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Journal of the International Society of Sports Nutrition

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https://www.readbyqxmd.com/read/29764464/daytime-and-nighttime-casein-supplements-similarly-increase-muscle-size-and-strength-in-response-to-resistance-training-earlier-in-the-day-a-preliminary-investigation
#1
Jordan M Joy, Roxanne M Vogel, K Shane Broughton, Urszula Kudla, Nathaniel Y Kerr, Jason M Davison, Robert E C Wildman, Nancy M DiMarco
BACKGROUND: Casein protein consumed before sleep has been suggested to offer an overnight supply of exogenous amino acids for anabolic processes. The purpose of this study was to compare supplemental casein consumed earlier in the day (DayTime, DT) versus shortly before bed (NightTime, NT) on body composition, strength, and muscle hypertrophy in response to supervised resistance training. METHODS: Thirteen males participated in a 10-week exercise and dietary intervention while receiving 35 g casein daily...
May 15, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29743827/the-effect-of-carbohydrate-mouth-rinse-on-performance-biochemical-and-psychophysiological-variables-during-a-cycling-time-trial-a-crossover-randomized-trial
#2
Amanda M J Ferreira, Luiz F Farias-Junior, Thaynan A A Mota, Hassan M Elsangedy, Aline Marcadenti, Telma M A M Lemos, Alexandre H Okano, Ana P T Fayh
Background: The hypothesis of the central effect of carbohydrate mouth rinse (CMR) on performance improvement in a fed state has not been established, and its psychophysiological responses have not yet been described. The aim of this study was to evaluate the effect of CMR in athletes fed state on performance, biochemical and psychophysiological responses compared to ad libitum water intake. Methods: Eleven trained male cyclists completed a randomized, crossover trial, which consisted of a 30 km cycle ergometer at self-selected intensity and in a fed state...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29743826/effect-of-bilberry-juice-on-indices-of-muscle-damage-and-inflammation-in-runners-completing-a-half-marathon-a-randomised-placebo-controlled-trial
#3
Anthony Lynn, Samantha Garner, Nichola Nelson, Trevor N Simper, Anna C Hall, Mayur K Ranchordas
Background: Emerging evidence indicates that fruits rich in polyphenols may attenuate exercise-induced muscle damage and associated markers of inflammation and soreness. This study was conducted to determine whether bilberry juice (BJ), which is particularly rich in polyphenols, reduces markers of muscle damage in runners completing a half marathon. Methods: A total of 21 recreationally trained runners (age 30.9 ± 10.4 y; mass 71.6 ± 11.0 kg; M = 16; F = 5) were recruited to a single blind, randomised, placebo-controlled, parallel study...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29743825/creatine-electrolyte-supplementation-improves-repeated-sprint-cycling-performance-a-double-blind-randomized-control-study
#4
Daniel L Crisafulli, Harsh H Buddhadev, Lorrie R Brilla, Gordon R Chalmers, David N Suprak, Jun G San Juan
Background: Creatine supplementation is recommended as an ergogenic aid to improve repeated sprint cycling performance. Furthermore, creatine uptake is increased in the presence of electrolytes. Prior research examining the effect of a creatine-electrolyte (CE) supplement on repeated sprint cycling performance, however, did not show post-supplementation improvement. The purpose of this double blind randomized control study was to investigate the effect of a six-week CE supplementation intervention on overall and repeated peak and mean power output during repeated cycling sprints with recovery periods of 2 min between sprints...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29719493/effects-of-hydroxytyrosol-dose-on-the-redox-status-of-exercised-rats-the-role-of-hydroxytyrosol-in-exercise-performance
#5
Saad Al Fazazi, Rafael A Casuso, Jerónimo Aragón-Vela, Cristina Casals, Jesús R Huertas
