Predictors of orthostatic intolerance in healthy young women
نویسندگان
چکیده
منابع مشابه
Predictors of orthostatic intolerance in healthy young women.
PURPOSE Orthostatic intolerance is more prevalent in women. The purpose of this investigation was to evaluate the physiological responses of orthostatic tolerant and intolerant females to progressive lower body negative pressure (LBNP) and to identify predictors of orthostatic tolerance. METHODS Following baseline measurements, eleven healthy, moderately active women (mean age 24 ± 3 yr) unde...
متن کاملSyndromes of orthostatic intolerance and syncope in young adults
OBJECTIVE To explore the clinical and neuroendocrine characteristics of syndromes of orthostatic intolerance and syncope in young adults. METHODS Two hundred and thirty-six patients aged 18-40 years with orthostatic intolerance and/or syncope were examined by head-up tilt test (HUT). Plasma levels of epinephrine, norepinephrine, renin, C-terminal-pro-arginine-vasopressin (CT-proAVP), C-termin...
متن کاملHemodynamic and neuroendocrine predictors of lower body negative pressure (LBNP) intolerance in healthy young men.
Exposure to LBNP results in body fluid shift to lower extremities similarly as under influence of orthostatic stress. In susceptible persons it leads to syncope. For better understanding why certain individuals are more susceptible to orthostatic challenges it seemed necessary to collect more data on hemodynamic and neuroendocrine adjustments occurring before onset of presyncopal symptoms Accor...
متن کاملEffects of oral contraceptives on sympathetic nerve activity during orthostatic stress in young, healthy women.
Recent studies report that the menstrual cycle alters sympathetic neural responses to orthostatic stress in young, eumenorrheic women. The purpose of the present study was to determine whether oral contraceptives (OC) influence sympathetic neural activation during an orthostatic challenge. Based on evidence that sympathetic baroreflex sensitivity (BRS) is increased during the "low hormone" (LH)...
متن کاملCommon syndromes of orthostatic intolerance.
The autonomic nervous system, adequate blood volume, and intact skeletal and respiratory muscle pumps are essential components for rapid cardiovascular adjustments to upright posture (orthostasis). Patients lacking sufficient blood volume or having defective sympathetic adrenergic vasoconstriction develop orthostatic hypotension (OH), prohibiting effective upright activities. OH is one form of ...
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ژورنال
عنوان ژورنال: Clinical & Investigative Medicine
سال: 2012
ISSN: 1488-2353
DOI: 10.25011/cim.v35i2.16290