A Single Dose of Beetroot Juice Enhances Cycling Performance in Simulated Altitude

2014 ◽  
Vol 46 (1) ◽  
pp. 143-150 ◽  
Author(s):  
David J. Muggeridge ◽  
Christopher C. F. Howe ◽  
Owen Spendiff ◽  
Charles Pedlar ◽  
Philip E. James ◽  
...  
Keyword(s):  
Single Dose ◽  
Cycling Performance ◽  
Beetroot Juice ◽  
Simulated Altitude

Erratum

2013 ◽  
Vol 23 (6) ◽  
pp. 642
Keyword(s):  
Single Dose ◽  
Production Process ◽  
Online Version ◽  
Sport Nutrition ◽  
Beetroot Juice ◽  
Exercise Metabolism

In the article by Muggeridge DJ, Howe C CF, Spendiff O, Pedlar C, James PE, Easton C, “The effects of a single dose of concentrated beetroot juice on performance in trained flatwater kayakers,” in the International Journal of Sport Nutrition and Exercise Metabolism 23(5), Figures 2 and 3 were incorrectly labeled due to an error in the production process. The online version of the article had been corrected. We apologize for the error.

[BP.07.06] ACUTE ADMINISTRATION (SINGLE DOSE) OF BEETROOT JUICE ATTENUATES BLOOD PRESSURE DURING ISOMETRIC EXERCISE IN UNTREATED HYPERTENSIVE PATIENTS

2017 ◽  
Vol 35 ◽  
pp. e265
Author(s):  
A. Triantafyllou ◽  
A. Zafeiridis ◽  
S. Papadopoulos ◽  
N. Koletsos ◽  
E. Gkaliagkousi ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Single Dose ◽  
Isometric Exercise ◽  
Acute Administration ◽  
Beetroot Juice ◽  
Hypertensive Patients

scholarly journals A single dose of beetroot juice improves endothelial function but not tissue oxygenation in pregnant women: a randomised clinical trial

2018 ◽  
Vol 120 (9) ◽  
pp. 1006-1013 ◽  
Author(s):  
Mônica Volino-Souza ◽  
Gustavo Vieira de Oliveira ◽  
Thiago Silveira Alvares
Keyword(s):  
Single Dose ◽  
Endothelial Function ◽  
Pregnant Women ◽  
Cardiovascular Health ◽  
Randomised Clinical Trial ◽  
Beetroot Juice ◽  
Double Blind ◽  
Muscle Oxygen ◽  
Significant Difference ◽  
Double Blind Design

AbstractBeetroot juice (BJ) consumption has been associated with improved cardiovascular health owing to an increase in NO bioconversion. This study evaluates the effect of BJ consumption on macrovascular endothelial function (flow-mediated dilation (FMD)) and muscle oxygen saturation (StO2) parameters in pregnant women within a randomised, crossover, double-blind design in which twelve pregnant women consumed a single dose (140 ml) of BJ or placebo (PLA). Urinary nitrate was assessed before (T0) and 150 min after BJ/PLA consumption. FMD was used to evaluate macrovascular endothelial function, and near-IR spectroscopy was used to evaluate muscle StO2 parameters during the occlusion and reperfusion phases, which were taken at baseline (PRE) and 120 and 140 min after BJ/PLA consumption, respectively. A significant increase in urinary nitrate was observed at 150 min after BJ consumption when compared with T0 (BJ: 0·20 (sd 0·13) v. T0: 0·02 (sd 0·00), P=0·000) and PLA intervention (PLA: 0·02 (sd 0·00), P=0·001). FMD improved after BJ consumption when compared with PRE (BJ: 11·00 (sd 1·67) v. PRE: 5·53 (sd 1·17), P=0·000) and PLA (5·34 (sd 1·31), P=0·000). No significant difference between PLA and PRE in FMD (P=1·000) was observed. In StO2 parameters, a difference was not observed after BJ consumption compared with PRE and PLA intervention. The data demonstrate that a single dose of 140 ml of BJ consumption improves macrovascular endothelial function, but not StO2 parameters.

scholarly journals Single and combined effects of beetroot juice and caffeine supplementation on cycling time trial performance