Background: Hydroxytyrosol (HT) is a polyphenol found in olive oil that is known for its antioxidant effects. Here, we aimed to describe the effects of a low and high HT dose on the physical running capacity and redox state in both sedentary and exercised rats. Methods: Male Wistar rats were allocated into 6 groups: sedentary (SED; n  = 10); SED consuming 20 mg/kg/d HT (SED20; n  = 7); SED consuming 300 mg/kg/d HT (SED300; n = 7); exercised (EXE; n = 10); EXE consuming 20 mg/kg/d HT (EXE20; n = 10) and EXE consuming 300 mg/kg/d HT (EXE300; n = 10)...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29713250/effects-of-%C3%AE-alanine-supplementation-during-a-5-week-strength-training-program-a-randomized-controlled-study
#6
José Luis Maté-Muñoz, Juan H Lougedo, Manuel V Garnacho-Castaño, Pablo Veiga-Herreros, María Del Carmen Lozano-Estevan, Pablo García-Fernández, Fernando de Jesús, Jesús Guodemar-Pérez, Alejandro F San Juan, Raúl Domínguez
Background: β-Alanine (BA) is a non-essential amino acid that has been shown to enhance exercise performance. The purpose of this investigation was to determine if BA supplementation improved the adaptive response to five weeks of a resistance training program. Methods: Thirty healthy, strength-trained individuals were randomly assigned to the experimental groups placebo (PLA) or BA. Over 5 weeks of strength training, subjects in BA took 6.4 g/day of BA as 8 × 800 mg doses each at least 1...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29713249/effects-of-n-3-fatty-acids-and-exercise-on-oxidative-stress-parameters-in-type-2-diabetic-a-randomized-clinical-trial
#7
Ana Paula Trussardi Fayh, Katiuce Borges, Giovani Santos Cunha, Mauricio Krause, Ricardo Rocha, Paulo Ivo Homem de Bittencourt, José Cláudio Fonseca Moreira, Rogério Friedman, Juliane da Silva Rossato, Jõao Roberto Fernandes, Alvaro Reischak-Oliveira
Background: The relationship between diabetes and oxidative stress has been previously reported. Exercise represents a useful non-pharmacological strategy for the treatment in type 2 diabetic (T2DM) patients, but high intensity exercise can induce a transient inflammatory state and increase oxidative stress. Nutritional strategies that may contribute to the reduction of oxidative stress induced by acute exercise are necessary. The aim of this study was to examine if n-3 PUFA supplementation intervention can attenuate the inflammatory response and oxidative stress associated with high intensity exercise in this population...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29713248/development-and-validation-of-a-brief-general-and-sports-nutrition-knowledge-questionnaire-and-assessment-of-athletes-nutrition-knowledge
#8
Gina Louise Trakman, Adrienne Forsyth, Russell Hoye, Regina Belski
Background: The Nutrition for Sport Knowledge Questionnaire (NSKQ) is an 89-item, valid and reliable measure of sports nutrition knowledge (SNK). It takes 25 min to complete and has been subject to low completion and response rates. The aim of this study was to develop an abridged version of the NSKQ (A-NSKQ) and compare response rates, completion rates and NK scores of the NSKQ and A-NSKQ. Methods: Rasch analysis was used for the questionnaire validation. The sample ( n  = 181) was the same sample that was used in the validation of the full-length NSKQ...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29643758/prevalence-of-supplement-use-in-recreationally-active-kazakhstan-university-students
#9
Denis Vinnikov, Zhanna Romanova, Anar Dushpanova, Karashash Absatarova, Zhazira Utepbergenova
Background: Little is known about the supplements use and recreational sport practices in Kazakhstan university students. Therefore, the aim of this study was to ascertain supplements use prevalence and their predictors in this population. Methods: Cross-sectional survey of both undergraduate and graduate level students was completed in 2017 et al.-Farabi Kazakh National University, the largest higher institution in the country, from almost all Schools. A 45-item questionnaire was used to record physical activity, supplements use, lifestyle attributes (smoking, alcohol, sleep, etc...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29632452/prediction-equation-for-estimating-total-daily-energy-requirements-of-special-operations-personnel
#10
N D Barringer, S M Pasiakos, H L McClung, A P Crombie, L M Margolis
