The Experts below are selected from a list of 1734 Experts worldwide ranked by ideXlab platform

Louise M. Burke - One of the best experts on this subject based on the ideXlab platform.

  • The effect of Beetroot Juice supplementation on repeat-sprint performance in hypoxia.
    Journal of sports sciences, 2018
    Co-Authors: Georgina L. Kent, Brian Dawson, Lars R. Mcnaughton, Gregory R. Cox, Louise M. Burke, Peter Peeling
    Abstract:

    This investigation assessed the effect of dietary nitrate (NO3−) supplementation, in the form of Beetroot Juice (BR), on repeat-sprint performance in normoxia and normobaric hypoxia. 12 male team-s...

  • single and combined effects of Beetroot Juice and caffeine supplementation on cycling time trial performance
    Applied Physiology Nutrition and Metabolism, 2014
    Co-Authors: Stephen C. Lane, Andrew M. Jones, John A. Hawley, Ben Desbrow, James R. Blackwell, Megan L. Ross, Adam J Zemski, Louise M. Burke
    Abstract:

    Both caffeine and Beetroot Juice have ergogenic effects on endurance cycling performance. We investigated whether there is an additive effect of these supplements on the performance of a cycling ti...

  • Single and combined effects of Beetroot Juice and caffeine supplementation on cycling time trial performance.
    Applied physiology nutrition and metabolism = Physiologie appliquee nutrition et metabolisme, 2013
    Co-Authors: Stephen C. Lane, Andrew M. Jones, John A. Hawley, Ben Desbrow, James R. Blackwell, Megan L. Ross, Adam J Zemski, Louise M. Burke
    Abstract:

    Both caffeine and Beetroot Juice have ergogenic effects on endurance cycling performance. We investigated whether there is an additive effect of these supplements on the performance of a cycling time trial (TT) simulating the 2012 London Olympic Games course. Twelve male and 12 female competitive cyclists each completed 4 experimental trials in a double-blind Latin square design. Trials were undertaken with a caffeinated gum (CAFF) (3 mg·kg(-1) body mass (BM), 40 min prior to the TT), concentrated Beetroot Juice supplementation (BJ) (8.4 mmol of nitrate (NO3(-)), 2 h prior to the TT), caffeine plus Beetroot Juice (CAFF+BJ), or a control (CONT). Subjects completed the TT (females: 29.35 km; males: 43.83 km) on a laboratory cycle ergometer under conditions of best practice nutrition: following a carbohydrate-rich pre-event meal, with the ingestion of a carbohydrate-electrolyte drink and regular oral carbohydrate contact during the TT. Compared with CONT, power output was significantly enhanced after CAFF+BJ and CAFF (3.0% and 3.9%, respectively, p < 0.01). There was no effect of BJ supplementation when used alone (-0.4%, p = 0.6 compared with CONT) or when combined with caffeine (-0.9%, p = 0.4 compared with CAFF). We conclude that caffeine (3 mg·kg(-1) BM) administered in the form of a caffeinated gum increased cycling TT performance lasting ∼50-60 min by ∼3%-4% in both males and females. Beetroot Juice supplementation was not ergogenic under the conditions of this study.

  • The effect of variable doses of inorganic nitrate-rich Beetroot Juice on simulated 2,000-m rowing performance in trained athletes.
    International journal of sports physiology and performance, 2013
    Co-Authors: Matthew W. Hoon, Jamie R. Blackwell, Andrew M. Jones, Nathan A. Johnson, Elizabeth Broad, Bronwen Lundy, Anthony J. Rice, Louise M. Burke
    Abstract:

    Context: Beetroot Juice is a naturally rich source of inorganic nitrate (NO3−), a compound hypothesized to enhance endurance performance by improving exercise efficiency. Purpose: To investigate the effect of different doses of Beetroot Juice on 2000-m ergometer-rowing performance in highly trained athletes. Methods: Ten highly trained male rowers volunteered to participate in a placebo-controlled, double-blinded crossover study. Two hours before undertaking a 2000-m rowing-ergometer test, subjects consumed Beetroot Juice containing 0 mmol (placebo), 4.2 mmol (SINGLE), or 8.4 mmol (DOUBLE) NO3−. Blood samples were taken before supplement ingestion and immediately before the rowing test for analysis of plasma [NO3−] and [nitrite (NO2−)]. Results: The SINGLE dose demonstrated a trivial effect on time to complete 2000 m compared with placebo (mean difference: 0.2 ± 2.5 s). A possibly beneficial effect was found with DOUBLE compared with SINGLE (mean difference –1.8 ± 2.1 s) and with placebo (–1.6 ± 1.6 s). P...

