Effects of Dietary Nitrate From Beetroot Juice on Vascular Function and Adaptations to Exercise Training in Postmenopausal Women: a Randomized, Placebo-controlled Study
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 54
- 试验地点
- 1
- 主要终点
- Forearm blood flow (FBF) response to acetylcholine (FBFACh)
研究概览
简要总结
The purpose of this clinical study in women after menopause is to investigate whether the daily intake of nitrate from beetroot juice over 12 weeks enhances the positive effect of exercise training on vascular function, blood pressure and physical performance.
The risk of cardiovascular diseases (CVD) increases with advancing age and women are particularly affected. In women, the decline in the sex hormone oestrogen in the blood circulation with menopause contributes to impaired vascular function and an increased CVD risk; in part through increased inflammatory processes, oxidative stress, and a reduced body's own production of nitric oxide (NO). NO is a signaling molecule that is important for vascular function. Endurance-based exercise training is a key lifestyle strategy to prevent CVD. However, studies indicate that exercise is less effective in terms of its health-promoting adaptations in women after menopause as compared with men of similar age.
This study investigates the effect of exercise training in combination with the intake of nitrate-rich beetroot juice on functions of the cardiovascular system. Nitrate is a nitrogen compound that is found naturally in plant foods (e.g. beetroot juice) and is converted to NO in the human body. Results of previous studies indicate vasodilatory, blood pressure-lowering and performance-enhancing effects as well as positive influences on inflammatory processes and oxidative stress following nitrate intake. The hypothesis is that nitrate intake concomitant to training promotes training adaptations and further improves vascular function, blood pressure and physical performance compared to training without nitrate intake.
For the study, 54 untrained postmenopausal women (with the ages between 45 and 65 years) will be recruited and randomly allocated into two groups. Both groups will undergo 12 weeks of endurance-based exercise training. One group will receive nitrate-rich beetroot juice, and the other nitrate-depleted beetroot juice (as placebo). Vascular function, blood pressure, maximum oxygen uptake, and blood biomarkers for nitrate metabolism, inflammation status and oxidative stress will be examined.
The anticipated study results will provide new insights into whether nitrate as a 'training adjunct' improves health-promoting training adaptations in women after menopause. The overall aim is to improve the cardiovascular health and performance of middle-aged women and reduce their increased CVD risk.
详细描述
Wider research context:
Advancing age is a major risk factor for cardiovascular diseases (CVD). In women, the decline in the sex hormone oestrogen with menopause contributes to impaired vascular function and an increased CVD risk, in part via a reduced bioavailability of the endothelium-derived signaling molecule nitric oxide (NO), chronic low-grade inflammation and increased oxidative stress. Aerobic (or endurance) exercise training is a key lifestyle strategy to prevent CVD. However, data indicate that exercise is less effective for improving cardiovascular health in postmenopausal women as compared with men of similar age. Oestrogen treatment may restore vascular training adaptations but is associated with health risks. The main objective of this research is to examine whether dietary nitrate as a nutritional 'adjuvant' to regular exercise could be an innovative lifestyle intervention to favorably modulate vascular training adaptations and health in midlife women. This research expands upon findings by the investigators and others showing that inorganic nitrate from vegetables exerts benefits on physical function and cardiovascular health by increasing NO availability through the nitrate-nitrite-NO pathway and by attenuating inflammation and oxidative stress.
Objectives and hypotheses:
The investigators propose a clinical study to examine whether the daily consumption of nitrate-rich beetroot juice concomitant with aerobic exercise training improves vascular function, blood pressure, and cardiovascular fitness in postmenopausal women more effectively as compared with nitrate-depleted beetroot juice consumption (as placebo). The hypothesis is that the increased nitrate intake favorably modulates the systemic inflammatory and oxidative stress status and promotes cardiovascular health-related training outcomes.
