Endothelial DysfunctionNCT02961972
Effects of Oral Supplementation With Creatine on Systemic Microvascular Endothelial Function in Vegetarian Individuals
A study testing monohydrate and micronized creatine in people with Endothelial Dysfunction and Hyperhomocysteinemia, run by National Institute of Cardiology, Laranjeiras, Brazil at 1 site in Brazil.
Trial summary
The present study aims at investigating the effects of the oral supplementation with creatine on the systemic microvascular reactivity and plasma levels of homocysteine in vegetarian individuals of the vegan type. Read more about this study
- Who is it for?
- Ages 18 to 40 yearsHealthy volunteers can take part
- Conditions the study is for
- Endothelial Dysfunction, Hyperhomocysteinemia
- What is being tested?
- monohydrate and micronized creatine
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 49 participants
- Where
- 1 siteBrazil
- Study dates
- Jan 2015to Jun 2017
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 40 years
- All sexes
- Healthy volunteers accepted
- Adult
Who may be able to join
- healthy vegetarians of the vegan type
Who cannot join
- previous treatment with dietary supplements
- high intensity physical activity
Trial locations and contacts
1 site in 1 country.
Brazil1 site
National Institute of Cardiology, Ministry of Health, Brazil
Rio de Janeiro, 22240-006
About this study
Official title: Effects of Oral Supplementation With Creatine on Plasma Homocysteine Levels and Systemic Microvascular Endothelial Function in Vegetarian Individuals
The present study aims at investigating the effects of the oral supplementation with creatine on the systemic microvascular reactivity and plasma levels of homocysteine in vegetarian individuals of the vegan type.
Read the detailed description
A vegetarian is an individual who lives on a diet of grains, pulses, legumes, nuts, seeds, vegetables, fruits, fungi, algae, yeast and/or some other non-animal-based foods, with or without, dairy products, honey and/or eggs. A vegetarian does not eat foods that consist of, or have been produced with the aid of products consisting of or created from, any part of the body of a living or dead animal. This includes meat, poultry, fish, shellfish, insects, by-products of slaughter** or any food made with processing aids created from these.
There are different types of vegetarian: i) Lacto-ovo-vegetarians eat both dairy products and eggs; this is the most common type of vegetarian diet; ii) Lacto-vegetarians eat dairy products but avoid eggs; iii) Ovo-vegetarians eat eggs but not dairy products; iv) Vegans do not eat dairy products, eggs, or any other products which are derived from animals.
Vegetarian individuals are considered to have lower cardiovascular risk for the development of cardiovascular diseases and lower cardiovascular mortality, when compared to omnivore individuals.
Nevertheless, some vegetarian diets may result in the deficiency of micronutrients and induce deficiency in some compounds such as vitamins, amino-acids, iron, zinc, calcium, omega-3 fatty acids and so on.
Moreover, vegetarian individuals can present deficiency in amino-acids such as carnosine and creatine, present essentially in the skeletal muscle of animals. In this context, deficiency in creatine has been considered as a risk factor for hyperhomocysteinemia and the consequent dysfunction of the vascular endothelium.
Hyperhomocysteinemia also is known to be an independent risk factor for cardiovascular diseases similar to hypertension, smoke and dyslipidemia.
In the present study, we investigate the effects of creatine supplementation in the systemic microvascular endothelial function and density in vegan-vegetarians presenting with normo- or hyperhomocysteinemia using laser-based skin flowmetry and video-capillaroscopy. We also investigate the effects of creatine supplementation on lipid and glycemic profile and plasma homocysteine levels.
Microvascular reactivity is evaluated using a laser speckle contrast imaging system in combination with the iontophoresis of acetylcholine (ACh), for the noninvasive and continuous measurement of cutaneous microvascular perfusion changes.
Microvascular density in the skin is evaluated using intravital video-microscopy.
- Conditions
- Endothelial Dysfunction, Hyperhomocysteinemia
- Being tested
- monohydrate and micronized creatine, placebo
- Keywords
- vegetarianism, Hyperhomocysteinemia, vegan vegetarian
- Medical subject headings
- Hyperhomocysteinemia
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
monohydrate and micronized creatineDietary supplement
oral supplementation with creatine
placeboOther
oral supplementation with maltodextrin (control group)
| Study group | Role | What they receive |
|---|---|---|
| control group | Placebo comparator | Oral ingestion of placebo pills (maltodextrin) during three weeks Receives: Other: placebo |
| creatine supplementation | Experimental | Oral supplementation with 5 g of monohydrate and micronized creatine during three weeks Receives: Dietary Supplement: monohydrate and micronized creatine |
What is being measured
The primary outcome is the main question the study is designed to answer.
