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Acute Effects of Watermelon on Vascular Function and Serum Lycopene

27 december 2021 uppdaterad av: Amy Ellis, University of Alabama, Tuscaloosa
This study aimed to examine the effects of a one-time dose of 100% watermelon juice on circulating lycopene levels and measures of vascular health among a cohort of postmenopausal women.

Studieöversikt

Status

Avslutad

Betingelser

Intervention / Behandling

Detaljerad beskrivning

Purpose and Objectives Arterial stiffness and endothelial dysfunction are early independent predictors of cardiovascular disease (CVD), the leading cause of death for women ages 60 and older in the United States. It is well-known that age-related decreases in vascular function are partially due to increases in oxidative stress and inflammation. In attempts to combat CVD, previous studies have investigated provision of isolated food compounds in supplement form. For example, purified lycopene has been shown to decrease oxidative stress, and our previous work supports the supplemental use of glutamine and arginine powders for improving vascular endothelial function of older adults. Watermelon is among the greatest plant sources of arginine and glutamine, and it is one of the richest sources of lycopene. However, clinical studies evaluating the whole food have not been done.

According to the Healthy Eating Index, only 27% of women ages 60 and older meet the daily dietary recommendations for 2.5 fruit servings. Likewise, although no Recommended Dietary Allowance for lycopene exists, this age group consumes less lycopene daily than is provided in one serving of watermelon. While reasons for poor fruit intake among older adults are multifactorial, difficulty chewing and inability to prepare fresh foods in the home environment have been noted as significant barriers to fresh fruit and vegetable intake. Of note, a previous systematic review suggests that 100% fruit and vegetable juices may be practical vehicles for improving intake of antioxidant nutrients among older adults. The provision of 100% watermelon juice to older adult women represents a practical, innovative approach to increase consumption of a food containing multiple components that may act in synergy to improve vascular function. Therefore, the purpose of this study is to investigate the effects of a one-time serving of 100% watermelon juice on blood vessel function and serum lycopene.

Specific Aims

The specific aims of this study are to:

  1. To determine whether consumption of a 12-ounce serving of 100% watermelon juice by non-obese women ages 60-75 will result in increased levels of serum lycopene.

    Hypotheses: Acute supplementation with 100% watermelon juice will result in increased serum lycopene.

  2. To determine whether consumption of a 12-ounce serving of 100% watermelon juice by non-obese women ages 60-75 will result in improved vascular endothelial function as assessed by flow-mediated dilation (FMD) and decreased arterial stiffness as assessed by pulse wave analysis (PWA).

Hypotheses: Acute supplementation with 100% watermelon juice will result in improved vascular endothelial function and decreased arterial stiffness.

Studietyp

Observationell

Inskrivning (Faktisk)

11

Kontakter och platser

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Studieorter

    • Alabama
      • Tuscaloosa, Alabama, Förenta staterna, 35487
        • University of Alabama

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

65 år till 70 år (Äldre vuxen)

Tar emot friska volontärer

Ja

Kön som är behöriga för studier

Kvinna

Testmetod

Icke-sannolikhetsprov

Studera befolkning

Community-dwelling postmenopausal women

Beskrivning

Inclusion Criteria:

  • Body mass index 18.5 - 29.9 kg/m2 (non-obese)
  • Ambulatory
  • Postmenopausal female
  • Ages 65-70 years

Exclusion Criteria:

  • Food allergy to watermelon
  • Diagnosis of phenylketonuria
  • History of hypotension, chronic uncontrolled hypertension, chronic kidney disease, diabetes, previous cardiac events or procedures,
  • Smoking or other tobacco use
  • Use of anticoagulant medications, cholesterol-lowering medications, vasodilatory dietary supplements (garlic, fish oil), or dietary supplements containing lycopene, ascorbic acid, L-glutamine, L-arginine, or L-citrulline
  • Weight change > 10% in the previous six months

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Change From Baseline in Circulating Lycopene Levels
Tidsram: 2 hours post-ingestion
On the testing day, participants reported to the clinic following a 10-hour overnight fast. Blood samples were obtained by standard venipuncture at baseline and two hours after ingestion of a 360 ml dose of 100% pasteurized watermelon juice in order to determine change in serum lycopene levels.
2 hours post-ingestion

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Change From Baseline in Endothelial-dependent Vasodilation
Tidsram: 2 hours post-ingestion
Brachial artery flow-mediated dilation (FMD) was used to assess endothelial-dependent vasodilation. FMD uses ultrasound technology to quantify changes in brachial artery diameter in response to hyperemia. A blood pressure cuff was placed distal to the brachial artery of the right arm with the participant supine and rested. Pre-inflation diameter was recorded for one minute, and the cuff was inflated to 50 mmHg above resting SBP for five minutes. Then, images were recorded for 120 seconds after cuff deflation. Peak diameter was determined as an average of the five highest measurements over five seconds post-deflation. FMD was expressed as the percentage increase in peak diameter. FMD measurements were taken at baseline and 2 hours after ingestion of the 100% watermelon juice. The outcome measure reflects change in FMD from baseline to 2 hours post-ingestion.
2 hours post-ingestion

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Sponsor

Publikationer och användbara länkar

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Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Faktisk)

5 november 2015

Primärt slutförande (Faktisk)

8 december 2016

Avslutad studie (Faktisk)

8 december 2016

Studieregistreringsdatum

Först inskickad

24 juli 2018

Först inskickad som uppfyllde QC-kriterierna

24 juli 2018

Första postat (Faktisk)

31 juli 2018

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

14 mars 2022

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

27 december 2021

Senast verifierad

1 december 2021

Mer information

Termer relaterade till denna studie

Andra studie-ID-nummer

  • 15-07-95

Läkemedels- och apparatinformation, studiedokument

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