2014 ◽  
Vol 39 (9) ◽  
pp. 1050-1057 ◽  
Author(s):  
Stephen C. Lane ◽  
John A. Hawley ◽  
Ben Desbrow ◽  
Andrew M. Jones ◽  
James R. Blackwell ◽  
...  
Keyword(s):  
Best Practice ◽  
Latin Square ◽  
Time Trial ◽  
Cycling Performance ◽  
Cycle Ergometer ◽  
Beetroot Juice ◽  
Double Blind ◽  
Cycling Time Trial ◽  
Competitive Cyclists ◽  
Cycling Time

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.

scholarly journals Influence of Equimolar Doses of Beetroot Juice and Sodium Nitrate on Time Trial Performance in Handcycling

Nutrients ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1642 ◽  
Author(s):  
Joelle Leonie Flueck ◽  
Alessandro Gallo ◽  
Nynke Moelijker ◽  
Nikolay Bogdanov ◽  
Anna Bogdanova ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Single Dose ◽  
Oxygen Uptake ◽  
Body Mass ◽  
Sodium Nitrate ◽  
Power Output ◽  
Time Trial ◽  
Peak Oxygen Consumption ◽  
Beetroot Juice ◽  
Trial Performance

This study aimed to investigate the influence of a single dose of either beetroot juice (BR) or sodium nitrate (NIT) on performance in a 10 km handcycling time trial (TT) in able-bodied individuals and paracyclists. In total, 14 able-bodied individuals [mean ± SD; age: 28 ± 7 years, height: 183 ± 5 cm, body mass (BM): 82 ± 9 kg, peak oxygen consumption (VO2peak): 33.9 ± 4.2 mL/min/kg] and eight paracyclists (age: 40 ± 11 years, height: 176 ± 9cm, BM: 65 ± 9 kg, VO2peak: 38.6 ± 10.5 mL/min/kg) participated in the study. All participants had to perform three TT on different days, receiving either 6 mmol nitrate as BR or NIT or water as a placebo. Time-to-complete the TT, power output (PO), as well as oxygen uptake (VO2) were measured. No significant differences in time-to-complete the TT were found between the three interventions in able-bodied individuals (p = 0.80) or in paracyclists (p = 0.61). Furthermore, VO2 was not significantly changed after the ingestion of BR or NIT in either group (p < 0.05). The PO to VO2 ratio was significantly higher in some kilometers of the TT in able-bodied individuals (p < 0.05). The ingestion of BR or NIT did not increase handcycling performance in able-bodied individuals or in paracyclists.

scholarly journals Effects of a single dose of beetroot juice on cycling time trial performance at ventilatory thresholds intensity in male triathletes

2018 ◽  
Vol 15 (1) ◽  
Author(s):  
Manuel Vicente Garnacho-Castaño ◽  
Guillem Palau-Salvà ◽  
Eduardo Cuenca ◽  
Arturo Muñoz-González ◽  
Pablo García-Fernández ◽  
...  
Keyword(s):  
Single Dose ◽  
Time Trial ◽  
Beetroot Juice ◽  
Time Trial Performance ◽  
Cycling Time Trial ◽  
Cycling Time ◽  
Trial Performance

scholarly journals Single-dose prednisolone alters endocrine and haematologic responses and exercise performance in men

2019 ◽  
Vol 8 (2) ◽  
pp. 111-119 ◽  
Author(s):  
Alexander Tacey ◽  
Lewan Parker ◽  
Bu B Yeap ◽  
John Joseph ◽  
Ee M Lim ◽  
...  
Keyword(s):  
Heart Rate ◽  
Single Dose ◽  
Blood Glucose ◽  
Exercise Performance ◽  
High Intensity ◽  
Cycling Performance ◽  
Total Work ◽  
Post Exercise ◽  
High Intensity Interval ◽  
Interval Cycling

