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https://www.readbyqxmd.com/read/29589768/ioc-consensus-statement-dietary-supplements-and-the-high-performance-athlete
#1
Ronald J Maughan, Louise M Burke, Jiri Dvorak, D Enette Larson-Meyer, Peter Peeling, Stuart M Phillips, Eric S Rawson, Neil P Walsh, Ina Garthe, Hans Geyer, Romain Meeusen, Luc van Loon, Susan M Shirreffs, Lawrence L Spriet, Mark Stuart, Alan Vernec, Kevin Currell, Vidya M Ali, Richard G M Budgett, Arne Ljungqvist, Margo Mountjoy, Yannis Pitsiladis, Torbjørn Soligard, Uğur Erdener, Lars Engebretsen
Nutrition usually makes a small but potentially valuable contribution to successful performance in elite athletes, and dietary supplements can make a minor contribution to this nutrition program. Nonetheless, supplement use is widespread at all levels of sport. Products described as supplements target different issues, including the management of micronutrient deficiencies, supply of convenient forms of energy and macronutrients, and provision of direct benefits to performance or indirect benefits such as supporting intense training regimens...
March 28, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29540367/ioc-consensus-statement-dietary-supplements-and-the-high-performance-athlete
#2
Ronald J Maughan, Louise M Burke, Jiri Dvorak, D Enette Larson-Meyer, Peter Peeling, Stuart M Phillips, Eric S Rawson, Neil P Walsh, Ina Garthe, Hans Geyer, Romain Meeusen, Lucas J C van Loon, Susan M Shirreffs, Lawrence L Spriet, Mark Stuart, Alan Vernec, Kevin Currell, Vidya M Ali, Richard Gm Budgett, Arne Ljungqvist, Margo Mountjoy, Yannis P Pitsiladis, Torbjørn Soligard, Uğur Erdener, Lars Engebretsen
Nutrition usually makes a small but potentially valuable contribution to successful performance in elite athletes, and dietary supplements can make a minor contribution to this nutrition programme. Nonetheless, supplement use is widespread at all levels of sport. Products described as supplements target different issues, including (1) the management of micronutrient deficiencies, (2) supply of convenient forms of energy and macronutrients, and (3) provision of direct benefits to performance or (4) indirect benefits such as supporting intense training regimens...
April 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29527927/acute-beetroot-juice-administration-improves-peak-isometric-force-production-in-adolescent-males
#3
David Bender, Jeremy R Townsend, William Vantrease, Autumn C Marshall, Ruth N Henry, Stephen Heffington, Kent D Johnson
The purpose of this study was to examine the effects of acute beetroot juice (BR) administration on repeated sprint performance and isometric force production in adolescent males. Twelve male adolescents (16.8 ± 1.0 yrs; 178.8 ± 9.2 cm; 74.8 ± 12.5 kg; peak height velocity: 2.53 ± 1.2 yrs) participated in this double-blind, placebo-controlled, crossover designed study. Participants consumed 2 x 70 mL of BR (~12.9 mmol NO3¯; Beet It Sport®) or a nitrate-depleted placebo (PL) 2.5 hours prior to performing isometric mid-thigh pulls (IMTP) and four repeated 20-second Wingate sprints (S1-S4) interspersed with 4 minutes of rest...
March 10, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29465269/evidence-based-supplements-for-the-enhancement-of-athletic-performance
#4
Peter Peeling, Martyn J Binnie, Paul S R Goods, Marc Sim, Louise M Burke
A strong foundation in physical conditioning and sport-specific experience, in addition to a bespoke and periodized training and nutrition program, are essential for athlete development. Once these underpinning factors are accounted for, and the athlete reaches a training maturity and competition level where marginal gains determine success, a role may exist for the use of evidence-based performance supplements. However, it is important that any decisions surrounding performance supplements are made in consideration of robust information that suggests the use of a product is safe, legal, and effective...
