Effect of Whole-grape Powder on Body Composition, Fat and Bone Serum Biomarkers in Postmenopausal Women
The purpose of the study is to provide whole-grape powder or a placebo as a supplement to postmenopausal women for 12 weeks to determine the effects on body composition and bone formation.It is hypothesized that 12 weeks of supplementation with whole-grape powder will decrease body fat via resveratrol's positive effects on metabolism and negative effects on fat cells.
|Study Design:||Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Basic Science
|Official Title:||The Effect of Whole-grape Powder on Body Composition, Fat, and Bone Serum Biomarkers in Postmenopausal Women|
- Effect of freeze-dried whole-grape powder on body composition in postmenopausal women [ Time Frame: 12 weeks ] [ Designated as safety issue: No ]Body composition measurements will be taken to assess the participant's percentage of fat and lean tissue. Height and weight of participants will be measured with a stadiometer and a calibrated electronic scale. In addition, waist circumference will be measured. The waist-to-hip ratio at the minimal waist and maximal hip locations will be measured with a steel measuring tape. Height (m) and weight (kg) will be used to measure the participant's body mass index. Participants will undergo a dual energy X-ray absorptiometry (DXA) scan. Total bone mineral density, percentages of fat and lean body mass and regional values of the android or gynoid regions will be measured.
- Effect of freeze-dried whole-grape powder on biomarkers of inflammation, adipose metabolism, and bone formation in post menopausal women. [ Time Frame: 12 weeks ] [ Designated as safety issue: No ]Freeze-dried whole-grape powder may improve body composition by increasing antioxidant capacity, resulting in decreased inflammatory eicosanoids derived from linoleic acid (ω-6), essential fatty acids (EFA) by cyclooxygenase-2 (Cox-2), and 5-lipoxygenase (5-Lox) enzymes such as prostaglandin E2 (PGE2) and leukotriene B4 (LTB4); PGE2 and LTB4 inhibit adipose tissue activity, indicated by reduction in fat using DXA, and markers of fat tissue metabolism such as serum leptin and serum adiponectin. In addition, it is hypothesized that freeze-dried whole-grape powder may reduce markers of bone resorption such as cross-linked N-teleopeptide of type I collagen (NTX) and increase bone formation markers such as bone-specific alkaline phosphatase (ALP), osteocalcin (OC), and insulin-like growth factor 1(IGF-1).
- Effect of freeze-dried whole-grape powder on bone resorption in postmenopausal women [ Time Frame: 12 weeks ] [ Designated as safety issue: No ]Freeze-dried whole-grape powder may reduce markers of bone resorption such as cross-linked N-teleopeptide of type I collagen (NTX) and increase bone formation markers such as bone-specific alkaline phosphatase (ALP), osteocalcin (OC), and insulin-like growth factor 1(IGF-1).
|Study Start Date:||April 2012|
|Study Completion Date:||September 2012|
|Primary Completion Date:||August 2012 (Final data collection date for primary outcome measure)|
Experimental: Freeze-dried whole-grape powder
Freeze-dried whole-grape powder (46g/day)will be provided to participants for 12 weeks.
Dietary Supplement: Freeze-dried whole-grape powder
Participants are provided the equivalent of two servings per day of freeze-dried grape powder in a double-blind, placebo controlled, randomized design to determine the impact of the phytochemical, resveratrol, on biomarkers of adipose metabolism and bone metabolism.
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|United States, Texas|
|Institute for Women's Health, Texas Woman's University|
|Denton, Texas, United States, 76204-5876|
|Principal Investigator:||Nancy M DiMarco, PhD||Professor and Director, Institute for Women's Health|