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Antihypertensive and antioxidant effects of dietary black sesame meal in pre-hypertensive humans

Jatuporn Wichitsranoi1, Natthida Weerapreeyakul2, Patcharee Boonsiri3, Chatri Settasatian4, Nongnuch Settasatian5, Nantarat Komanasin6, Suchart Sirijaichingkul7, Yaovalak Teerajetgul5, Nuchanart Rangkadilok8 and Naruemon Leelayuwat9*

Author Affiliations

1 Faculty of Physical Therapy, Mahidol University, Nakhon Pathom 73170, Thailand

2 Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand

3 Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand

4 Department of Pathology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand

5 Department of Clinical Chemistry, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand

6 Department of Clinical Microscopy, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand

7 Department of Clinical Immunology, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand

8 Laboratory of Pharmacology, Chulabhorn Research Institute (CRI), Vibhavadee-Rangsit Highway, Laksi, Bangkok 10210, Thailand

9 Department of Physiology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand

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Nutrition Journal 2011, 10:82  doi:10.1186/1475-2891-10-82

Published: 9 August 2011

Abstract

Background

It has been known that hypertension is an independent risk factor for cardiovascular disease (CVD). CVD is the major cause of morbidity and mortality in developed and developing countries. Elevation of blood pressure (BP) increases the adverse effect for cardiovascular outcomes. Prevention of increased BP plays a crucial role in a reduction of those outcomes, leading to a decrease in mortality. Therefore, the purpose of this study was to investigate the effects of dietary black sesame meal on BP and oxidative stress in individuals with prehypertension.

Methods

Twenty-two women and eight men (aged 49.8 ± 6.6 years) with prehypertension were randomly divided into two groups, 15 subjects per group. They ingested 2.52 g black sesame meal capsules or placebo capsules each day for 4 weeks. Blood samples were obtained after overnight fasting for measurement of plasma lipid, malondialdehyde (MDA) and vitamin E levels. Anthropometry, body composition and BP were measured before and after 4-week administration of black sesame meal or a placebo.

Results

The results showed that 4-week administration of black sesame meal significantly decreased systolic BP (129.3 ± 6.8 vs. 121.0 ± 9.0 mmHg, P < 0.05) and MDA level (1.8 ± 0.6 vs. 1.2 ± 0.6 μmol/L, P < 0.05), and increased vitamin E level (29.4 ± 6.0 vs. 38.2 ± 7.8 μmol/L, P < 0.01). In the black sesame meal group, the change in SBP tended to be positively related to the change in MDA (R = 0.50, P = 0.05), while the change in DBP was negatively related to the change in vitamin E (R = -0.55, P < 0.05). There were no correlations between changes in BP and oxidative stress in the control group.

Conclusions

These results suggest the possible antihypertensive effects of black sesame meal on improving antioxidant status and decreasing oxidant stress. These data may imply a beneficial effect of black sesame meal on prevention of CVD.

Keywords:
blood pressure; oxidative stress; malondialdehyde; sesamin; sesamolin; tocopherol