Background: Special Operations Forces (SOF) engage in a variety of military tasks with many producing high energy expenditures, leading to undesired energy deficits and loss of body mass. Therefore, the ability to accurately estimate daily energy requirements would be useful for accurate logistical planning. Purpose: Generate a predictive equation estimating energy requirements of SOF. Methods: Retrospective analysis of data collected from SOF personnel engaged in 12 different SOF training scenarios...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29568244/herbal-medicine-for-sports-a-review
#11
REVIEW
Maha Sellami, Olfa Slimeni, Andrzej Pokrywka, Goran Kuvačić, Lawrence D Hayes, Mirjana Milic, Johnny Padulo
The use of herbal medicinal products and supplements has increased during last decades. At present, some herbs are used to enhance muscle strength and body mass. Emergent evidence suggests that the health benefits from plants are attributed to their bioactive compounds such as Polyphenols, Terpenoids, and Alkaloids which have several physiological effects on the human body. At times, manufacturers launch numerous products with banned ingredient inside with inappropriate amounts or fake supplement inducing harmful side effect...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29568243/effects-of-a-high-fat-diet-on-superoxide-anion-generation-and-membrane-fluidity-in-liver-mitochondria-in-rats
#12
M Togo, N Konari, M Tsukamoto, R Kimoto, T Yamaguchi, H Takeda, I Kambayashi
Background: Obesity is a primary factor of lifestyle-related diseases, and the age of its onset has decreased. The reactive oxygen species (ROS), the superoxide anion, is generated in the mitochondrial electron transport chain and the damage it induces in cells may be a contributing factor to obesity-related lifestyle diseases. In the present study, the influence of the ingestion of a high-fat diet (HFD) on superoxide anion generation in rat liver mitochondria (Mt) and membrane fluidity was investigated...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29556158/calorie-restriction-regime-enhances-physical-performance-of-trained-athletes
#13
Victoria Pons, Joan Riera, Xavier Capó, Miquel Martorell, Antoni Sureda, Josep A Tur, Franchek Drobnic, Antoni Pons
Background: Caloric restriction induces mitochondrial biogenesis and improves physical fitness in rodents. We aimed to provide evidence of how caloric restriction affects the body composition and physical performance of trained athletes and to evaluate the possible impact of an every-other-day feeding diet on nutritional deficiencies of micronutrients and essential fatty acids. Methods: The study was performed with 12 healthy male athletes by carrying out a 33% caloric restriction with respect to their usual diet...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29527137/effects-of-caffeine-intake-on-muscle-strength-and-power-a-systematic-review-and-meta-analysis
#14
REVIEW
Jozo Grgic, Eric T Trexler, Bruno Lazinica, Zeljko Pedisic
Background: Caffeine is commonly used as an ergogenic aid. Literature about the effects of caffeine ingestion on muscle strength and power is equivocal. The aim of this systematic review and meta-analysis was to summarize results from individual studies on the effects of caffeine intake on muscle strength and power. Methods: A search through eight databases was performed to find studies on the effects of caffeine on: (i) maximal muscle strength measured using 1 repetition maximum tests; and (ii) muscle power assessed by tests of vertical jump...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29497353/how-much-protein-can-the-body-use-in-a-single-meal-for-muscle-building-implications-for-daily-protein-distribution
#15
REVIEW
Brad Jon Schoenfeld, Alan Albert Aragon
Controversy exists about the maximum amount of protein that can be utilized for lean tissue-building purposes in a single meal for those involved in regimented resistance training. It has been proposed that muscle protein synthesis is maximized in young adults with an intake of ~ 20-25 g of a high-quality protein; anything above this amount is believed to be oxidized for energy or transaminated to form urea and other organic acids. However, these findings are specific to the provision of fast-digesting proteins without the addition of other macronutrients...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29467598/an-attempt-to-induce-an-immunomodulatory-effect-in-rowers-with-spirulina-extract