Mario Siervo - One of the best experts on this subject based on the ideXlab platform.

  • Ageing modifies the effects of Beetroot Juice supplementation on 24-hour blood pressure variability: An individual participant meta-analysis
    Nitric oxide : biology and chemistry, 2015
    Co-Authors: Mario Siervo, Kirsten Brandt, Nigel Benjamin, Jose Lara, John C. Mathers, Ammar W. Ashor, A. Jajja, A. Sutyarjoko, O. Qadir, Paul G. Winyard
    Abstract:

    Abstract Objectives Abnormal circadian oscillations of blood pressure (BP) and nocturnal–diurnal BP differences (i.e., dipping) increase cardiovascular risk. Whether inorganic nitrate supplementation influences 24-hr BP variability is currently unknown. We studied the effects of high-nitrate Beetroot Juice supplementation on BP variability measured by 24-hr ambulatory BP monitoring (24-hr ABPM) in older subjects. Methods Data from four independent randomised clinical trials were collated. Eighty-five older participants (age range: 55–76 years) were included in the final database. Two trials had an open-label, parallel design and two trials had a cross-over, double-blind design. Participants were randomised to either Beetroot Juice or placebo. Changes in 24-hr ABPM (daily, diurnal, nocturnal), variability (weighted-SDs), night-dipping, morning surge for systolic and diastolic BP were measured. Meta-analysis was conducted to obtain pooled estimates of the effect size for each BP outcome. Sub-group analyses were conducted to evaluate the influence of age, BMI, gender, BP status and changes in nitrite concentrations on the effect size. Results The pooled effect of Beetroot Juice on all BP outcomes was not significant. Beetroot Juice ingestion determined a significant decrease in nocturnal systolic BP variability in subjects aged less than 65 y (2.8 mmHg, −4.5 −1.0, p = 0.002) compared to the older group (≥65 y; 1.0 mmHg, −2.2 4.2, p = 0.54). A greater change in NO 2 − concentrations after Beetroot supplementation was associated with significant differences for nocturnal mean (−3.4 mmHg, −0.6 −2.4, p = 0.02) and variability (−0.8 mmHg, −1.5 −0.06, p = 0.03) of systolic BP. Conclusions The vascular responsiveness to inorganic nitrate may be modified by mechanisms of vascular ageing influencing the reducing capacity to convert inorganic nitrate into nitrite and tissue-specific responses to dietary nitrate supplementation.

  • Effects of Beetroot Juice supplementation on microvascular blood flow in older overweight and obese subjects: a pilot randomised controlled study
    Journal of human hypertension, 2014
    Co-Authors: Ammar W. Ashor, Kirsten Brandt, Jose Lara, A. Jajja, A. Sutyarjoko, O. Qadir, Mario Siervo
    Abstract:

    Effects of Beetroot Juice supplementation on microvascular blood flow in older overweight and obese subjects: a pilot randomised controlled study

  • inorganic nitrate and Beetroot Juice supplementation reduces blood pressure in adults a systematic review and meta analysis
    Journal of Nutrition, 2013
    Co-Authors: Mario Siervo, Jose Lara, Ikponmwonsa Ogbonmwan, John C. Mathers
    Abstract:

    : Diets including food products rich in inorganic nitrate are associated with lower blood pressure (BP). The evidence for the BP-lowering effects of inorganic nitrate and Beetroot in randomized clinical trials has not been systematically assessed. The objective was to conduct a systematic review and meta-analysis of randomized clinical trials that examined the effects of inorganic nitrate and Beetroot supplementation on BP. Medline, EMBASE, and Scopus databases were searched from inception to February 2013. The specific inclusion criteria were: 1) randomized clinical trials; 2) trials reporting effects on systolic or diastolic BP or both; and 3) trials comparing inorganic nitrate or Beetroot Juice supplementation with placebo control groups. Random-effects models were used to assess the pooled BP effect sizes. Sixteen trials met the eligibility criteria for the systematic review. All studies had a crossover study design. The trials were conducted between 2006 and 2012 and included a total of 254 participants with 7-30 participants/study. The duration of each intervention ranged from 2 h to 15 d. Inorganic nitrate and Beetroot Juice consumption were associated with greater changes in systolic BP [-4.4 mm Hg (95% CI: -5.9, -2.8); P < 0.001] than diastolic BP [-1.1 mm Hg (95% CI: -2.2, 0.1); P = 0.06]. The meta-regression showed an association between daily dose of inorganic nitrate and changes in systolic BP (P < 0.05). Inorganic nitrate and Beetroot Juice supplementation was associated with a significant reduction in systolic BP. These findings need to be tested in long-term trials and in individuals at greater cardiovascular risk.

