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Impact of phenolic-rich olive leaf extract on blood pressure, plasma lipids and inflammatory markers: a randomised controlled trial
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Impact of phenolic-rich olive leaf extract on blood pressure, plasma lipids and inflammatory markers: a randomised controlled trial
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Impact of phenolic-rich olive leaf extract on blood pressure, plasma lipids and inflammatory markers: a randomised controlled trial
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Journal Article
Impact of phenolic-rich olive leaf extract on blood pressure, plasma lipids and inflammatory markers: a randomised controlled trial
2017
Overview
Purpose
Dietary polyphenols have been demonstrated to favourably modify a number of cardiovascular risk markers such as blood pressure (BP), endothelial function and plasma lipids. We conducted a randomised, double-blind, controlled, crossover trial to investigate the effects of a phenolic-rich olive leaf extract (OLE) on BP and a number of associated vascular and metabolic measures.
Methods
A total of 60 pre-hypertensive [systolic blood pressure (SBP): 121–140 mmHg; diastolic blood pressure (DBP): 81–90 mmHg] males [mean age 45 (±SD 12.7 years, BMI 26.7 (±3.21) kg/m
2
] consumed either OLE (136 mg oleuropein; 6 mg hydroxytyrosol) or a polyphenol-free control daily for 6 weeks before switching to the alternate arm after a 4-week washout.
Results
Daytime [−3.95 (±SD 11.48) mmHg,
p
= 0.027] and 24-h SBP [−3.33 (±SD 10.81) mmHg,
p
= 0.045] and daytime and 24-h DBP [−3.00 (±SD 8.54) mmHg,
p
= 0.025; −2.42 (±SD 7.61) mmHg,
p
= 0.039] were all significantly lower following OLE intake, relative to the control. Reductions in plasma total cholesterol [−0.32 (±SD 0.70) mmol/L,
p
= 0.002], LDL cholesterol [−0.19 (±SD 0.56) mmol/L,
p
= 0.017] and triglycerides [−0.18 (±SD 0.48),
p
= 0.008] were also induced by OLE compared to control, whilst a reduction in interleukin-8 [−0.63 (±SD 1.13) pg/ml;
p
= 0.026] was also detected. Other markers of inflammation, vascular function and glucose metabolism were not affected.
Conclusion
Our data support previous research, suggesting that OLE intake engenders hypotensive and lipid-lowering effects in vivo.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
