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https://www.readbyqxmd.com/read/28096758/effects-of-acute-ingestion-of-a-pre-workout-dietary-supplement-with-and-without-p-synephrine-on-resting-energy-expenditure-cognitive-function-and-exercise-performance
#1
Y Peter Jung, Conrad P Earnest, Majid Koozehchian, Elfego Galvan, Ryan Dalton, Dillon Walker, Christopher Rasmussen, Peter S Murano, Mike Greenwood, Richard B Kreider
BACKGROUND: The purpose of this study was to examine the effects of acute ingestion of a pre-workout dietary supplement (PWS) with and without p-synephrine (S) on perceptions of readiness to perform, cognitive function, exercise performance, and markers of safety. METHODS: In a randomized, double-blind, and counterbalanced manner; 25 healthy and recreationally active male and female participants ingested a flavored maltodextrin placebo (PLA), a PWS containing beta-alanine (3 g), creatine nitrate as a salt (2 g), arginine alpha-ketoglutarate (2 g), N-Acetyl-L-Tyrosine (300 mg), caffeine (284 mg), Mucuna pruiriens extract standardized for 15% L-Dopa (15 mg), Vitamin C as Ascorbic Acid (500 mg), niacin (60 mg), folate as folic acid (50 mg), and Vitamin B12 as Methylcobalamin (70 mg) with 2 g of maltodextrin and flavoring; or, the PWS with Citrus aurantium (PWS + S) extract standardized for 30% p-synephrine (20 mg)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28096757/effects-of-ingesting-a-pre-workout-dietary-supplement-with-and-without-synephrine-for-8%C3%A2-weeks-on-training-adaptations-in-resistance-trained-males
#2
Y Peter Jung, Conrad P Earnest, Majid Koozehchian, Minye Cho, Nick Barringer, Dillon Walker, Christopher Rasmussen, Mike Greenwood, Peter S Murano, Richard B Kreider
BACKGROUND: The purpose of this study was to examine whether ingesting a pre-workout dietary supplement (PWS) with and without synephrine (S) during training affects training responses in resistance-trained males. METHODS: Resistance-trained males (N = 80) were randomly assigned to supplement their diet in a double-blind manner with either a flavored placebo (PLA); a PWS containing beta-alanine (3 g), creatine nitrate as a salt (2 g), arginine alpha-ketoglutarate (2 g), N-Acetyl-L-Tyrosine (300 mg), caffeine (284 mg), Mucuna pruiriens extract standardized for 15% L-Dopa (15 mg), Vitamin C as Ascorbic Acid (500 mg), niacin (60 mg), folate as folic acid (50 mg), and Vitamin B12 as Methylcobalamin (70 mg); or, the PWS supplement with Citrus aurantium extract containing 20 mg of synephrine (PWS + S) once per day for 8-weeks during training...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28094488/effects-of-leg-contrast-strength-training-on-sprint-agility-and-repeated-change-of-direction-performance-in-male-soccer-players
#3
Mehréz Hammami, Yassine Negra, Roy J Shephard, Mohamed Souhaiel Chelly
BACKGROUND: Contrast training is popular technique among individuals who are involved in dynamic sports, having as its goal an increase in dynamic muscular performance. It is characterized by the use of high and low loads in the same strength training session. The present investigation aimed to determine the effects of adding 8--weeks of contrast strength training (CSTP) to regular soccer practice in U--17 male soccer players during the competitive season. We hypothesized that CSTP would enhance their performance...
January 17, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28080323/oral-adenosine-5-triphosphate-atp-administration-increases-postexercise-atp-levels-muscle-excitability-and-athletic-performance-following-a-repeated-sprint-bout
#4
Martin Purpura, John A Rathmacher, Matthew H Sharp, Ryan P Lowery, Kevin A Shields, Jeremy M Partl, Jacob M Wilson, Ralf Jäger
OBJECTIVE: Oral adenosine-5'-triphosphate (ATP) administration has failed to increase plasma ATP levels; however, chronic supplementation with ATP has shown to increase power, strength, lean body mass, and blood flow in trained athletes. The purpose of this study was to investigate the effects of ATP supplementation on postexercise ATP levels and on muscle activation and excitability and power following a repeated sprint bout. METHODS: In a double-blind, placebo-controlled, randomized design, 42 healthy male individuals were given either 400 mg of ATP as disodium salt or placebo for 2 weeks prior to an exercise bout...
