Beetroot Juice Improves On-Water 500 M Time-Trial Performance, and Laboratory-Based Paddling Economy in National and International-Level Kayak Athletes

2015 ◽  
Vol 25 (3) ◽  
pp. 278-284 ◽  
Author(s):  
Peter Peeling ◽  
Gregory R. Cox ◽  
Nicola Bullock ◽  
Louise M. Burke
Keyword(s):  
National Level ◽  
Time Trial ◽  
Energy System ◽  
Step Test ◽  
International Level ◽  
Beetroot Juice ◽  
Warm Up ◽  
Exercise Economy ◽  
Maximal Effort ◽  
Performance Trial

We assessed the ingestion of a beetroot juice supplement (BR) on 4-min laboratory-based kayak performance in national level male (n = 6) athletes (Study A), and on 500 m on-water kayak time-trial (TT) performance in international level female (n = 5) athletes (Study B). In Study A, participants completed three laboratory-based sessions on a kayak ergometer, including a 7 × 4 min step test, and two 4 min maximal effort performance trials. Two and a half hours before the warm-up of each 4 min performance trial, athletes received either a 70 ml BR shot containing ~4.8 mmol of nitrate, or a placebo equivalent (BRPLA). The distance covered over the 4 min TT was not different between conditions; however, the average VO2 over the 4 min period was significantly lower in BR (p = .04), resulting in an improved exercise economy (p = .05). In Study B, participants completed two field-based 500 m TTs, separated by 4 days. Two hours before each trial, athletes received either two 70 ml BR shots containing ~9.6 mmol of nitrate, or a placebo equivalent (BRPLA). BR supplementation significantly enhanced TT performance by 1.7% (p = .01). Our results show that in national-level male kayak athletes, commercially available BR shots (70 ml) containing ~4.8 mmol of nitrate improved exercise economy during laboratory-based tasks predominantly reliant on the aerobic energy system. Furthermore, greater volumes of BR (140 ml; ~9.6 mmol nitrate) provided to international-level female kayak athletes resulted in enhancements to TT performance in the field.

scholarly journals The Effect of Dietary Nitrate Supplementation on Physiology and Performance in Trained Cyclists

2017 ◽  
Vol 12 (5) ◽  
pp. 684-689 ◽  
Author(s):  
Joseph A. McQuillan ◽  
Deborah K. Dulson ◽  
Paul B. Laursen ◽  
Andrew E. Kilding
Keyword(s):  
Time Trial ◽  
Crossover Design ◽  
Moderate Intensity ◽  
Beetroot Juice ◽  
Double Blind ◽  
Dietary Nitrate ◽  
Performance Time ◽  
Exercise Economy ◽  
Nitrate Supplementation ◽  
And Performance

Purpose:To determine the effect of dietary nitrate (NO3 –) supplementation on physiology and performance in well-trained cyclists after 6–8 d of NO3 – supplementation.Methods:Eight competitive male cyclists (mean ± SD age 26 ± 8 y, body mass 76.7 ± 6.9 kg, VO2peak 63 ± 4 mL · kg–1 · min–1) participated in a double-blind, placebo-controlled, crossover-design study in which participants ingested 70 mL of beetroot juice containing ~4 mmol NO3 – (NIT) or a NO3 –-depleted placebo (PLA), each for 8 d. Replicating pretreatment measures, participants undertook an incremental ramp assessment to determine VO2peak and first (VT1) and second (VT2) ventilatory thresholds on d 6 (NIT6 and PLA6), moderate-intensity cycling economy on d 7 (NIT7 and PLA7), and a 4-km time trial (TT) on d 8 (NIT8 and PLA8).Results:Relative to PLA, 6 d of NIT supplementation produced unclear effects for VO2peak (mean ± 95% confidence limit: 1.8% ± 5.5%) and VT1 (3.7% ± 12.3%) and trivial effects for both VT2 (–1.0% ± 3.0%) and exercise economy on d 7 (–1.0% ± 1.6%). However, effects for TT performance time (–0.7% ± 0.9%) and power (2.4% ± 2.5%) on d 8 were likely beneficial.Conclusions:Despite mostly unclear outcomes for standard physiological determinants of performance, 8 d of NO3 – supplementation resulted in likely beneficial improvements to 4-km TT performance in well-trained male endurance cyclists.