February 21, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29412076/repeated-sprint-performance-and-plasma-responses-following-beetroot-juice-supplementation-do-not-differ-between-recreational-competitive-and-elite-sprint-athletes
#5
K L Jonvik, J Nyakayiru, J W van Dijk, K Maase, S B Ballak, J M G Senden, L J C van Loon, L B Verdijk
PURPOSE: There is an ongoing debate whether highly trained athletes are less responsive to the ergogenic properties of nitrate. We assessed the effects of nitrate supplementation on plasma nitrate and nitrite concentrations and repeated-sprint performance in recreational, competitive and elite sprint athletes. METHODS: In a randomized double-blinded cross-over design, recreational cyclists (n = 20), national talent speed-skaters (n = 22) and Olympic-level track cyclists (n = 10) underwent two 6-day supplementation periods; 140 mL/d nitrate-rich (BR; ∼800 mg/d) and nitrate-depleted (PLA; ∼0...
February 7, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29311764/effects-of-beetroot-juice-supplementation-on-intermittent-high-intensity-exercise-efforts
#6
REVIEW
Raúl Domínguez, José Luis Maté-Muñoz, Eduardo Cuenca, Pablo García-Fernández, Fernando Mata-Ordoñez, María Carmen Lozano-Estevan, Pablo Veiga-Herreros, Sandro Fernandes da Silva, Manuel Vicente Garnacho-Castaño
Beetroot juice contains high levels of inorganic nitrate (NO3 - ) and its intake has proved effective at increasing blood nitric oxide (NO) concentrations. Given the effects of NO in promoting vasodilation and blood flow with beneficial impacts on muscle contraction, several studies have detected an ergogenic effect of beetroot juice supplementation on exercise efforts with high oxidative energy metabolism demands. However, only a scarce yet growing number of investigations have sought to assess the effects of this supplement on performance at high-intensity exercise...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28641022/a-randomized-single-dose-parallel-study-on-enhancement-of-nitric-oxide-in-serum-and-saliva-with-the-use-of-natural-sports-supplement-in-healthy-adults
#7
Joby Jacob, Sreeraj Gopi, Chandradhara Divya
Sports supplements that stimulate the production of nitric oxide (NO) are widely promoted agents in the sports nutrition domain, and nitric oxide plays an important role to enhance the cardiovascular and physical fitness of the sports participants. The purpose of the study is to investigate whether oral intake of a sports nutritional supplement (Fitnox) is able to increase nitrate (NO3 - ) and nitrite (NO2 - ) levels in blood serum and saliva of healthy adults. Fitnox is a unique blend of Kaempferia parviflora methoxy flavones, pomegranate peel polyphenols, and Moringa oleifera leaf saponins...
March 4, 2018: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/28332111/practical-issues-in-evidence-based-use-of-performance-supplements-supplement-interactions-repeated-use-and-individual-responses
#8
REVIEW
Louise M Burke
Current sports nutrition guidelines recommend that athletes only take supplements following an evidence-based analysis of their value in supporting training outcomes or competition performance in their specific event. While there is sound evidence to support the use of a few performance supplements under specific scenarios (creatine, beta-alanine, bicarbonate, caffeine, nitrate/beetroot juice and, perhaps, phosphate), there is a lack of information around several issues needed to guide the practical use of these products in competitive sport...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28182502/effect-of-dietary-nitrate-supplementation-on-swimming-performance-in-trained-swimmers
#9
Sam Lowings, Oliver Michael Shannon, Kevin Deighton, Jamie Matu, Matthew John Barlow
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...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28150478/effects-of-silk-peptides-administration-on-fat-utilization-over-a-whole-day-in-mice
#10
Jisu Kim, Jonghoon Park, Bokyung Kim, Chi-Ho Lee, Kiwon Lim, Heajung Suh
Purpose: The aim of the present narrative review was to consider the evidence on the timing, optimal dose and intake duration of the main dietary supplements β-alanine, nitrate, caffeine, creatine, sodium bicarbonate, carbohydrate and protein. Methods: This review article will focuses on timing, optimal dose and intake duration of main dietary supplements for consuming. Results: This paper reviewed the evidence to determine the optimal time, efficacy doses and intake duration for sports supplements verified by scientific evidence that report a performance enhancing effect in both situation of laboratory and training settings...