Methods:
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Triple (Participant, Investigator, Outcomes Assessor)
盲法说明
One group will receive nitrate-rich beetroot juice and the other group will receive nitrate-depleted beetroot juice (as placebo) during the training period, on the background of a low-nitrate diet and an otherwise unaltered lifestyle. All products will be obtained from the same supplier (James White Drinks Ltd., UK). The nitrate-depleted beetroot juice is generated for research purposes only. The two juices will be indistinguishable by taste, color, smell and packaging. The investigators involved in the data acquisition and analysis will be blind to the trial allocation until the study has been completed and all analyses have been performed.
入排标准
- 年龄范围
- 45 Years 至 65 Years（Adult, Older Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •Postmenopausal women (amenorrhoeic ≥1 year), between the ages of 45 and 65 years, inclusive, who are either normotensive or are medically treated for stage 1 hypertension
- •Written informed consent
排除标准
- •Current or recent (within previous 3 months) engagement in exercise training (i.e., planned, structured, and regular exercise) with an average net exercise time of >2 hours per week
- •Above-average cardiorespiratory fitness levels (i.e., a V̇O2 max max above the 75th percentile of age- and sex-specific normative data: ≥43 mL/kg/min for women aged 45-49 years, ≥38 mL/kg/min for women aged 50-59 years, ≥35 mL/kg/min for women aged 60-65 years)
- •Any evidence of acute or chronic diseases such as symptomatic cardiovascular or peripheral vascular disease, moderate or severe chronic kidney disease (estimated glomerular filtration rate (GFR) <50 mL/min), pulmonary, neural, or musculoskeletal disease, osteoporotic fractures, cancer, or type 1 or 2 diabetes mellitus
- •Fasting glucose >7.0 mmol/L or HbA1c > 6.5 rel. %
- •BMI <18.5 kg/m2 or >30kg/m2
- •A mean 24-hour ambulatory systolic/diastolic blood pressure of ≥130/80 mm Hg
- •Irregular resting electrocardiography (ECG)
- •Inability to perform physical exercise
- •Abnormal cardiovascular responses during the baseline V ̇O2 max test, including symptoms, ECG abnormalities, arrhythmias, or exaggerated blood pressure responses
- •Current or recent (<12 months) oestrogen-based hormone-replacement therapy
- •Chronic use of nitric oxide (NO) donors, organic nitrites/nitrates, Ticagrelor, sodium-glucose cotransporter 2 (SGLT2) inhibitors, high-dose statins (i.e., Simvastatin >40mg/day, Atorvastatin >20mg/day, Rosuvastatin >10mg/day), acetylsalicylic acid >100mg/day, non-steroidal anti-inflammatory drugs (NSAID)
- •A change in drug therapy likely to influence major outcomes within the previous 2 months, or likelihood that drug therapy would change during the study
- •Use of antibiotics (within previous 2 months)
- •Use of antibacterial mouthwash (volunteers willing to cease using antibacterial mouthwash for a period of 4 weeks before randomization will be included)
- •Being vegan or vegetarian or consumption of >5 serves of vegetables per day
- •Current or recent (within previous 6 months) significant (>6%) loss or gain of body weight
- •Current or recent (<12 months) regular smoking of >5 cigarettes per day
- •Alcohol intake of >70 g per week and/or binge drinking behaviour
- •Inability or unwillingness to follow the study protocol
研究组 & 干预措施
Placebo group
Daily consumption of 70 mL nitrate-depleted beetroot juice (placebo) concomitant with 12 weeks of exercise training
干预措施: Placebo group (Dietary Supplement)
Nitrate group
Daily consumption of 70 mL nitrate-rich beetroot juice concomitant with 12 weeks of exercise training
干预措施: Nitrate group (Dietary Supplement)
结局指标
主要结局
Forearm blood flow (FBF) response to acetylcholine (FBFACh)
时间窗: Change from baseline FBFACh to after the 12-week intervention period
Endothelial-dependent microvascular function
次要结局
- Maximal oxygen uptake (V̇O2 max)(Change from baseline V̇O2 max to after the 12-week intervention period)
- 24-hour ambulatory systolic blood pressure(Change from baseline 24 hour-ambulatory systolic blood pressure to after the 12-week intervention period)
研究者
Oliver Neubauer
Dr. (PhD) Priv.-Doz.
University of Vienna