Heart-Rate Recovery After Warm-up in Swimming: A Useful Predictor of Training Heart-Rate Response?

2017 ◽  
Vol 12 (6) ◽  
pp. 742-748 ◽  
Author(s):  
Sander P.M. Ganzevles ◽  
Arnold de Haan ◽  
Peter J. Beek ◽  
Hein A.M. Daanen ◽  
Martin J. Truijens
Keyword(s):  
Heart Rate ◽  
Heart Rate Recovery ◽  
National Level ◽  
Training Session ◽  
Training Load ◽  
Step Test ◽  
Swimming Velocity ◽  
Promising Alternative ◽  
Warm Up ◽  
Incremental Step

For training to be optimal, daily training load has to be adapted to the momentary status of the individual athlete, which is often difficult to establish. Therefore, the current study investigated the predictive value of heart-rate recovery (HRR) during a standardized warm-up for training load. Training load was quantified by the variation in heart rate during standardized training in competitive swimmers. Eight female and 5 male Dutch national-level swimmers participated in the study. They all performed 3 sessions consisting of a 300-m warm-up test and a 10 × 100-m training protocol. Both protocols were swum in front crawl at individually standardized velocities derived from an incremental step test. Velocity was related to 75% and 85% heart-rate reserve (% HRres) for the warm-up and training, respectively. Relative HRR during the first 60 s after the warm-up (HRRw-up) and differences between the actual and intended heart rate for the warm-up and the training (ΔHRw-up and ΔHRtr) were determined. No significant relationship between HRRw-up and ΔHRtr was found (F1,37 = 2.96, P = .09, R2 = .07, SEE = 4.65). There was considerable daily variation in ΔHRtr at a given swimming velocity (73–93% HRres). ΔHRw-up and ΔHRtr were clearly related (F1,37 = 74.31, P < .001, R2 = .67, SEE = 2.78). HRR after a standardized warm-up does not predict heart rate during a directly subsequent and standardized training session. Instead, heart rate during the warm-up protocol seems a promising alternative for coaches to make daily individual-specific adjustments to training programs.

scholarly journals High-Intensity Warm-Up Increases Anaerobic Energy Contribution during 100-m Sprint

Biology ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 198
Author(s):  
Seung-Bo Park ◽  
Da-Sol Park ◽  
Minjun Kim ◽  
Eunseok Lee ◽  
Doowon Lee ◽  
...  
Keyword(s):  
High Intensity ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Young Male ◽  
Time Trial ◽  
Energy System ◽  
Warm Up ◽  
Sprint Time ◽  
Physiological Variables ◽  
And Performance

This study aimed to evaluate the effects of warm-up intensity on energetic contribution and performance during a 100-m sprint. Ten young male sprinters performed 100-m sprints following both a high-intensity warm-up (HIW) and a low-intensity warm-up (LIW). Both the HIW and LIW were included in common baseline warm-ups and interventional warm-ups (eight 60-m runs, HIW; 60 to 95%, LIW; 40% alone). Blood lactate concentration [La−], time trial, and oxygen uptake (VO2) were measured. The different energy system contribution was calculated by using physiological variables. [La−1]Max following HIW was significantly higher than in LIW (11.86 ± 2.52 vs. 9.24 ± 1.61 mmol·L−1; p < 0.01, respectively). The 100-m sprint time trial was not significantly different between HIW and LIW (11.83 ± 0.57 vs. 12.10 ± 0.63 s; p > 0.05, respectively). The relative (%) phosphagen system contribution was higher in the HIW compared to the LIW (70 vs. 61%; p < 0.01, respectively). These results indicate that an HIW increases phosphagen and glycolytic system contributions as compared to an LIW for the 100-m sprint. Furthermore, an HIW prior to short-term intense exercise has no effect on a 100-m sprint time trial; however, it tends to improve times (decreased 100-m time trial; −0.27 s in HIW vs. LIW).

scholarly journals Diferencias en el salto vertical y la velocidad de patada mae-geri entre karatekas internacionales y nacionales