January 12, 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28079707/effect-of-number-of-sprints-in-a-sit-session-on-change-in-vo2max-a-meta-analysis
#5
Niels Bj Vollaard, Richard S Metcalfe, Sean Williams
PURPOSE: Recent meta-analyses indicate that sprint interval training (SIT) improves cardiorespiratory fitness (V[Combining Dot Above]O2max), but the effects of various training parameters on the magnitude of the improvement remain unknown. The present meta-analysis examined the modifying effect of the number of sprint repetitions in a SIT session on improvements in V[Combining Dot Above]O2max. METHODS: The databases PubMed and Web of Science were searched for original studies that have examined pre- and post-training V[Combining Dot Above]O2max in adults following ≥2 weeks of training consisting of repeated (≥2) Wingate-type cycle sprints, published up to 1 May 2016...
January 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28050914/physiological-perceptual-and-performance-responses-associated-with-self-selected-versus-standardized-recovery-periods-during-a-repeated-sprint-protocol-in-elite-youth-football-players-a-preliminary-study
#6
Neil Gibson, Callum Brownstein, Derek Ball, Craig Twist
PURPOSE: To examine the physiological and perceptual responses of youth footballers to a repeated sprint protocol employing standardized and self-selected recovery. METHODS: Eleven male participants (13.7 ± 1.1 years) performed a repeated sprint assessment comprising 10 x 30 m efforts. Employing a randomized crossover design, repeated sprints were performed using 30 s and self-selected recovery periods. Heart rate was monitored continuously with ratings of perceived exertion (RPE) and lower body muscle power measured 2 min after the final sprint...
January 4, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28031765/physical-performance-during-water-polo-matches-the-effect-of-the-players-competitive-level
#7
Petros G Botonis, Argyris G Toubekis, Theodoros I Platanou
The purpose of the study was to compare playing intensity and performance changes within a water-polo match in players of different competitive levels. High-level (n = 7) and lower-level (n = 7) players performed a progressively increasing speed test of 5 x 200 m swimming and speed corresponding to lactate concentration of 4.0, 5.0 and 10.0 mmol•l-1 was calculated. Repeated sprint ability (8 x 20 m) was tested at pre-, the middle and post-match and a 400 m swimming test was completed at pre and post in five water-polo matches...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28031763/evolution-of-determinant-factors-of-repeated-sprint-ability
#8
Fernando Pareja-Blanco, Luis Suarez-Arrones, David Rodríguez-Rosell, Manuel López-Segovia, Pedro Jiménez-Reyes, Beatriz Bachero-Mena, Juan José González-Badillo
The aim of this study was to investigate the changes in the relationships between repeated sprint ability (RSA) and anthropometric measures as well as fitness qualities in soccer players. Twenty-one professional soccer players performed several anthropometric and physical tests including countermovement vertical jumps (CMJs), a straight-line 30 m sprint (T30), an RSA test (6 x 20 + 20 m with 20 s recovery), a progressive isoinertial loading test in a full squat, a Yo-Yo Intermittent Recovery Test Level-1 (YYIRT-1) and a 20 m shuttle run test (20mSRT)...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28031755/performance-effects-of-repetition-specific-gluteal-activation-protocols-on-acceleration-in-male-rugby-union-players
#9
Lorna Barry, Ian Kenny, Thomas Comyns
Warm-up protocols have the potential to cause an acute enhancement of dynamic sprinting performance. The purpose of this study was to evaluate the effects of three repetition specific gluteal activation warm-up protocols on acceleration performance in male rugby union players. Forty male academy rugby union players were randomly assigned to one of 4 groups (control, 5, 10 or 15 repetition gluteal activation group) and performed 10 m sprints at baseline and 30 s, 2, 4, 6 and 8 min after their specific intervention protocol...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28002177/selected-physiological-perceptual-and-physical-performance-changes-during-two-bouts-of-prolonged-high-intensity-intermittent-running-separated-by-72-hours
#10
Nicholas Dobbin, Kevin Lamb, Craig Twist
This study investigated the effects of performing a second 90-minute intermittent running protocol 72 hours after an initial trial on selected physiological, perceptual and sprint running measures. Eight sub-elite soccer players provided measures of isokinetic muscle function, counter-movement jump (CMJ), 10 m sprinting, and muscle soreness before, and at 0, 24, 48 and 72 h after a 90-minute intermittent high intensity running bout (IHIR 1). A second 90-minute intermittent high intensity running bout (IHIR 2) was performed 72 h after the first...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27996694/no-effect-of-acute-and-chronic-supramaximal-exercise-on-circulating-levels-of-the-myokine-sparc
#11
Preeyaphorn Songsorn, José Ruffino, Niels B J Vollaard
Myokines may play a role in the health benefits of regular physical activity. Secreted protein acidic rich in cysteine (SPARC) is a pleiotropic myokine that has been shown to be released into the bloodstream by skeletal muscle in response to aerobic exercise. As there is evidence suggesting that SPARC release may be linked to glycogen breakdown and activation of 5' adenosine monophosphate-activated protein kinase, we hypothesised that brief supramaximal exercise may also be associated with increased serum SPARC levels...
