The effect of phenolic content of olive oil on ischaemic reactive hyperaemia in pre-hypertensive subjects
| ISRCTN | ISRCTN03450153 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN03450153 |
| Protocol serial number | N/A |
| Sponsor | Rovira i Virgili University (Spain) |
| Funder | Spanish Ministry of Education and Science (Spain) (ref: AGL2005-07881-C02-01/ALI) |
- Submission date
- 18/01/2010
- Registration date
- 02/02/2010
- Last edited
- 26/08/2014
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Circulatory System
Plain English summary of protocol
Not provided at time of registration
Contact information
Scientific
C/ Sant Llorenç, 21
Reus
43201
Spain
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Randomised double-blind crossover controlled trial |
| Secondary study design | Randomised controlled trial |
| Study type | Participant information sheet |
| Scientific title | Effects of virgin olive oil enriched with phenolic compounds on blood pressure and endothelial function: a randomised double-blind crossover controlled trial |
| Study acronym | OLIPA study |
| Study objectives | Increased antioxidant capacity exerted by phenolic compounds improved endothelial function leading to reduced blood pressure in postprandial state. |
| Ethics approval(s) | Local medical ethics committee (Comité d'Ètica d'Investigació Clínica Hospital Universitari Sant Joan, Reus) approved, 24/04/2008, ref: 08-04-24/4proj5 |
| Health condition(s) or problem(s) studied | Ischaemic reactive hyperaemia/blood pressure |
| Intervention | All participants will follow a stabilisation period of 1 week with a low saturated fat diet. The day before to the postprandial test was followed by a polyphenol-free diet. Participants will be randomised individually between two postprandial tests: 1. Virgin olive oil. This will have a polyphenol content of 332.63 mg/kg (or 332.63 ppm measured by HPLC-DAD), an amount similar to oils in the area. 2. Virgin olive oil enriched with polyphenols. This will be enriched with polyphenols from defatted olive paste, which increase the concentrations up to three times, reaching a total content of 1008.14 mg/kg (or 1008.14 ppm measured by HPLC-DAD). These oils are prepared by the research group from Universitat de Lleida. Participants will be provided with 80 g of bread containing 30 ml of the oil they have been allocated to. For 300 minutes after ingestion, participants will rest and may only drink water. One week later, participants will take the other investigational product in the same manner as before. Diet monitoring will be conducted through a 3-day dietary record, in weeks 1 and 2. Participants are advised to maintain their usual physical activity and are monitored by a physical activity questionnaire. |
| Intervention type | Drug |
| Phase | Not Applicable |
| Drug / device / biological / vaccine name(s) | Virgin olive oil enriched with phenolic compounds |
| Primary outcome measure(s) |
1. Blood pressure, measured at baseline and 120, 240 and 300 minutes on each study day |
| Key secondary outcome measure(s) |
Difference between the two oils (from baseline to 120, 240 and 300 minutes) of the following parameters: |
| Completion date | 31/03/2010 |
Eligibility
| Participant type(s) | Healthy volunteer |
|---|---|
| Age group | Adult |
| Lower age limit | 18 Years |
| Sex | All |
| Target sample size at registration | 30 |
| Key inclusion criteria | 1. Healthy volunteers aged 18 to 75 years, either sex 2. Systolic blood pressure levels upper or equal 120 to 159 mmHg and/or diastolic blood pressure upper or equal 80 to 99 mmHg without antihypertensive treatment |
| Key exclusion criteria | 1. Low density lipoprotein cholesterol (LDL-c) levels upper 189 mg/dL 2. Triglycerides upper 350 mg/dL (the threshold level to determine LDL-c by the Friedewald formula) 3. Chronic alcoholism 4. Body mass index (BMI) upper 30 kg/m^2 5. Statin treatment prior to initiating the trial and would not have left at least 2 months before starting the study 6. Antihypertensive treatment prior to initiating the trial and would not have left at least 2 months before starting the study 7. Having diabetes mellitus (if you develop a blood glucose, fasting, upper 126 mg/dL, should be repeated and confirmed) 8. Renal disease (plasma creatinine levels upper 1.4 mg/dL for women and upper 1.5 mg/dL for men 9. Having acute infectious diseases, malignancies, severe liver insufficiency, chronic respiratory insufficiency or associated endocrine diseases 10. Other conditions such as special nutritional requirements or medications that may affect lipid metabolism or blood pressure 11. Participate or participating in a clinical trial in the last 3 months 12. Incapacity to continue in the study 13. History of gastrointestinal disease that can impair the absorption of nutrients 14. Suicide attempt |
| Date of first enrolment | 28/01/2009 |
| Date of final enrolment | 31/03/2010 |
Locations
Countries of recruitment
- Spain
Study participating centre
43201
Spain
Results and Publications
| Individual participant data (IPD) Intention to share | No |
|---|---|
| IPD sharing plan summary | Not provided at time of registration |
| IPD sharing plan |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Results article | results | 15/01/2015 | Yes | No | |
| Participant information sheet | Participant information sheet | 11/11/2025 | 11/11/2025 | No | Yes |
