Effects of Pulse Varieties on Blood Vessel Function in Peripheral Artery Disease (PULV-2011)

This study has been completed.
Sponsor:
Collaborator:
Pulse Canada
Information provided by (Responsible Party):
Dr. Peter Zahradka, University of Manitoba
ClinicalTrials.gov Identifier:
NCT01382056
First received: June 22, 2011
Last updated: February 11, 2014
Last verified: February 2014
  Purpose

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


Condition Intervention
Peripheral Artery Disease
Other: control foods
Other: Mixed bean (higher amount)
Other: Mixed beans (lower amount)

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Official Title: Effects of Pulse Varieties on Blood Vessel Function in Individuals With Peripheral Artery Disease (PAD)

Resource links provided by NLM:


Further study details as provided by University of Manitoba:

Primary Outcome Measures:
  • Evaluate individual pulse types and varieties in healthy participants and participants with Peripheral Artery Disease. [ Time Frame: 5-week schedule ] [ Designated as safety issue: No ]
    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.


Secondary Outcome Measures:
  • Evaluate the effects of mixed beans to determine improvements in vascular function [ Time Frame: 16 weeks ] [ Designated as safety issue: No ]
    Ankle brachial index, blood vessel function and claudication onset/walking distance will be measured and compared at the pre/post consumption time points (time 0, Week 8) in participants receiving food items with the most potent pulse variety or the control food items, and in follow-up during the post consumption follow-up phase at Weeks 2,4, and 8. Results of blood samples will be assessed and compared at the same time points for lipids, glucose, insulin, glycated hemoglobin and select markers of vascular function.

  • Analysis of dietary patterns and nutritional intake, compliance and tolerability before and after consumption of an 8-week diet of mixed beans [ Time Frame: 8 weeks ] [ Designated as safety issue: No ]
    Dietary patterns and nutritional intake will be assessed at baseline and at Week 8. Participants will undergo an interview to assess compliance and tolerability at various time points (weeks 2, 5, and 8) throughout the 8-week feeding schedule.

  • Evaluate the effects of mixed beans on cognitive function [ Time Frame: 16 weeks ] [ Designated as safety issue: No ]
    Data from the cognitive assessments collected at time 0 and Week 8 of the feeding schedule, and in follow-up post consumption at Weeks 2, 4, and 8, will be analyzed according to the statistical guide and recommendations provided with these tests. The cognitive tests that will be administered are: Mini Mental State Examination, Hopkins Verbal Learning, Digit Symbol Similarities Test, and Digit Span.


Enrollment: 62
Study Start Date: March 2012
Study Completion Date: December 2013
Primary Completion Date: December 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 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
Other: Mixed bean (higher amount)
0.6 cup of mixed beans consumed 5 days per week for 8 weeks
Experimental: 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.
Other: Mixed beans (lower amount)
0.3 cup of mixed beans consumed daily, 5 days per week for 5 weeks
Active Comparator: Control foods
pulse-free control foods consumed daily, 5 days per week for 8 weeks
Other: control foods
pulse-free control foods consumed daily, 5 days per week for 8 weeks

Detailed Description:

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.

  Eligibility

Ages Eligible for Study:   34 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Criteria

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.

Inclusion Criteria, Participants with Peripheral Artery Disease (Acute Phase and Chronic Phase):

  • 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.

Exclusion Criteria, Participants with Peripheral Artery Disease (Acute Phase and Chronic Phase):

  • 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.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01382056

Locations
Canada, Manitoba
I.H Asper Clinical Research Institute
Winnipeg, Manitoba, Canada, R2H 2A6
Sponsors and Collaborators
University of Manitoba
Pulse Canada
Investigators
Principal Investigator: Peter C Zahradka, PhD University of Manitoba
  More Information

Additional Information:
Publications:
Zahradka, P., Guzman, R., Weighell, W., Wright, B., Baldwin, A., Louis, S., Rodriguez, D., and Taylor, C.G. 2009 Increased consumption of legumes improves arterial stiffness in peripheral vascular disease independent of blood pressure, weight and serum cholesterol. Experimental Biology 2009, April 18-22, New Orleans, LA. [oral presentation].
Pittaway JK, Ahuja KD, Chronopoulos A et al (2004) The effect of chickpeas on human serum lipids and lipoproteins. Asia Pac J Clin Nutr 13: S70
American Heart Association Nutrition Committee, Lichtenstein AH, Appel LJ, Brands M et al. (2006). Circulation 114: 82-96.

Responsible Party: Dr. Peter Zahradka, Professor, Department of Physiology, University of Manitoba
ClinicalTrials.gov Identifier: NCT01382056     History of Changes
Other Study ID Numbers: B2011:026
Study First Received: June 22, 2011
Last Updated: February 11, 2014
Health Authority: Canada: Ethics Review Committee

Keywords provided by University of Manitoba:
Peripheral Artery Disease
Pulses
Beans
PAD

Additional relevant MeSH terms:
Peripheral Arterial Disease
Atherosclerosis
Arteriosclerosis
Arterial Occlusive Diseases
Vascular Diseases
Cardiovascular Diseases
Peripheral Vascular Diseases

ClinicalTrials.gov processed this record on September 11, 2014