  • Inorganic Nitrate and Beetroot Juice Supplementation Reduces Blood Pressure in Adults: A Systematic Review and
    2013
    Co-Authors: Mario Siervo, Jose Lara, Ikponmwonsa Ogbonmwan, John C. Mathers
    Abstract:

    Diets including food products rich in inorganic nitrate are associated with lower blood pressure (BP). The evidence for the BP-lowering effects of inorganic nitrate and Beetroot in randomized clinical trials has not been systematically assessed. The objective was to conduct a systematic review and meta-analysis of randomized clinical trials that examined the effects of inorganic nitrate and Beetroot supplementation on BP. Medline, EMBASE, and Scopus databases were searched from inception to February 2013. The specific inclusion criteria were: 1) randomized clinical trials; 2) trials reporting effects on systolic or diastolic BP or both; and 3) trials comparing inorganic nitrate or Beetroot Juice supplementation with placebo control groups. Random-effects models were used to assess the pooled BP effect sizes. Sixteen trials met the eligibility criteria for the systematic review. All studies had a crossover study design. The trials were conducted between 2006 and 2012 and included a total of 254 participants with 7‐30 participants/study. The duration of each intervention ranged from 2 h to 15 d. Inorganic nitrate and Beetroot Juice consumption were associated with greater changes in systolic BP [24.4 mm Hg (95% CI: 25.9, 22.8); P < 0.001] than diastolic BP [21.1 mm Hg (95% CI: 22.2, 0.1); P = 0.06]. The meta-regression showed an association between daily dose of inorganic nitrate and changes in systolic BP (P < 0.05). Inorganic nitrate and Beetroot Juice supplementation was associated with a significant reduction in systolic BP. These findings need to be tested in long-term trials and in individuals at greater cardiovascular risk. J. Nutr. doi: 10.3945/jn.112.170233.

Andrew M. Jones - One of the best experts on this subject based on the ideXlab platform.

  • Influence of muscle oxygenation and nitrate-rich Beetroot Juice supplementation on O2 uptake kinetics and exercise tolerance.
    Nitric oxide : biology and chemistry, 2020
    Co-Authors: Stuart Cocksedge, Lee J. Wylie, Andrew M. Jones, Brynmor Breese, Leonardo Nogueira, Christopher Thompson, Paul T. Morgan, Stephen J. Bailey
    Abstract:

    Abstract We tested the hypothesis that acute supplementation with nitrate (NO3−)-rich Beetroot Juice (BR) would improve quadriceps muscle oxygenation, pulmonary oxygen uptake ( V ˙ O 2 ) kinetics and exercise tolerance (Tlim) in normoxia and that these improvements would be augmented in hypoxia and attenuated in hyperoxia. In a randomised, double-blind, cross-over study, ten healthy males completed two-step cycle tests to Tlim following acute consumption of 210 mL BR (18.6 mmol NO3−) or NO3−-depleted Beetroot Juice placebo (PL; 0.12 mmol NO3−). These tests were completed in normobaric normoxia [fraction of inspired oxygen (FIO2): 21%], hypoxia (FIO2: 15%) and hyperoxia (FIO2: 40%). Pulmonary V ˙ O 2 and quadriceps tissue oxygenation index (TOI), derived from multi-channel near-infrared spectroscopy, were measured during all trials. Plasma [nitrite] was higher in all BR compared to all PL trials (P  V ˙ O 2 in hypoxia (P   0.05). These findings indicate that BR supplementation is more likely to improve Tlim and peak V ˙ O 2 in situations when skeletal muscle is more hypoxic.

  • single and combined effects of Beetroot Juice and caffeine supplementation on cycling time trial performance
    Applied Physiology Nutrition and Metabolism, 2014
    Co-Authors: Stephen C. Lane, Andrew M. Jones, John A. Hawley, Ben Desbrow, James R. Blackwell, Megan L. Ross, Adam J Zemski, Louise M. Burke
    Abstract:

    Both caffeine and Beetroot Juice have ergogenic effects on endurance cycling performance. We investigated whether there is an additive effect of these supplements on the performance of a cycling ti...

