nijmegen, The Netherlands.
Journal of the American Geriatrics Society
|November 1, 1989
Summary
Oral glucose loading lowered blood pressure in elderly individuals, but did not affect baroreflex sensitivity. This suggests other factors contribute to postprandial hypotension in older adults.
Area of Science:
- Cardiovascular Physiology
- Gerontology
Background:
- Postprandial hypotension, a drop in blood pressure after eating, is common in the elderly.
- Insulin's effect on baroreflex sensitivity has been hypothesized as a cause.
Purpose of the Study:
- To investigate the impact of oral glucose loading on baroreflex sensitivity in young and elderly individuals (normotensive and hypertensive).
Main Methods:
- Continuous blood pressure monitoring using Finapres.
- Baroreflex sensitivity assessed via phenylephrine and nitroglycerin methods.
- Comparison between young normotensives, elderly normotensives, and elderly hypertensives.
Main Results:
- Elderly groups showed significant mean arterial pressure decrease post-glucose load (hypertensives: 11±1 mmHg; normotensives: 8±2 mmHg).
- Young adults had no significant blood pressure change.
- Baroreflex sensitivity was lower in elderly groups compared to young adults.
- Glucose loading did not alter baroreflex sensitivity in any group.
Conclusions:
- Oral glucose loading induces hypotension in the elderly, irrespective of baseline blood pressure.
- Baroreflex sensitivity is reduced in the elderly but unaffected by glucose loading.
- Other mechanisms, not related to baroreflex sensitivity, likely cause postprandial hypotension in older adults.