- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03871777
Dietary Nitrate Intake in Vegetarians and Omnivores (NO3)
Dietary Intake of Inorganic Nitrate in Vegetarians and Omnivores and Its Impact on Blood Pressure, Resting Metabolic Rate and the Oral Microbiome
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Devon
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Plymouth, Devon, United Kingdom, PL4 8AA
- Laboratory of Nutrition, Exercise & Health
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Healthy vegetarians (vegans and ovo-lacto vegetarians) following this dietary pattern for at least a year.
- Health omnivores
Exclusion Criteria:
- Smokers
- Individuals taking any medications or recreational drugs.
- Individuals with pre-existing medical conditions such as hypertension, diabetes, dyslipidaemia or dental conditions (gingivitis).
- Individuals using mouthwash or tongue scrapes were excluded from this study
Study Plan
How is the study designed?
Design Details
- Primary Purpose: BASIC_SCIENCE
- Allocation: NON_RANDOMIZED
- Interventional Model: CROSSOVER
- Masking: SINGLE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
ACTIVE_COMPARATOR: Vegetarians
Healthy vegetarians (vegans and lacto-ovo vegetarians) 18 and 50 years formed this arm.
|
Participants received placebo mouthwash (ultrapure unflavoured water) with which they rinsed their mouth for one minute, twice a day for 7 days.
Resting metabolic rate and blood pressure were measured on day eight.
Additionally, blood and saliva samples were taken from all the participants.
Dietary records of seven days were also collected in order to confirm the foods and portion sizes consumed, preparation methods, recipes and any brand names.
After using placebo and complete all the physiological measurements, participants were given a further one-week supply of antibacterial mouthwash containing 0.2% chlorhexidine (Corsodyl, GlaxoSmithKline, UK), encouraged to rinse their mouth for one minute, twice a day for 7 more days.
They returned to the laboratory in 7 days to repeat all measurements in the same order.
|
SHAM_COMPARATOR: Omnivores
Healthy omnivores with similar characteristics of vegetarians (age, body mass index, gender and physical activity levels) formed this arm
|
Participants received placebo mouthwash (ultrapure unflavoured water) with which they rinsed their mouth for one minute, twice a day for 7 days.
Resting metabolic rate and blood pressure were measured on day eight.
Additionally, blood and saliva samples were taken from all the participants.
Dietary records of seven days were also collected in order to confirm the foods and portion sizes consumed, preparation methods, recipes and any brand names.
After using placebo and complete all the physiological measurements, participants were given a further one-week supply of antibacterial mouthwash containing 0.2% chlorhexidine (Corsodyl, GlaxoSmithKline, UK), encouraged to rinse their mouth for one minute, twice a day for 7 more days.
They returned to the laboratory in 7 days to repeat all measurements in the same order.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Dietary nitrate intake
Time Frame: 7 days
|
Macro- and micronutrient intake of seven-day food diaries were analysed using a nutritional analysis software programme (Microdiet, Downlee Systems, Chapel-en-le-Frith, UK).
Nitrate content of vegetables was mainly obtained from the European Food Safety Authority and additional data for spinach and lettuce from the Food Standards Agency.
Nitrate and total polyphenol figures were uploaded to the Microdiet database prior to analysis.
|
7 days
|
Concentration of nitrate and nitrite in plasma and saliva
Time Frame: 7 days
|
Whole blood was collected into lithium-heparin tubes (BD Vacutainer®, Becton Dickinson, Plymouth, UK) and rapidly centrifuged at 4,000 rpm and 4°C for 10 minutes.
The plasma was then separated, frozen at -80°C until further analyses of nitrate and nitrite were performed.
Non-stimulated saliva (3 milliliters) was also collected into a sterile falcon tube and rapidly frozen at -80°C.
Then, nitrate and nitrite were measured in plasma and saliva using ozone-based chemiluminescence.
|
7 days
|
Change in blood pressure
Time Frame: 7 days
|
Systolic, diastolic and mean arterial blood pressure was measured following British Hypertension Guidelines.
Three successive supine readings were taken using an oscillometric device (Connex ProBP 3400 Digital Blood Pressure Device, Welch Allyn UK Ltd.) with a one minute rest between readings.
The second and third readings were averaged to determine mean clinic blood pressure.
|
7 days
|
Change in oral nitrate-reducing capacity
Time Frame: 7 days
|
Nitrate-reducing capacity of oral bacteria was analysed to compare vegetarians and omnivores and treatments (placebo mouthwash vs antibacterial mouthwash).
Participants were instructed to hold 10 milliliters of water containing sodium nitrate (80 μicromols) in their mouth for 5 minutes.
The mouth rinse was collected into a Falcon sterile tube and centrifuged (4,500 rpm, 4°C) for 10 minutes.
The supernatant was collected and stored at -80°C before measuring absolute nitrite concentration.
|
7 days
|
Change in Resting Energy Expenditure
Time Frame: 7 days
|
Resting Energy Expenditure was analysed using indirect calorimetry after using the placebo mouthwash and antibacterial mouthwash
|
7 days
|
Change oral microbiome
Time Frame: 7 days
|
bundance of oral bacteria was analysed using 16S ribosomal ribonucleic acid (rRNA) after using the placebo mouthwash and antibacterial mouthwash. Salivary DNA was extracted using a DNA kit (QIAamp® DNeasy Blood & Tissue Kit). Polymerase chain reaction (PCR) amplification of the 16S rRNA V1-2 region was carried out using universal 16S primers 27 F (5'-AGA GTT TGA TCM TGG CTC AG-3') and 338 R (5'-GCW GCC WCC CGT AGG WGT-3'). Single band PCR products were purified and quantified with Qubit 2.0 Fluorometer (Invitrogen, CA, USA). Sequencing was performed on an Ion Torrent Personal Genome Machine. |
7 days
|
Change in blood biomarkers
Time Frame: 7 days
|
Blood markers were analyzed to assess differences between vegetarians and omnivores to control for diabetes and dyslipidaemia and to analyse the effect of antibacterial mouthwash. Whole blood glucose and lactate was measured using a biochemistry analyser (YSI 2300 Stat Plus, YSI Life Sciences, USA). Total cholesterol, triglycerides, high density lipoproteins (HDL) and low density lipoproteins (LDL) were analysed with enzymatic methods using the Roche 702 spectrophotometric module of a Cobas 8000 analyser (Roche Diagnostics Ltd, UK) |
7 days
|
Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Study Director: Raul Bescos, PhD, University of Plymouth
Study record dates
Study Major Dates
Study Start (ACTUAL)
Primary Completion (ACTUAL)
Study Completion (ACTUAL)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (ACTUAL)
Study Record Updates
Last Update Posted (ACTUAL)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 15/16-469
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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