  • Single and combined effects of Beetroot Juice and caffeine supplementation on cycling time trial performance.
    Applied physiology nutrition and metabolism = Physiologie appliquee nutrition et metabolisme, 2013
    Co-Authors: Stephen C. Lane, Andrew M. Jones, John A. Hawley, Ben Desbrow, James R. Blackwell, Megan L. Ross, Adam J Zemski, Louise M. Burke
    Abstract:

    Both caffeine and Beetroot Juice have ergogenic effects on endurance cycling performance. We investigated whether there is an additive effect of these supplements on the performance of a cycling time trial (TT) simulating the 2012 London Olympic Games course. Twelve male and 12 female competitive cyclists each completed 4 experimental trials in a double-blind Latin square design. Trials were undertaken with a caffeinated gum (CAFF) (3 mg·kg(-1) body mass (BM), 40 min prior to the TT), concentrated Beetroot Juice supplementation (BJ) (8.4 mmol of nitrate (NO3(-)), 2 h prior to the TT), caffeine plus Beetroot Juice (CAFF+BJ), or a control (CONT). Subjects completed the TT (females: 29.35 km; males: 43.83 km) on a laboratory cycle ergometer under conditions of best practice nutrition: following a carbohydrate-rich pre-event meal, with the ingestion of a carbohydrate-electrolyte drink and regular oral carbohydrate contact during the TT. Compared with CONT, power output was significantly enhanced after CAFF+BJ and CAFF (3.0% and 3.9%, respectively, p < 0.01). There was no effect of BJ supplementation when used alone (-0.4%, p = 0.6 compared with CONT) or when combined with caffeine (-0.9%, p = 0.4 compared with CAFF). We conclude that caffeine (3 mg·kg(-1) BM) administered in the form of a caffeinated gum increased cycling TT performance lasting ∼50-60 min by ∼3%-4% in both males and females. Beetroot Juice supplementation was not ergogenic under the conditions of this study.

  • The effect of variable doses of inorganic nitrate-rich Beetroot Juice on simulated 2,000-m rowing performance in trained athletes.
    International journal of sports physiology and performance, 2013
    Co-Authors: Matthew W. Hoon, Jamie R. Blackwell, Andrew M. Jones, Nathan A. Johnson, Elizabeth Broad, Bronwen Lundy, Anthony J. Rice, Louise M. Burke
    Abstract:

    Context: Beetroot Juice is a naturally rich source of inorganic nitrate (NO3−), a compound hypothesized to enhance endurance performance by improving exercise efficiency. Purpose: To investigate the effect of different doses of Beetroot Juice on 2000-m ergometer-rowing performance in highly trained athletes. Methods: Ten highly trained male rowers volunteered to participate in a placebo-controlled, double-blinded crossover study. Two hours before undertaking a 2000-m rowing-ergometer test, subjects consumed Beetroot Juice containing 0 mmol (placebo), 4.2 mmol (SINGLE), or 8.4 mmol (DOUBLE) NO3−. Blood samples were taken before supplement ingestion and immediately before the rowing test for analysis of plasma [NO3−] and [nitrite (NO2−)]. Results: The SINGLE dose demonstrated a trivial effect on time to complete 2000 m compared with placebo (mean difference: 0.2 ± 2.5 s). A possibly beneficial effect was found with DOUBLE compared with SINGLE (mean difference –1.8 ± 2.1 s) and with placebo (–1.6 ± 1.6 s). P...

  • Beetroot Juice and exercise: pharmacodynamic and dose-response relationships.
    Journal of applied physiology (Bethesda Md. : 1985), 2013
    Co-Authors: Lee J. Wylie, James Kelly, Stephen J. Bailey, Jamie R. Blackwell, Philip F. Skiba, Paul G. Winyard, Asker E. Jeukendrup, Anni Vanhatalo, Andrew M. Jones
    Abstract:

    Dietary supplementation with Beetroot Juice (BR), containing approximately 5–8 mmol inorganic nitrate (NO3−), increases plasma nitrite concentration ([NO2−]), reduces blood pressure, and may positi...

Stephen J. Bailey - One of the best experts on this subject based on the ideXlab platform.