Reactivity of the systemic microcirculation
Assessment of the endothelial-dependent microvascular reactivity in the skin using laser speckle contrast imaging
Measured: three-week treatment
Secondary outcomes (2)
cutaneous microvascular density
Assessment of skin microvascular density using video-capillaroscopy
Measured: three-week treatment
Homocysteine levels in the plasma
Measured: three-week treatment
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted11 Nov 2016 (estimated)
- Study startJan 2015
- Primary completionJun 2017
- Study completionJun 2017
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Endothelial DysfunctionStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- creatine or placebo supplementation
- Masking
- Single blind
- Who is masked
- Participant
- Enrolment
- 49 participants (actual)
Sponsor and investigators
- Lead sponsor
- National Institute of Cardiology, Laranjeiras, Brazil
- Sponsor type
- Other government
- Responsible party
- Principal investigator, Eduardo Tibirica, National Institute of Cardiology, Laranjeiras, Brazil
- Investigators
- Eduardo Tibirica, MD, PhD, Principal investigator, National Institute of Cardiology
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02961972
- Sponsor's protocol ID
- CAAE: 302471512.4.0000.5272
- Status last verified
- Jul 2017
- First submitted
- 7 Nov 2016
- Last updated
- 31 Jul 2017
- Results posted
- No
- Data monitoring committee
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 31 Jul 2017. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effects of Oral Supplementation With Creatine on Plasma Homocysteine Levels and Systemic Microvascular Endothelial Function in Vegetarian Individuals
- ClinicalTrials.gov ID
- NCT02961972
- Acronym / sponsor ID
- CAAE: 302471512.4.0000.5272
- Conditions
- Endothelial Dysfunction, Hyperhomocysteinemia
- Keywords
- vegetarianism, Hyperhomocysteinemia, vegan vegetarian
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 49 participants (actual)
- Lead sponsor
- National Institute of Cardiology, Laranjeiras, BrazilOther government
- Study start
- Jan 2015
- Primary completion
- Jun 2017 (actual)
- Study completion
- Jun 2017 (actual)
- First posted
- 11 Nov 2016 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The present study aims at investigating the effects of the oral supplementation with creatine on the systemic microvascular reactivity and plasma levels of homocysteine in vegetarian individuals of the vegan type.
Detailed description
A vegetarian is an individual who lives on a diet of grains, pulses, legumes, nuts, seeds, vegetables, fruits, fungi, algae, yeast and/or some other non-animal-based foods, with or without, dairy products, honey and/or eggs. A vegetarian does not eat foods that consist of, or have been produced with the aid of products consisting of or created from, any part of the body of a living or dead animal. This includes meat, poultry, fish, shellfish, insects, by-products of slaughter** or any food made with processing aids created from these.
There are different types of vegetarian: i) Lacto-ovo-vegetarians eat both dairy products and eggs; this is the most common type of vegetarian diet; ii) Lacto-vegetarians eat dairy products but avoid eggs; iii) Ovo-vegetarians eat eggs but not dairy products; iv) Vegans do not eat dairy products, eggs, or any other products which are derived from animals.
Vegetarian individuals are considered to have lower cardiovascular risk for the development of cardiovascular diseases and lower cardiovascular mortality, when compared to omnivore individuals.
Nevertheless, some vegetarian diets may result in the deficiency of micronutrients and induce deficiency in some compounds such as vitamins, amino-acids, iron, zinc, calcium, omega-3 fatty acids and so on.
Moreover, vegetarian individuals can present deficiency in amino-acids such as carnosine and creatine, present essentially in the skeletal muscle of animals. In this context, deficiency in creatine has been considered as a risk factor for hyperhomocysteinemia and the consequent dysfunction of the vascular endothelium.
Hyperhomocysteinemia also is known to be an independent risk factor for cardiovascular diseases similar to hypertension, smoke and dyslipidemia.
In the present study, we investigate the effects of creatine supplementation in the systemic microvascular endothelial function and density in vegan-vegetarians presenting with normo- or hyperhomocysteinemia using laser-based skin flowmetry and video-capillaroscopy. We also investigate the effects of creatine supplementation on lipid and glycemic profile and plasma homocysteine levels.
Microvascular reactivity is evaluated using a laser speckle contrast imaging system in combination with the iontophoresis of acetylcholine (ACh), for the noninvasive and continuous measurement of cutaneous microvascular perfusion changes.
Microvascular density in the skin is evaluated using intravital video-microscopy.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (participant)
- Number of arms
- 2
- Model description
- creatine or placebo supplementation
| Arm | Type | Receives |
|---|---|---|
| control group | Placebo comparator | Other: placeboOral ingestion of placebo pills (maltodextrin) during three weeks |
| creatine supplementation | Experimental | Dietary Supplement: monohydrate and micronized creatineOral supplementation with 5 g of monohydrate and micronized creatine during three weeks |
Who may qualify
- Ages
- 18 to 40 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (1 listed)
- healthy vegetarians of the vegan type
Key exclusion criteria (2 listed)
- previous treatment with dietary supplements
- high intensity physical activity
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| monohydrate and micronized creatineoral supplementation with creatine | Dietary supplement | creatine supplementation |
| placebooral supplementation with maltodextrin (control group) | Other | control group |
Primary outcome
Reactivity of the systemic microcirculation
Time frame: three-week treatment
Assessment of the endothelial-dependent microvascular reactivity in the skin using laser speckle contrast imaging
2 secondary outcomes
cutaneous microvascular density
Time frame: three-week treatment
Homocysteine levels in the plasma
Time frame: three-week treatment
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 31 Jul 2017.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Eduardo Tibirica, MD, PhD principal investigator
National Institute of Cardiology
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing monohydrate and micronized creatine in people with Endothelial Dysfunction and Hyperhomocysteinemia, run by National Institute of Cardiology, Laranjeiras, Brazil at 1 site in Brazil.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 31 Jul 2017. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Brazil. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Reactivity of the systemic microcirculation (time frame: three-week treatment). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 31 Jul 2017; AzTrials last refreshed its copy on 7 Nov 2026.