Folate administration decreases oxidative status and blood pressure in postmenopausal women
| Autor: | Beniamino Palmieri, Angelo Cagnacci, Anjeza Xholli, Marianna Cannoletta, Federica Palma, Ilaria Piacenti |
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| Rok vydání: | 2014 |
| Předmět: |
Blood Glucose
medicine.medical_specialty Ambulatory blood pressure antioxidant Homocysteine oxidation medicine.medical_treatment Diastole Medicine (miscellaneous) Blood Pressure free radicals blood pressure lipid insulin resistance cardiovascular risk Placebo folate Body Mass Index chemistry.chemical_compound Insulin resistance Double-Blind Method Internal medicine medicine Humans Insulin Tetrahydrofolates Triglycerides Nutrition and Dietetics business.industry Body Weight Cholesterol HDL Cholesterol LDL Middle Aged medicine.disease Postmenopause Oxidative Stress Blood pressure Endocrinology chemistry Homeostatic model assessment folate blood pressure oxidation antioxidant Female Insulin Resistance business |
| Zdroj: | European journal of nutrition. 54(3) |
| ISSN: | 1436-6215 |
| Popis: | The purpose of this study was to evaluate whether folate exerts antioxidant effects in postmenopausal women and whether this effect is related to folate-induced modification of 24-h ambulatory blood pressure (BP). Double-blind placebo-controlled study performed in 30 apparently healthy postmenopausal women recruited at the outpatient service of University Hospital. Women, free from hormones or substances possibly interfering with the investigated parameters, were randomized to receive orally for 3 weeks placebo (n = 15) or 15 mg/day of 5-methyltetrahydrofolate (5-MTHF; n = 15). Whole-blood free oxygen radicals test (FORT), free oxygen radical defence (FORD), lipids, glucose, insulin, insulin resistance [homeostatic model assessment for insulin resistance (HOMA-IR)], homocysteine and 24-h ambulatory BP values were evaluated. In the entire group of women, FORT was independently and inversely related to the day–night difference of diastolic (r = 0.420; p = 0.03) and mean BP (r = 0.497; p = 0.01). Placebo did not affect any biochemical or BP parameter. 5-MTHF reduced FORT (−71.5 ± 98.2; p = 0.02) and increased FORD (0.5 ± 0.9; p = 0.05), decreased insulin (p = 0.01), HOMA-IR (p = 0.0002) and homocysteine (p = 0.008). During 5-MTHF, night-time mean (p = 0.001) and diastolic BP (p = 0.002) decreased of about 5 mmHg and the day–night difference of mean (p = 0.001) and diastolic BP (p = 0.002) contemporaneously increased. FORT reduction was related to the amplification of the nocturnal decline of mean (0.697; p = 0.006) and diastolic BP (r = 0.777; p = 0.002) and to the amplification of the day–night difference of diastolic BP (r = 0.63; p = 0.015). Present data show a clear reduction of oxidative stress during 5-MTHF administration and a strong correlation between this decrease and the nocturnal decline of BP. The possible link between the two is worthy to be explored. |
| Databáze: | OpenAIRE |
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