2013 ◽  
Vol 8 (1) ◽  
pp. 13 ◽  
Author(s):  
Carlos Balsalobre-Fernández ◽  
Víctor Martínez-Majolero ◽  
Jorge Villacieros-Rodríguez ◽  
Carlos María Tejero-González
Keyword(s):  
Lower Limb ◽  
High Speed ◽  
National Level ◽  
High Speed Camera ◽  
International Level ◽  
Warm Up ◽  
Explosive Strength ◽  
Counter Movement Jump ◽  
High Level ◽  
Effect Of Age

<p><strong><em>Aim</em></strong><strong>: </strong>Lower limb explosive strength and mae-geri kicking velocity are fundamental in karate competition; although it is unclear whether these variables could differentiate the high-level athletes. The objective of this research is to analyze the differences in the mae-geri kicking velocity and the counter-movement jump (CMJ) between a group of international top level karateka and another group of national-level karateka.</p><p><strong><em>Methods</em></strong><strong>: </strong>Thirteen international-level karateka and eleven national-level karateka participated in the study. After a standard warm-up, CMJ height (in cm) and mae-geri kicking velocity (in m/s) was measured using an IR-platform and a high-speed camera, respectively.</p><p><strong><em>Results</em></strong><strong>: </strong>Proceeding with MANCOVA to analyze the differences between groups controlling the effect of age, the results show that the international-level karateka demonstrated significantly higher levels of CMJ than national-level competitors (+22.1%, F = 9.47, p = 0.006, η<sup>2</sup> = 0.311). There were no significant differences between groups in the mae-geri kicking velocity (+5,7%, F=0.80; <em>p</em>=0.38; η<sup>2</sup>=0.03).</p><p><strong><em>Conclusion</em></strong><strong>: </strong>Our data shows, first, the importance of CMJ assessment as a tool to detect talent in karate and, second, that to achieve international-level in karate it may be important to increase CMJ levels to values ​​similar to those offered here.</p>

scholarly journals The Effects of Acute and Chronic Beetroot Juice Supplementation on Exercise Economy and Time Trial Performance in Recreationally Active Females

2018 ◽  
Vol 32 (S1) ◽  
Author(s):  
Kate A. Wickham ◽  
Devin G. McCarthy ◽  
Daniel T. Cervone ◽  
Lex B. Verdijk ◽  
Luc J. C. Loon ◽  
...  
Keyword(s):  
Time Trial ◽  
Beetroot Juice ◽  
Time Trial Performance ◽  
Exercise Economy ◽  
Trial Performance

The role of forensic science and forensic examination in international cooperation in the investigation of crimes

2021 ◽  
Vol 28 (1) ◽  
pp. 179-186
Author(s):  
Valery Yu. Shepitko ◽  
Mykhaylo V. Shepitko
Keyword(s):  
Forensic Science ◽  
International Cooperation ◽  
International Criminal ◽  
Expert Witness ◽  
International Crime ◽  
National Level ◽  
Criminal Court ◽  
Theory And Practice ◽  
International Level

The application of forensic science and expertise is a necessary prerequisite for the investigation of crimes at the local and national level. Without the use of forensic science and expertise, an investigation within the framework of a criminal process becomes dead and unsubstantiated. But with the globalisation of world processes, the development of technologies, the speed of information transmission, the formation of crime outside the borders of one state and its entry into the international level has become an urgent problem, which has become a challenge in countering such crime and the need to steer forensic science and expertise towards assisting law enforcement activities. A special feature of countering the investigation of crimes was the creation of international cooperation between forensic specialists and expert witnesses even prior to the establishment of practical institutions that could counteract them in practice. Therewith, some representatives of such international unions and associations have taken serious steps in creating mechanisms for real counteraction to crimes at the international level (R.A. Reiss, G. Soderman, M.Sh. Bassiuni). Coverage of the problem of international cooperation in the investigation of crimes through the definition of the role of forensic science and expertise allowed focusing on the following blocks: 1) international associations of forensic specialists for combating crime in the historical context; 2) international criminal police organisations in combating crime; 3) international cooperation in the field of conducting forensic examinations; 4) the use of forensic and special knowledge in the activities of the International Criminal Court. Thus, a combination of theory and practice in the fight against crime is demonstrated. Historically, this is associated with the role of forensic science and expertise in recording traces of crimes, analysing them, and forming legal, forensic, and expert witness opinions. The purpose of the study is to establish the decisive role of forensic science and expertise in international cooperation in the investigation of crimes. For this, the authors turned to forensic science and expertise, historical processes that served to create substantial international organisations created to counter international crime

scholarly journals Effect of Dietary Nitrate Supplementation on Swimming Performance in Trained Swimmers