December 31, 2016: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/28150472/timing-optimal-dose-and-intake-duration-of-dietary-supplements-with-evidence-based-use-in-sports-nutrition
#11
REVIEW
Alireza Naderi, Erick P de Oliveira, Tim N Ziegenfuss, MarkE T Willems
Purpose: The aim of the present narrative review was to consider the evidence on the timing, optimal dose and intake duration of the main dietary supplements β-alanine, nitrate, caffeine, creatine, sodium bicarbonate, carbohydrate and protein. Methods: This review article will focuses on timing, optimal dose and intake duration of main dietary supplements for consuming. Results: This paper reviewed the evidence to determine the optimal time, efficacy doses and intake duration for sports supplements verified by scientific evidence that report a performance enhancing effect in both situation of laboratory and training settings...
December 31, 2016: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/27822169/the-effect-of-six-days-of-dietary-nitrate-supplementation-on-performance-in-trained-crossfit-athletes
#12
RANDOMIZED CONTROLLED TRIAL
Samuel J Kramer, Daniel A Baur, Maria T Spicer, Matthew D Vukovich, Michael J Ormsbee
BACKGROUND: While it is well established that dietary nitrate reduces the metabolic cost of exercise, recent evidence suggests this effect is maintained 24 h following the final nitrate dose when plasma nitrite levels have returned to baseline. In addition, acute dietary nitrate was recently reported to enhance peak power production. Our purpose was to examine whether chronic dietary nitrate supplementation enhanced peak power 24 h following the final dose and if this impacted performance in a heavily power-dependent sport...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27777094/dietary-nitrate-supplementation-improves-sprint-and-high-intensity-intermittent-running-performance
#13
RANDOMIZED CONTROLLED TRIAL
Christopher Thompson, Anni Vanhatalo, Harry Jell, Jonathan Fulford, James Carter, Lara Nyman, Stephen J Bailey, Andrew M Jones
The influence of dietary nitrate (NO3 - ) supplementation on indices of maximal sprint and intermittent exercise performance is unclear. PURPOSE: To investigate the effects of NO3 - supplementation on sprint running performance, and cognitive function and exercise performance during the sport-specific Yo-Yo Intermittent Recovery level 1 test (IR1). METHODS: In a double-blind, randomized, crossover study, 36 male team-sport players received NO3 - -rich (BR; 70 mL·day-1 ; 6...
December 30, 2016: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/27552474/potential-harmful-effects-of-dietary-supplements-in-sports-medicine
#14
REVIEW
Louise Deldicque, Marc Francaux
PURPOSE OF REVIEW: The purpose of this article is to collect the most recent data regarding the safety of well-known or emerging dietary supplements used by athletes. RECENT FINDINGS: From January 2014 to April 2016, about 30 articles have been published in the field. New data show that 90% of sports supplements contain trace of estrogenic endocrine disruptors, with 25% of them having a higher estrogenic activity than acceptable. About 50% of the supplements are contaminated by melamine, a source of nonprotein nitrogen...
November 2016: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/27131407/pharmacokinetic-study-of-amaranth-extract-in-healthy-humans-a%C3%A2-randomized-trial
#15
RANDOMIZED CONTROLLED TRIAL
Deepa Subramanian, Swati Gupta
OBJECTIVE: Nitric oxide (NO) is one of the most important signaling molecules produced within the body. Continuous generation of NO is essential for the integrity of the cardiovascular system. The aim of this study was to assess whether oral intake of a nitrate (NO3-)-rich dietary supplement (amaranth extract) is able to increase NO3- and nitrite (NO2-) levels in blood plasma and saliva of healthy adults. METHODS: In the present study, bioavailability and pharmacokinetics of NO3- and NO2- from amaranth extract (2 g as single dose) was studied in 16 healthy individuals and compared with placebo in a crossover design...
