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Journal of the International Society of Sports Nutrition

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https://www.readbyqxmd.com/read/27904439/training-time-frame-a-possible-key-to-literature-discrepancy-on-fasting-athletes
#1
Navid Moghadam, Farzin Farahbakhsh
There is a discrepancy in the literature as to whether fasting during Ramadan affects athletic performance. We suggest in this letter that the time frame for training is a confounding variable that has been missed in the literature.
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27895542/effect-of-tart-cherry-juice-on-recovery-and-next-day-performance-in-well-trained-water-polo-players
#2
Rachel McCormick, Peter Peeling, Martyn Binnie, Brian Dawson, Marc Sim
BACKGROUND: Tart Montmorency cherries contain high concentrations of phytochemicals and anthocyanins, which have recently been linked to improved athletic recovery and subsequent performance. To date however, previous work reporting promising results has focused on land-based endurance sports, with any potential benefits to team sports remaining unknown. As such, this investigation set-out to examine the effect of supplemental tart cherry juice (CJ) on recovery and next day athletic performance in highly-trained water-based team sport athletes over seven days...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27843418/effects-of-acute-carbohydrate-ingestion-on-anaerobic-exercise-performance
#3
Ben M Krings, Jaden A Rountree, Matthew J McAllister, Patrick M Cummings, Timothy J Peterson, Brent J Fountain, JohnEric W Smith
BACKGROUND: Carbohydrate (CHO) supplementation during endurance exercises has been shown to increase performance, but there is limited research with CHO supplementation during strength and conditioning exercises. Therefore, the purpose of this study was to examine the effects of various levels of CHO ingestion during acute testing sessions requiring participants to complete a strength and conditioning program designed for collegiate athletes. METHODS: Participants (n = 7) performed a series of exercises while ingesting an amino-acid electrolyte control (CON) or CON plus varying levels of CHO...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27822169/the-effect-of-six-days-of-dietary-nitrate-supplementation-on-performance-in-trained-crossfit-athletes
#4
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/27777542/gender-differences-and-access-to-a-sports-dietitian-influence-dietary-habits-of-collegiate-athletes
#5
Michael V Hull, Andrew R Jagim, Jonathan M Oliver, Mike Greenwood, Deanna R Busteed, Margaret T Jones
BACKGROUND: Limited research exists on the effect of a sports dietitian (SD) on athletes' dietary habits and nutrient periodization, which is the deliberate manipulation of macronutrient intake to match training goals. Further, the difference in dietary habits between men and women collegiate athletes has been understudied. A survey questionnaire examining dietary habits and practices was administered to athletes at two universities that employed a full time SD. Not all athletes used the SD as their primary source for nutritional guidance...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27777541/evidence-inconclusive-comment-on-article-by-schoenfeld-et-al
#6
David J Beale
This article comments on the study by Schoenfeld, et al. entitled "The effect of protein timing on muscle strength and hypertrophy: a meta-analysis" and discusses how the methodology led to inconclusive results.