2017 ◽  
Vol 27 (4) ◽  
pp. 377-384 ◽  
Author(s):  
Sam Lowings ◽  
Oliver Michael Shannon ◽  
Kevin Deighton ◽  
Jamie Matu ◽  
Matthew John Barlow
Keyword(s):  
Nitric Oxide ◽  
Repeated Measures ◽  
Swimming Performance ◽  
Time Trial ◽  
Mean Difference ◽  
Breath Hold ◽  
Double Blind ◽  
Nitric Oxide Concentration ◽  
Nitrate Supplementation ◽  
Maximal Effort

Nitrate supplementation appears to be most ergogenic when oxygen availability is restricted and subsequently may be particularly beneficial for swimming performance due to the breath-hold element of this sport. This represents the first investigation of nitrate supplementation and swimming time-trial (TT) performance. In a randomized double-blind repeated-measures crossover study, ten (5 male, 5 female) trained swimmers ingested 140ml nitrate-rich (~12.5mmol nitrate) or nitrate-depleted (~0.01mmol nitrate) beetroot juice. Three hours later, subjects completed a maximal effort swim TT comprising 168m (8 × 21m lengths) backstroke. Preexercise fractional exhaled nitric oxide concentration was significantly elevated with nitrate compared with placebo, Mean (SD): 17 (9) vs. 7 (3)p.p.b., p = .008. Nitrate supplementation had a likely trivial effect on overall swim TT performance (mean difference 1.22s; 90% CI -0.18–2.6s; 0.93%; p = .144; d = 0.13; unlikely beneficial (22.6%), likely trivial (77.2%), most unlikely negative (0.2%)). The effects of nitrate supplementation during the first half of the TT were trivial (mean difference 0.29s; 90% CI -0.94–1.5s; 0.46%; p = .678; d = 0.05), but there was a possible beneficial effect of nitrate supplementation during the second half of the TT (mean difference 0.93s; 90% CI 0.13–1.70s; 1.36%; p = .062; d = 0.24; possibly beneficial (63.5%), possibly trivial (36.3%), most unlikely negative (0.2%)). The duration and speed of underwater swimming within the performance did not differ between nitrate and placebo (both p > .30). Nitrate supplementation increased nitric oxide bioavailability but did not benefit short-distance swimming performance or the underwater phases of the TT. Further investigation into the effects of nitrate supplementation during the second half of performance tests may be warranted.

scholarly journals Irina Oberländer-Târnoveanu, Patrimoniul arheologic național: politici, documentare, acces / The National Archaeological Heritage: Policies, Documentation, Access

2013 ◽  
Vol 1 (1-2) ◽  
pp. 7-36
Keyword(s):  
Cultural Memory ◽  
National Level ◽  
International Level ◽  
Archaeological Heritage ◽  
National Legislation ◽  
National Heritage ◽  
Great Progress ◽  
National Databases

Documentation of archaeological heritage is a fundamental tool for understanding and protection. Although we have a number of laws, conventions and recommendations to protect heritage at national, European and international level, their application in practice is not easy anywhere. Since 2000, The Romanian Ministry of Culture and CIMEC – The Institute for Cultural Memory (now a Department in the National Heritage Institute, since July 1, 2011) developed national databases for archaeological documentation, including sites, investigations and reports. By the end of 2013, there are three main archaeological databases at national level, all available online. The last 12 years means a great progress in regulating modern archaeology in Romania, agreeing national legislation with European and international ones, providing of tools and responses to the challenges of reality, primarily immediate threat to the archaeological heritage.

scholarly journals Neither Beetroot Juice Supplementation nor Increased Carbohydrate Oxidation Enhance Economy of Prolonged Exercise in Elite Race Walkers