The aim of this study was to investigate the effect of a single dose of prednisolone on (A) high-intensity interval cycling performance and (B) post-exercise metabolic, hormonal and haematological responses. Nine young men participated in this double-blind, randomised, cross-over study. The participants completed exercise sessions (4 × 4 min cycling bouts at 90–95% of peak heart rate), 12 h after ingesting prednisolone (20 mg) or placebo. Work load was adjusted to maintain the same relative heart rate between the sessions. Exercise performance was measured as total work performed. Blood samples were taken at rest, immediately post exercise and up to 3 h post exercise. Prednisolone ingestion decreased total work performed by 5% (P < 0.05). Baseline blood glucose was elevated following prednisolone compared to placebo (P < 0.001). Three hours post exercise, blood glucose in the prednisolone trial was reduced to a level equivalent to the baseline concentration in the placebo trial (P > 0.05). Prednisolone suppressed the increase in blood lactate immediately post exercise (P < 0.05). Total white blood cell count was elevated at all time-points with prednisolone (P < 0.01). Androgens and sex hormone-binding globulin were elevated immediately after exercise, irrespective of prednisolone or placebo. In contrast, prednisolone significantly reduced the ratio of testosterone/luteinizing hormone (P < 0.01). Acute prednisolone treatment impairs high-intensity interval cycling performance and alters metabolic and haematological parameters in healthy young men. Exercise may be an effective tool to minimise the effect of prednisolone on blood glucose levels.

scholarly journals The Effects of a Single Dose of Concentrated Beetroot Juice on Performance in Trained Flatwater Kayakers

2013 ◽  
Vol 23 (5) ◽  
pp. 498-506 ◽  
Author(s):  
David J. Muggeridge ◽  
Christopher C. F. Howe ◽  
Owen Spendiff ◽  
Charles Pedlar ◽  
Philip E. James ◽  
...  
Keyword(s):  
Single Dose ◽  
Time Trial ◽  
Individual Variability ◽  
Beetroot Juice ◽  
Graded Exercise ◽  
Maximum Work ◽  
Plasma Nitrate ◽  
The Individual ◽  
Plasma Nitrite ◽  
20 Nm

The aim of the current study was to determine the effects of dietary nitrate ingestion on parameters of submaximal and supramaximal exercise and time trial (TT) performance in trained kayakers. Eight male kayakers completed four exercise trials consisting of an initial discontinuous graded exercise test to exhaustion and three performance trials using a kayak ergometer. The performance trials were composed of 15 min of paddling at 60% of maximum work rate, five 10-s all-out sprints, and a 1 km TT. The second and third trials were preceded by ingestion of either 70 ml nitrate-rich concentrated beetroot juice (BR) or tomato juice (placebo [PLA]) 3 hr before exercise using a randomized crossover design. Plasma nitrate (PLA: 33.8 ± 1.9 μM, BR: 152 ± 3.5 μM) and nitrite (PLA: 519.8 ± 25.8, BR: 687.9 ± 20 nM) were higher following ingestion of BR compared with PLA (both p < .001). VO2 during steady-state exercise was lower in the BR trial than in the PLA trial (p = .010). There was no difference in either peak power in the sprints (p = .590) or TT performance between conditions (PLA: 277 ± 5 s, BR: 276 ± 5 s, p = .539). Despite a reduction in VO2, BR ingestion appears to have no effect on repeated supramaximal sprint or 1 km TT kayaking performance. A smaller elevation in plasma nitrite following a single dose of nitrate and the individual variability in this response may partly account for these findings.

The Response of Testes Cells to Low Level, Single dose Helium Particle Irradiation

1982 ◽  
Vol 40 ◽  
pp. 252-253
Author(s):  
D.E. Philpott ◽  
W. Sapp ◽  
C. Williams ◽  
J. Stevenson ◽  
S. Black ◽  
...  
Keyword(s):  
Stem Cell ◽  
Single Dose ◽  
B Cell ◽  
Cell Survival ◽  
Spermatogonial Stem Cell ◽  
Low Doses ◽  
Particle Irradiation ◽  
Stem Cell Survival ◽  
Irradiation Injury ◽  
Radio Sensitivity

Spermatogonial stem-cell survival after irradiation injury has been studied in rodents by histological counts of surviving cells. Many studies, including previous work from our laboratory, show that the spermatogonial population demonstrates a heterogeneous response to irradiation. The spermatogonia increase in radio-sensitivity as differentiation proceeds through the sequence As - Apr - A1 - A2 - A3 - A4 - In - B. The stem (As) cell is the most resistant and the B cell is the most sensitive. The purpose of this work is to investigate the response of spermatogonial cell to low doses (less than 10 0 rads) of helium particle irradiation.

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