December 20, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27991484/relationship-between-the-handball-specific-complex-test-and-intermittent-field-test-performance-in-elite-professional-handball-players
#12
René Schwesig, Souhail Hermassi, Birgit Hoffmeyer, Lars Irlenbusch, Georg Fieseler, Frank Noack, Karl S Delank, Tim J Gabbett, Mohamed S Chelly
BACKGROUND: We investigated the relationship between the handball complex-test (HBCT) and two selected field tests in elite handball players. METHODS: Twenty one handball players (age: 25.2 ± 5.1 years) from the First Professional German League completed; the HBCT performed twice, total distance (TD) covered in the Yo-Yo Intermittent Recovery Test and repeated shuttle sprint ability (RSA) (6 x (15 + 15 m)) starting every 20 s. RSA results were evaluated in three ways: best time (RSAbest), total time (RSATT) and decrement (RSAdec)...
December 16, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27931052/a-6-week-sprint-interval-training-program-changes-anaerobic-power-quadriceps-moment-and-subcutaneous-tissue-thickness
#13
S Han, H Lee, H Kim, D Kim, C Choi, J Park
We examined the effects of a 6-week 40-m one-way sprint interval training program (based on sprint time). 13 untrained healthy male collegiate students performed six 40-m sprints with a 60-s resting interval between sprints during the first week, and one sprint was added each week until the sixth week. If the 40-m sprint time exceeded 110% of the fastest baseline 40-m sprint time, the run was repeated. Repeated-sprint cycling test (every 3 weeks), quadriceps moment (every 2 weeks), and abdominal and thigh subcutaneous tissue thickness (every 2 weeks) were measured...
December 8, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27930743/effects-of-four-weeks-of-%C3%AE-alanine-supplementation-on-repeated-sprint-ability-in-water-polo-players
#14
Gabriel Motta Pinheiro Brisola, Guilherme Giannini Artioli, Marcelo Papoti, Alessandro Moura Zagatto
The purpose of this study was to investigate the effect of four weeks of β-alanine supplementation on repeated sprint ability in water polo players. Twenty-two male water polo players participated in the study, divided randomly into two homogeneous groups (placebo and β-alanine groups). The study design was double-blind, parallel and placebo controlled. Before and after the supplementation period (28 days), the athletes performed two specific repeated sprint ability tests interspaced by a 30-minute swimming test...
2016: PloS One
https://www.readbyqxmd.com/read/27919826/should-blood-pressure-goal-be-individualized-in-hypertensive-patients
#15
REVIEW
Alexandra Yannoutsos, Rania Kheder-Elfekih, Jean-Michel Halimi, Michel E Safar, Jacques Blacher
The aim of the present review is to consider the clinical relevance of individualized blood pressure (BP) goal under treatment in hypertensive patients according to their age, comorbidities or established cardiovascular (CV) disease. Evidence from large-scale randomized trials to support a lower BP goal, as initially recommended by guidelines in high-risk hypertensive patients, were lacking. Recently, the randomized intervention SPRINT trial studied two treatment targets for systolic BP (120mm Hg versus 140mm Hg in the intensive and standard treatment group, respectively) among high-risk hypertensive patients, without diabetes and without a history of prior stroke...