Pradyuman Kumar - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of spray drying parameters for Beetroot Juice powder using response surface methodology (RSM)
    Journal of the Saudi Society of Agricultural Sciences, 2018
    Co-Authors: Bindu Bazaria, Pradyuman Kumar
    Abstract:

    Abstract The optimization of Beetroot Juice powder was devised using Box-Behnken design to optimize the spray drying parameters of inlet air temperature (IAT) (160–180 °C), maltodextrin (MD) addition rate (5–15%) and feed flow rate (FFR) (400–600 ml/h). The experimental results were ( p p p  > 0.05 except hygroscopicity. The optimum conditions were found as 160 °C inlet air temperature and 400 ml/h feed flow rate and a maltodextrin concentration of 15% with using desirability function.

  • Comparative analysis of bio-polymers addition on structural and physical properties of spray dried Beetroot Juice concentrate
    Journal of Food Processing and Preservation, 2017
    Co-Authors: Bindu Bazaria, Pradyuman Kumar
    Abstract:

    Present work investigated the comparative effect of adding biopolymers [maltodextrin (MD), gum Arabic (GA), and whey protein concentrate (WPC)] as drying carriers on physical and structural properties of spray dried Beetroot Juice concentrate (BJC). Powder yield, hygroscopicity, bulk density, a* value, morphology, crystallography, and glass transition temperature (Tg) were studied as responses. The highest product yield of 77.46% was obtained from whey protein concentrate. The bulk density of the powders were decreased significantly (p ˂.05) with WPC 

  • compositional changes in functional attributes of vacuum concentrated Beetroot Juice
    Journal of Food Processing and Preservation, 2016
    Co-Authors: Bindu Bazaria, Pradyuman Kumar
    Abstract:

    Beetroot was processed into Juice and concentrate was obtained using rotary vacuum evaporation. The study investigated the effects of concentration temperature (45C, 50C, 55C and 60C) and time (5–30 min) on total solids, betalain, color, total phenolic content (TPC), antioxidant activity and nitrate content of concentrated Beetroot Juices. Betalain (composed of betacyanin + betaxanthin) and color value changed significantly (P < 0.05) with processing temperature and time. Betacyanin and betaxanthin of Beetroot Juice concentrate (BJC) increased up to concentration temperature of 55C thereafter it decreased notably. Same trends have been followed by total phenolic and nitrate content of BJC. Also, nitrate content varied significantly over vast range nevertheless below the safety range defined by WHO. “L” and “a” value of BJC decreased substantially due to loss of the red color as heat destroyed betacyanin pigments. A highly significant correlation (r2 = 0.9775) was demonstrated between TPC and radical scavenging activity (%RSA) of BJC samples. Practical Applications Preservation of vegetables for consumption exposes the physicochemical, color, antioxidant characteristics to detrimental factors that may lead to alterations in their concentrations and health-related quality. Beetroot (Beta vulgarius) Juice contains antioxidants along with nitrates with potential health benefits and hence has an aptitude as functional ingredients. Moreover, pigment (Betalains) found in Beetroot Juices are well-established colorant for various food uses under regulation, having E.No.-162. Preferably, this study is focused on the determination of the effects of processing temperature and time on the quality components of Beetroot Juice. The results can be a guide to having a processing method under vacuum that can be used in producing Beetroot Juice concentrate with good sensory properties and high bioactive compounds.

  • Effect of dextrose equivalency of maltodextrin together with Arabic gum on properties of encapsulated Beetroot Juice
    Journal of Food Measurement and Characterization, 2016
    Co-Authors: Bindu Bazaria, Pradyuman Kumar
    Abstract:

    Maltodextrin (MD) with a dextrose equivalency of 10 and 20 (10DE and 20DE) and Arabic gum (AG) were used as encapsulating materials for Beetroot Juice by spray drying. The produced encapsulates were evaluated in terms of encapsulation yield, moisture content, hygroscopicity, bulk density, color parameters (L*, a*, b* and TCD), radical scavenging activity (RSA), total phenolic content (TPC) and betalain content. The binary blend of encapsulating material significantly (P 

  • Rheological modeling of non-depectinized Beetroot Juice concentrates
    Journal of Food Measurement and Characterization, 2015
    Co-Authors: Sachin Kumar, Pradyuman Kumar
    Abstract:

    The rheological behavior of non-depectinized Beetroot Juice concentrate (25, 35, 45 and 55 °Brix) was studied over a wide range of temperature (30, 40, 50, 60, 70 and 80 °C) using a controlled rate, rotational rheometer. From the applied non-Newtonian rheological models, power law model was found to be the best fit with the values of flow behavior index ( n ) ranging from 0.6182 to 0.9962 showing the shear-thinning nature of Beetroot Juice concentrate ( n