July 2016: Nutrition
https://www.readbyqxmd.com/read/27050244/ingestion-of-a-nitric-oxide-enhancing-supplement-improves-resistance-exercise-performance
#16
RANDOMIZED CONTROLLED TRIAL
Scott L Mosher, S Andy Sparks, Emily L Williams, David J Bentley, Lars R Mc Naughton
Mosher, SL, Sparks, SA, Williams, EL, Bentley, DJ, and Mc Naughton, LR. Ingestion of a nitric oxide enhancing supplement improves resistance exercise performance. J Strength Cond Res 30 (12): 3520-3524, 2016-Studies have established that supplementation of nitrate increases nitric oxide which in turn improves exercise performance. The current study aimed to investigate the effects of nitrate ingestion on performance of bench press resistance exercise until failure. Twelve recreationally active (age, 21 ± 2 years, height, 177...
December 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26900386/oral-l-citrulline-supplementation-enhances-cycling-time-trial-performance-in-healthy-trained-men-double-blind-randomized-placebo-controlled-2-way-crossover-study
#17
RANDOMIZED CONTROLLED TRIAL
Takashi Suzuki, Masahiko Morita, Yoshinori Kobayashi, Ayako Kamimura
BACKGROUND: Many human studies report that nitric oxide (NO) improves sport performance. This is because NO is a potential modulator of blood flow, muscle energy metabolism, and mitochondrial respiration during exercise. L-Citrulline is an amino acid present in the body and is a potent endogenous precursor of L-arginine, which is a substrate for NO synthase. Here, we investigated the effect of oral L-citrulline supplementation on cycling time trial performance in humans. METHODS: A double-blind randomized placebo-controlled 2-way crossover study was employed...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/26855422/new-strategies-in-sport-nutrition-to-increase-exercise-performance
#18
REVIEW
G L Close, D L Hamilton, A Philp, L M Burke, J P Morton
Despite over 50 years of research, the field of sports nutrition continues to grow at a rapid rate. Whilst the traditional research focus was one that centred on strategies to maximise competition performance, emerging data in the last decade has demonstrated how both macronutrient and micronutrient availability can play a prominent role in regulating those cell signalling pathways that modulate skeletal muscle adaptations to endurance and resistance training. Nonetheless, in the context of exercise performance, it is clear that carbohydrate (but not fat) still remains king and that carefully chosen ergogenic aids (e...
September 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/26641379/increase-in-maximal-cycling-power-with-acute-dietary-nitrate-supplementation
#19
RANDOMIZED CONTROLLED TRIAL
Ernest G Rimer, Linda R Peterson, Andrew R Coggan, James C Martin
Muscle-shortening velocity and hence power have been shown to increase in the presence of nitric oxide (NO). NO availability increases after consuming nitrate (NO3(-)). Ingestion of NO3(-)rich beetroot juice (BRJ) has increased muscle power in untrained adults. PURPOSE: This study determined whether NO3(-) supplementation could acutely enhance maximal power in trained athletes. METHODS: In this double-blind, crossover study, 13 trained athletes performed maximal inertial-load cycling trials (3-4 s) immediately before (PRE) and after (POST) consuming either NO3(-)rich (NO3) or NO3(-)depleted (PLA) BRJ to assess acute changes (ie, within the same day) in maximal power (PMAX) and optimal pedaling rate (RPMopt)...
September 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/26614506/influence-of-beetroot-juice-supplementation-on-intermittent-exercise-performance
#20
RANDOMIZED CONTROLLED TRIAL
Lee J Wylie, Stephen J Bailey, James Kelly, James R Blackwell, Anni Vanhatalo, Andrew M Jones
PURPOSE: This study tested the hypothesis that nitrate (NO3-) supplementation would improve performance during high-intensity intermittent exercise featuring different work and recovery intervals. METHOD: Ten male team-sport players completed high-intensity intermittent cycling tests during separate 5-day supplementation periods with NO3 (-)-rich beetroot juice (BR; 8.2 mmol NO3- day(-1)) and NO3 (-)-depleted beetroot juice (PL; 0.08 mmol NO3- day(-1)). Subjects completed: twenty-four 6-s all-out sprints interspersed with 24 s of recovery (24 × 6-s); seven 30-s all-out sprints interspersed with 240 s of recovery (7 × 30-s); and six 60-s self-paced maximal efforts interspersed with 60 s of recovery (6 × 60-s); on days 3, 4, and 5 of supplementation, respectively...
February 2016: European Journal of Applied Physiology
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