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27688737/the-effect-of-inhalation-of-citrus-sinensis-flowers-and-mentha-spicata-leave-essential-oils-on-lung-function-and-exercise-performance-a-quasi-experimental-uncontrolled-before-and-after-study
#7
Nidal Amin Jaradat, Hamzeh Al Zabadi, Belal Rahhal, Azmi Mahmoud Ali Hussein, Jamal Shaker Mahmoud, Basel Mansour, Ahmad Ibrahim Khasati, Abdelkhaleq Issa
BACKGROUND: Recently, there has been an increased interest in the effects of essential oils on athletic performances and other physiological effects. This study aimed to assess the effects of Citrus sinensis flower and Mentha spicata leaves essential oils inhalation in two different groups of athlete male students on their exercise performance and lung function. METHODS: Twenty physical education students volunteered to participate in the study. The subjects were randomly assigned into two groups: Mentha spicata and Citrus sinensis (ten participants each)...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27651751/intestinal-adaptations-to-a-combination-of-different-diets-with-and-without-endurance-exercise
#8
Janice L Daniels, Richard J Bloomer, Marie van der Merwe, Samantha L Davis, Karyl K Buddington, Randal K Buddington
BACKGROUND: Endurance athletes search for diet regimens that will improve performance and decrease gastrointestinal disturbances during training and events. Although the intestine can adapt to changes in the amount and composition of dietary inputs, the responses to the combination of endurance exercise and diet are poorly understood. METHODS: We evaluated small intestinal dimensions and mucosal architecture and calculated the capacities of the entire small intestine to digest maltose and maltodextrin and absorb glucose in response to two different diet types; a western human diet and the Daniel Fast, a vegan style diet, and with moderate intensity endurance training or a no-exercise sedentary lifestyle for a 13 week period (n = 7 per group)...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27594812/assessment-of-hydration-status-of-elite-young-male-soccer-players-with-different-methods-and-new-approach-method-of-substitute-urine-strip
#9
Nesli Ersoy, Gulgun Ersoy, Mehmet Kutlu
BACKGROUND: The purpose of the study is to determine and compare the hydration status with different methods and determine fluid intake, dehydration percentages and sweat rate of 26 young male soccer players (15 ± 1.2 years) before an important competition. More specifically, the study aims at validating the urine strip and advising the players to use it as an easy and practical method. METHODS: Measurements of urine analysis were taken from the urine sample of the participants before breakfast and conducted for 3 consecutive days before the competition...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27489522/the-nad-precursor-nicotinamide-riboside-decreases-exercise-performance-in-rats
#10
Ioannis A Kourtzidis, Andreas T Stoupas, Ioannis S Gioris, Aristidis S Veskoukis, Nikos V Margaritelis, Maria Tsantarliotou, Ioannis Taitzoglou, Ioannis S Vrabas, Vassilis Paschalis, Antonios Kyparos, Michalis G Nikolaidis
BACKGROUND: Nicotinamide adenine dinucleotide (NAD(+)) and its phosphorylated form (NADP(+)) are key molecules in ubiquitous bioenergetic and cellular signaling pathways, regulating cellular metabolism and homeostasis. Thus, supplementation with NAD(+) and NADP(+) precursors emerged as a promising strategy to gain many and multifaceted health benefits. In this proof-of-concept study, we sought to investigate whether chronic nicotinamide riboside administration (an NAD(+) precursor) affects exercise performance...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27478425/interindividual-variability-in-sweat-electrolyte-concentration-in-marathoners
#11
Beatriz Lara, César Gallo-Salazar, Carlos Puente, Francisco Areces, Juan José Salinero, Juan Del Coso
BACKGROUND: Sodium (Na(+)) intake during exercise aims to replace the Na(+) lost by sweat to avoid electrolyte imbalances, especially in endurance disciplines. However, Na(+) needs can be very different among individuals because of the great inter-individual variability in sweat electrolyte concentration. The aim of this investigation was to determine sweat electrolyte concentration in a large group of marathoners. METHODS: A total of 157 experienced runners (141 men and 16 women) completed a marathon race (24...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27468258/post-exercise-branched-chain-amino-acid-supplementation-does-not-affect-recovery-markers-following-three-consecutive-high-intensity-resistance-training-bouts-compared-to-carbohydrate-supplementation
#12
Wesley C Kephart, Petey W Mumford, Anna E McCloskey, A Maleah Holland, Joshua J Shake, C Brooks Mobley, Adam E Jagodinsky, Wendi H Weimar, Gretchen D Oliver, Kaelin C Young, Jordan R Moon, Michael D Roberts