Nutrients ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 2767
Author(s):  
Louise M. Burke ◽  
Rebecca Hall ◽  
Ida A. Heikura ◽  
Megan L. Ross ◽  
Nicolin Tee ◽  
...  
Keyword(s):  
Elite Athletes ◽  
Endurance Performance ◽  
Beetroot Juice ◽  
Future Studies ◽  
Exercise Economy ◽  
Parallel Group ◽  
Performance Effects ◽  
Race Walking ◽  
The Impact ◽  
Current Guidelines

Given the importance of exercise economy to endurance performance, we implemented two strategies purported to reduce the oxygen cost of exercise within a 4 week training camp in 21 elite male race walkers. Fourteen athletes undertook a crossover investigation with beetroot juice (BRJ) or placebo (PLA) [2 d preload, 2 h pre-exercise + 35 min during exercise] during a 26 km race walking at speeds simulating competitive events. Separately, 19 athletes undertook a parallel group investigation of a multi-pronged strategy (MAX; n = 9) involving chronic (2 w high carbohydrate [CHO] diet + gut training) and acute (CHO loading + 90 g/h CHO during exercise) strategies to promote endogenous and exogenous CHO availability, compared with strategies reflecting lower ranges of current guidelines (CON; n = 10). There were no differences between BRJ and PLA trials for rates of CHO (p = 0.203) or fat (p = 0.818) oxidation or oxygen consumption (p = 0.090). Compared with CON, MAX was associated with higher rates of CHO oxidation during exercise, with increased exogenous CHO use (CON; peak = ~0.45 g/min; MAX: peak = ~1.45 g/min, p < 0.001). High rates of exogenous CHO use were achieved prior to gut training, without further improvement, suggesting that elite athletes already optimise intestinal CHO absorption via habitual practices. No differences in exercise economy were detected despite small differences in substrate use. Future studies should investigate the impact of these strategies on sub-elite athletes’ economy as well as the performance effects in elite groups.

scholarly journals The Future of International Statistical Data Sharing and New Issues of Interaction

2019 ◽  
Vol 26 (7) ◽  
pp. 55-66
Author(s):  
O. E. Bashina ◽  
N. A. Komkova ◽  
L. V. Matraeva ◽  
V. E. Kosolapova
Keyword(s):  
Information Technology ◽  
International Organizations ◽  
Continuous Monitoring ◽  
Statistical Data ◽  
National Level ◽  
International Level ◽  
It Infrastructure ◽  
General Statistical ◽  
Practical Recommendations ◽  
Metadata Generation

The article deals with challenges and prospects of implementation of the Statistical Data and Metadata eXchange (SDMX) standard and using it in the international sharing of statistical data and metadata. The authors identified potential areas where this standard can be used, described a mechanism for data and metadata sharing according to SDMX standard. Major issues classified into three groups - general, statistical, information technology - were outlined by applying both domestic and foreign experience of implementation of the standard. These issues may arise at the national level (if the standard is implemented domestically), at the international level (when the standard is applied by international organizations), and at the national-international level (if the information is exchanged between national statistical data providers and international organizations). General issues arise at the regulatory level and are associated with establishing boundaries of responsibility of counterpart organizations at all three levels of interaction, as well as in terms of increasing the capacity to apply the SDMX standard. Issues of statistical nature are most often encountered due to the sharing of large amounts of data and metadata related to various thematic areas of statistics; there should be a unified structure of data and metadata generation and transmission. With the development of information sharing, arise challenges and issues associated with continuous monitoring and expanding SDMX code lists. At the same time, there is a lack of a universal data structure at the international level and, as a result, it is difficult to understand and apply at the national level the existing data structures developed by international organizations. Challenges of information technology are related to creating an IT infrastructure for data and metadata sharing using the SDMX standard. The IT infrastructure (depending on the participant status) includes the following elements: tools for the receiving organizations, tools for sending organization and the infrastructure for the IT professionals. For each of the outlined issues, the authors formulated some practical recommendations based on the complexity principle as applied to the implementation of the international SDMX standard for the exchange of data and metadata.

Sign in / Sign up

Export Citation Format

Share Document