Haemodynamic response to an isometric exercise test in obese patients: Influence of autonomic dysfunction
| Autor: | P. Cazes, Jacques Pariès, PT Bich Ngoc, S. Idriss, Paul Valensi, JR Attali, B Lormeau |
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| Rok vydání: | 1999 |
| Předmět: |
Adult
Male medicine.medical_specialty Adolescent Haemodynamic response Endocrinology Diabetes and Metabolism Medicine (miscellaneous) Hemodynamics Blood Pressure Isometric exercise Autonomic disorder Autonomic Nervous System Heart Rate Internal medicine Heart rate medicine Humans Insulin Obesity Vagal tone Exercise Nutrition and Dietetics business.industry Middle Aged Autonomic nervous system Endocrinology Blood pressure Exercise Test Female business |
| Zdroj: | International Journal of Obesity. 23:543-549 |
| ISSN: | 1476-5497 0307-0565 |
| DOI: | 10.1038/sj.ijo.0800873 |
| Popis: | OBJECTIVE: To investigate blood pressure (BP) and heart rate (HR) responses to an isometric exercise test in obese non diabetic patients and to correlate the results with vagal function and plasma insulin concentration. SUBJECTS: 63 obese patients, 36 of whom had abnormal cardiac parasympathetic control (PS+), and 35 healthy control subjects. METHODS: Analysis of HR variations during three standardized tests: deep-breathing, lying-to-standing and Valsalva. Isometric contraction (handgrip) for 5 min. RESULTS: In the PS+ obese patients, resting HR and body mass index (BMI) were significantly higher than in the PS− subjects and there was a trend to higher plasma insulin concentrations. Age-matched comparison showed that during the handgrip test, the increase in HR at the first minute was significantly higher in the PS− obese patients than in the controls. The increase in BP was significantly lower in the PS+ obese patients than in age-and-BMI-matched PS− obese patients. CONCLUSION: These data suggest that 1) there is an increase in cardiac vagal tone in PS− obese patients, since the early increase in HR at 1 min of the handgrip test, results from the withdrawal of vagal tone; 2) BP response to an isometric contraction is impaired in PS+ obese patients due to a lower sympathetic activation; 3) high plasma insulin concentrations may also contribute to limiting the BP response; and 4) autonomic disorders may account for alterations in the haemodynamic changes during exercise. |
| Databáze: | OpenAIRE |
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