December 2, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27918670/combined-plyometric-strength-training-improves-ice-hockey-players-on-ice-sprint
#16
Torstein E Dæhlin, Ole C Haugen, Simen Haugerud, Ivana Hollan, Truls Raastad, Bent R Rønnestad
: Combined plyometric and strength training have previously been suggested as a strategy to improve skating performance in ice hockey players. However, the effects of combined plyometric and strength training has not been previously been compared to the effects of strength training only. PURPOSE: To compare the effects of combined plyometric and strength training on ice hockey players' skating sprint performance with strength training only. METHODS: Eighteen participants were randomly assigned to two groups that completed 5 strength-training sessions per week for 8 weeks...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918667/neuromuscular-fatigue-aetiology-after-repeated-sprints-depends-on-exercise-modality
#17
Katja Tomazin, Jean-Benoit Morin, Guillaume Y Millet
PURPOSE: The aim of the study was to compare neuromuscular fatigue induced by repeated sprint running vs cycling. METHODS: Eleven active male participants performed two repeated maximal sprint protocol (5×6 s, 24-s rest periods, 4 sets, 3-min between sets), one in running (treadmill) and one in cycling (cycle ergometer). Neuromuscular function, evaluated before (PRE), 30 s after the first (S1), the second (S2), and the last set (LAST), and 5 min after the last set (POST5), consisted in determining knee extensors maximal voluntary torque (MVC), voluntary activation (VA), single twitch (Tw), high- (Db100) and low- (Db10) frequency torque, and maximal muscle compound action potential (M-wave) amplitude and duration of vastus lateralis...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918661/how-does-a-short-interrupted-recovery-break-affect-performance-and-how-is-it-assessed-a-study-on-acute-effects
#18
Maximilian Pelka, Alexander Ferrauti, Tim Meyer, Mark Pfeiffer, Michael Kellmann
A recovery process with optimal prerequisites, which is interrupted, is termed disrupted recovery. Whether this process has an influence on performance-related factors needs to be investigated. Therefore, the aim of this study was to examine how a short disturbance of a recovery phase is assessed and whether subsequent repeated sprint performance is affected by it. A quasi-experimental 2x2-factors cross-over design with 34 sport science undergraduate students (age 20.3 ± 2.1) was applied. Factors were the type of intervention (power nap vs...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27904629/effect-of-various-kinds-of-beverages-on-stress-oxidative-f2-isoprostane-serum-lipid-and-blood-glucose-of-elite-taekwondo-players
#19
Zahra Maghsoudi, Ashfin Shiranian, Gholamreza Askai, Reza Ghaisvand
BACKGROUND: Athletes' recovery is important in improving their performance. Nutritional strategies can be effective in enhancing recovery rate. Choosing the best food items in appropriate intervals can play effective roles in resynthesis of fuels and recovery of muscle injury. Beverage micro and macronutrient content are helpful in fuel restoration. In this study, we assess the effects of various kinds of beverages on oxidative stress, muscle injury, and metabolic risk factors in taekwondo players...
September 2016: Iranian Journal of Nursing and Midwifery Research
https://www.readbyqxmd.com/read/27901339/cardiac-parasympathetic-reactivation-after-small-sided-soccer-games-and-repeated-sprints-in-untrained-healthy-adolescents
#20
Amri Hammami, Sofien Kasmi, Narimen Yousfi, Marwa Bouamra, Zouhaier Tabka, Ezdine Bouhlel
BACKGROUND: It has been shown that recreational soccer was a highly motivating and social activity which produces large improvements in health-related indices in sedentary healthy and unhealthy subjects. The purpose of this study was to compare the acute parasympathetic reactivation after small-sided soccer games (SSG) and repeated sprints training (RST) sessions. METHODS: Eight post-pubertal untrained adolescents (age 15.8 ± 0.6 years, body mass 59.1 ± 3.7 kg, height 1...
November 30, 2016: Journal of Sports Medicine and Physical Fitness
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