#16
RANDOMIZED CONTROLLED TRIAL
Artur Juszkiewicz, Piotr Basta, Elżbieta Petriczko, Bogusław Machaliński, Jerzy Trzeciak, Karolina Łuczkowska, Anna Skarpańska-Stejnborn
Background: The aim of this study was to analyze the response of selected components of the immune system in rowers to maximal physical exercise, and to verify if this response can be modulated by supplementation with spirulina (cyanobacterium Spirulina platensis ) . Method: The double-blind study included 19 members of the Polish Rowing Team. The subjects were randomly assigned to the supplemented group ( n  = 10), receiving 1500 mg of spirulina extract for 6 weeks, or to the placebo group ( n  = 9)...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29449792/seric-concentrations-of-copper-chromium-manganesum-nickel-and-selenium-in-aerobic-anaerobic-and-mixed-professional-sportsmen
#17
Marcos Maynar, Francisco Llerena, Ignacio Bartolomé, Javier Alves, María-Concepción Robles, Francisco-Javier Grijota, Diego Muñoz
Background: The aim of the present study was to determine changes in serum concentrations of trace elements Cooper (Cu), Chromiun (Cr), Manganesum (Mn), Nickel (Ni) and Selenium (Se) in high-level sportsmen. Methods: Eighty professional athletes of different metabolic modalities, were recruited before the start of their training period. Thirty one sedentary participants of the same geographic area constituted the control group. Cu, Cr, Mn, Ni and Se analysis was performed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29449791/influence-of-acute-consumption-of-caffeine-vs-placebo-over-bia-derived-measurements-of-body-composition-a-randomized-double-blind-crossover-design
#18
RANDOMIZED CONTROLLED TRIAL
Cassie M Williamson, Brett S Nickerson, Emily E Bechke, Cherilyn N McLester, Brian M Kliszczewicz
Background: Bioelectrical impedance analysis (BIA) is often used to estimate total body water (TBW), intracellular body water (ICW), extracellular body water (ECW), and body fat percentage (BF%). A common restriction for BIA analysis is abstinence from caffeine 12-h prior to testing. However, research has yet to determine whether the consumption of caffeine influences BIA testing results. The purpose of this study was to determine if the consumption of caffeine influences BIA-derived BF% and body water values in habitual caffeine users...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29434529/high-protein-consumption-in-trained-women-bad-to-the-bone
#19
RANDOMIZED CONTROLLED TRIAL
Jose Antonio, Anya Ellerbroek, Cassandra Evans, Tobin Silver, Corey A Peacock
Background: It has been posited that the consumption of extra protein (> 0.8 g/kg/d) may be deleterious to bone mineral content. However, there is no direct evidence to show that consuming a high-protein diet results in a demineralization of the skeleton. Thus, the primary endpoint of this randomized controlled trial was to determine if a high-protein diet affected various parameters of whole body and lumbar bone mineral content in exercise-trained women. Methods: Twenty-four women volunteered for this 6-month investigation ( n  = 12 control, n = 12 high-protein)...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29410606/effects-of-lemon-verbena-extract-recoverben%C3%A2-supplementation-on-muscle-strength-and-recovery-after-exhaustive-exercise-a-randomized-placebo-controlled-trial
#20
Sybille Buchwald-Werner, Ioanna Naka, Manfred Wilhelm, Elivra Schütz, Christiane Schoen, Claudia Reule
Background: Exhaustive exercise causes muscle damage accompanied by oxidative stress and inflammation leading to muscle fatigue and muscle soreness. Lemon verbena leaves, commonly used as tea and refreshing beverage, demonstrated antioxidant and anti-inflammatory properties. The aim of this study was to investigate the effects of a proprietary lemon verbena extract (Recoverben®) on muscle strength and recovery after exhaustive exercise in comparison to a placebo product. Methods: The study was performed as a randomized, placebo-controlled, double-blind study with parallel design...
2018: Journal of the International Society of Sports Nutrition
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