Short-term supplement of virgin coconut oil improves endothelial-dependent dilation but not exercise-mediated hyperemia in young adults.
Nutr Res
; 67: 17-26, 2019 07.
Article
em En
| MEDLINE
| ID: mdl-31102863
ABSTRACT
Virgin coconut oil (VCO) is high in antioxidants, which reduce reactive oxygen species-induced conversion of vascular endothelial-derived nitric oxide (NO) to toxic peroxynitrite. As such, flow-mediated dilation (FMD, a surrogate marker of NO bioavailability) and exercise-mediated hyperemia may be enhanced following VCO treatment. Animal research supports these findings, but direct assessments of FMD after short-term VCO use in humans are unknown. We tested the hypotheses that a 4-week VCO supplement (30â¯mL·d-1) would improve popliteal artery (PA) FMD and the hyperemic response to aerobic exercise. Thirty-four young adults were divided into VCO (nâ¯=â¯19, 9 women, 22⯱â¯2â¯years, 24⯱â¯3â¯kg·m-2) and control (CON nâ¯=â¯15, 7 women, 24⯱â¯2â¯years, 24⯱â¯3â¯kg·m-2) groups. PA-FMD and blood flow were assessed via high-resolution duplex ultrasonography (Vivid i, GE Healthcare, Mississauga, Ontario, Canada). PA blood flow was measured at rest and for 5 minutes following a 10-minute bout of moderate-intensity (60% heart rate reserve) cycling exercise. Total PA blood volume was calculated as the integral of the 5-minute postexercise PA blood flow response. After 4â¯weeks, PA-FMD increased (Pâ¯=â¯.04) following VCO supplementation (4.9%⯱â¯0.9% to 5.5%⯱â¯1.2%) with no change (Pâ¯>â¯.9) in the CON group (5.7%⯱â¯2.1% to 5.8%⯱â¯1.9%). There were no differences (both Pâ¯>â¯.28) in the postexercise total PA blood volume response in either group (VCO 495⯱â¯355 to 598⯱â¯384 mL; CON 562⯱â¯362 to 488⯱â¯229 mL). Short-term VCO supplementation does not alter aerobic exercise-mediated blood flow responses in young adults. However, the augmented popliteal FMD response observed in the VCO supplement group indicates that short-term VCO supplementation improves vascular endothelial function in young, healthy adults.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Vasodilatação
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Endotélio Vascular
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Exercício Físico
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Suplementos Nutricionais
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Óleo de Coco
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Hiperemia
Limite:
Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Nutr Res
Ano de publicação:
2019
Tipo de documento:
Article