Effects of Pulse Varieties on Blood Vessel Function in Peripheral Artery Disease

NCT ID: NCT01382056

Last Updated: 2014-02-12

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

62 participants

Study Classification

INTERVENTIONAL

Study Start Date

2012-03-31

Study Completion Date

2013-12-31

Brief Summary

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Consumption of a diet containing pulse crops provides flavonoid compounds that will improve vascular function and glycemic control in individuals with Peripheral Artery Disease.

Detailed Description

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This is a single site, randomized, controlled, food intervention study designed to explore the effects of pulse types and varieties on blood vessel function in individuals with Peripheral Artery Disease.

Phase One(Acute): To identify relative potency of pulse types (beans,peas, lentils,and chickpeas) for vascular activity in healthy participants and participants with Peripheral Artery Disease. Healthy participants (10) and participants with Peripheral Artery Disease (10) will be asked to consume (in random order) one test food per in-person visit over 5 visits scheduled a minimum of 6 days apart. Vascular responsiveness will be monitored non-invasively by peripheral arterial tonometry before consumption of the test food and 2 hours post food consumption. Blood samples will be collected at the same time intervals for analyses, of vascular, inflammatory, and metabolic markers as well as flavonoids present in the pulses.

Phase Two(Chronic): Chronic 8-week study using mixed beans (pinto, kidney, black, and navy) to determine improvements in vascular function, cardiovascular risk factors, and glycemic control in participants with Peripheral Artery Disease (N=75, 25/group). Participants will be randomly assigned to one of the following three groups: i) foods containing 0.6 cup mixed beans/day consumed 5 days per week (total amount is 3 cups mixed beans per week); or, ii) foods containing 0.3 cup mixed beans/day for 5 days per week); or, iii) pulse-free foods (control) consumed 5 days/week. A total of 3 in-person visits for screening, baseline and final will be required during the 8-week study schedule. Assessments of vascular function, cognitive function, food dietary intake and preferences, flavonoid levels and cardiovascular risk markers in blood and urine, glycemic control, and anthropometrics will be completed at baseline and at 8 weeks.

Phase Three(Follow-Up: An 8-week follow-up assessment with a subset of participants (n=10/group, 3 groups) with Peripheral Artery Disease will be done at 2, 4, and at 8 weeks. Assessments of vascular function, cognitive function, food dietary intake, flavonoid levels and cardiovascular risk markers in blood and urine, glycemic control, and anthropometrics will be completed. These assessments will enable us to determine the length of time the benefits of the pulse consumption are retained.

Conditions

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Peripheral Artery Disease

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

SINGLE_GROUP

Blinding Strategy

NONE

Study Groups

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Mixed beans (higher amount)

Participants may be randomized to foods containing 0.6 cup of mixed beans daily 5 times per week for 8 weeks

Group Type EXPERIMENTAL

Mixed bean (higher amount)

Intervention Type OTHER

0.6 cup of mixed beans consumed 5 days per week for 8 weeks

Mixed beans (lower aomunt)

Participants may be randomized to foods containing 0.3 cup of mixed beans daily, 5 times per week for 8 weeks.

Group Type EXPERIMENTAL

Mixed beans (lower amount)

Intervention Type OTHER

0.3 cup of mixed beans consumed daily, 5 days per week for 5 weeks

Control foods

pulse-free control foods consumed daily, 5 days per week for 8 weeks

Group Type ACTIVE_COMPARATOR

control foods

Intervention Type OTHER

pulse-free control foods consumed daily, 5 days per week for 8 weeks

Interventions

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control foods

pulse-free control foods consumed daily, 5 days per week for 8 weeks

Intervention Type OTHER

Mixed bean (higher amount)

0.6 cup of mixed beans consumed 5 days per week for 8 weeks

Intervention Type OTHER

Mixed beans (lower amount)

0.3 cup of mixed beans consumed daily, 5 days per week for 5 weeks

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

Healthy Participants, Acute Phase:

* Healthy volunteers, male or female, \>33 years of age, age matched with PAD participants ± 7 years;
* BMI 18-30;
* Glycated hemoglobin \< 6.5%;
* Fasting serum total cholesterol \< 4 mmol/L and triglycerides \< 2.5 mmol/L;
* Blood pressure \< 140/90 mm Hg;
* Ankle-brachial Index (ABI) \>0.9;
* Willing to comply with the protocol requirements;
* Willing to provide informed consent.


* Male or female, \> 40 years of age;
* Documented Peripheral Artery Disease including those with claudication as defined by an ankle brachial Index of ≤ 0.90; or asymptomatic carotid stenosis of \> 50% or confirmed by imaging; or having had a previous intervention for Peripheral Artery Disease or carotid disease;
* Stable medication profile with no changes required for the past 3 months;
* Willing to comply with the protocol requirements;
* Willing to provide informed consent.

Exclusion Criteria

Healthy Participants, Acute Phase:

* Currently smoking, or smoking within the last 6 months;
* Clinically diagnosed disease affecting the heart, liver, kidneys, lungs, gastrointestinal, endocrine or blood/immune systems that requires medical treatment;
* Taking any prescribed medication with the exception of birth control and hormone (estrogen) replacement therapy;
* Pregnancy;
* Amputation of upper or lower extremity on both sides;
* History of severe gastrointestinal reactions or allergies to pulses or ingredients used to prepare the pulse-containing and pulse-free foods.


* Currently smoking, or smoking within the last 6 months;
* Type 1 diabetes;
* Renal failure requiring dialysis;
* Acute cardiovascular event or medical illness within the past 3 months precluding study participation;
* Hormone (estrogen) replacement therapy;
* Amputation of upper or lower extremity on both sides;
* History of severe gastrointestinal reactions or allergies to pulses or ingredients used to prepare the pulse-containing and pulse-free foods;
* Currently participating in or having participated in a food study within the last 3 months unless randomized to a control group and consumed no study foods;
* High pulse consumption (greater or equal to 2 servings per week);
* Inability to adhere to a regular diet;
* Additional intake of pulses other than the requirements outlined in the study.
Minimum Eligible Age

34 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes

Sponsors

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Pulse Canada

OTHER

Sponsor Role collaborator

University of Manitoba

OTHER

Sponsor Role lead

Responsible Party

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Dr. Peter Zahradka

Professor, Department of Physiology

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Peter C Zahradka, PhD

Role: PRINCIPAL_INVESTIGATOR

University of Manitoba

Locations

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I.H Asper Clinical Research Institute

Winnipeg, Manitoba, Canada

Site Status

Countries

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Canada

References

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Wang L, Goldberg EM, Taylor CG, Zahradka P, Aliani M. Analyses of serum and urinary metabolites in individuals with peripheral artery disease (PAD) consuming a bean-rich diet: relationships with drug metabolites. Appl Physiol Nutr Metab. 2022 Mar;47(3):243-252. doi: 10.1139/apnm-2021-0495. Epub 2021 Oct 26.

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Related Links

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http://www.ccarm.ca

Website for Canadian Centre for Agri-food Research in Health and Medicine

Other Identifiers

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B2011:026

Identifier Type: -

Identifier Source: org_study_id

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