BACKGROUND: Amino acid supplementation has been shown to potentially reduced exercise-induced muscle soreness. Thus, the purpose of this study was to examine if branched chain amino acid and carbohydrate (BCAACHO) versus carbohydrate-only sports drink (CHO) supplementation attenuated markers of muscle damage while preserving performance markers following 3 days of intense weight training. METHODS: Healthy resistance-trained males (n = 30) performed preliminary testing (T1) whereby they: 1) donated a baseline blood draw, 2) performed knee extensor dynamometry to obtain peak quadriceps isometric and isokinetic torque as well as electromyography (EMG) activity at 60°/s and 120°/s, and 3) performed a one repetition maximum (1RM) barbell back squat...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27429596/the-effect-of-acute-pre-workout-supplementation-on-power-and-strength-performance
#13
Nic Martinez, Bill Campbell, Madison Franek, Laura Buchanan, Ryan Colquhoun
BACKGROUND: Consumption of pre-workout dietary supplements by both recreational and competitive athletes has increased dramatically in recent years. The purpose of this study was to determine the acute effects of a caffeine-containing pre-workout dietary supplement on various measures of performance including anaerobic power, upper and lower body power, and upper body strength in recreationally trained males. METHODS: Thirteen males (mean ± SD age = 24 ± 6 yrs; height = 180...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27418883/branched-chain-amino-acids-arginine-citrulline-alleviate-central-fatigue-after-3-simulated-matches-in-taekwondo-athletes-a-randomized-controlled-trial
#14
I-Fan Chen, Huey-June Wu, Chung-Yu Chen, Kuei-Ming Chou, Chen-Kang Chang
BACKGROUND: The decline in cognitive performance has been shown after fatiguing exercise. Branched-chain amino acids (BCAA) have been suggested to alleviate exercise-induced central fatigue. Arginine and citrulline could remove the excess NH3 accumulation accompanied with BCAA supplementation by increasing nitric oxide biosynthesis and/or urea cycle. The purpose of this study is to investigate the effect of the combined supplementation of BCAA, arginine, and citrulline on central fatigue after three simulated matches in well-trained taekwondo athletes...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27408608/a-systematic-review-and-meta-analysis-of-carbohydrate-benefits-associated-with-randomized-controlled-competition-based-performance-trials
#15
Martin Pöchmüller, Lukas Schwingshackl, Paolo C Colombani, Georg Hoffmann
BACKGROUND: Carbohydrate supplements are widely used by athletes as an ergogenic aid before and during sports events. The present systematic review and meta-analysis aimed at synthesizing all available data from randomized controlled trials performed under real-life conditions. METHODS: MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Trials were searched systematically up to February 2015. Study groups were categorized according to test mode and type of performance measurement...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27366132/effects-of-thirty-and-sixty-minutes-of-moderate-intensity-aerobic-exercise-on-postprandial-lipemia-and-inflammation-in-overweight-men-a-randomized-cross-over-study
#16
Sam R Emerson, Stephanie P Kurti, Brian S Snyder, Karthikeyan Sitaraman, Mark D Haub, Sara K Rosenkranz
BACKGROUND: The transient rise in blood lipids following a high-fat meal (HFM), known as postprandial lipemia, is linked to systemic inflammation and cardiovascular disease, but can be blunted by exercise. However, minimal research has investigated the effects of realistic exercise bouts on postprandial lipemia and inflammation in at-risk individuals. The purpose of this study was to assess the effects of moderate-intensity aerobic exercise lasting 30 or 60 min performed the evening before a HFM, on postprandial lipemia and inflammation in overweight, insufficiently active men...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27293386/twelve-weeks-supplementation-with-an-extended-release-caffeine-and-atp-enhancing-supplement-may-improve-body-composition-without-affecting-hematology-in-resistance-trained-men
#17
Jordan M Joy, Roxanne M Vogel, Jordan R Moon, Paul H Falcone, Matt M Mosman, Michael P Kim
BACKGROUND: Increased ATP levels may enhance training-induced muscle accretion and fat loss, and caffeine is a known ergogenic aid. A novel supplement containing ancient peat and apple extracts has reported enhanced mitochondrial ATP production and it has been coupled with an extended-release caffeine. Therefore, the purpose of this investigation was to determine the effects of this supplement on body composition when used in conjunction with 12 weeks of resistance training. METHODS: Twenty-one resistance-trained subjects (27...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27274715/the-effects-of-phosphatidic-acid-supplementation-on-strength-body-composition-muscular-endurance-power-agility-and-vertical-jump-in-resistance-trained-men
#18
Guillermo Escalante, Michelle Alencar, Bryan Haddock, Phillip Harvey
BACKGROUND: Phosphatidic acid (PA) is a lipid messenger that has been shown to increase muscle protein synthesis via signaling stimulation of the mammalian target of rapamycin (mTOR). MaxxTOR® (MT) is a supplement that contains PA as the main active ingredient but also contains other synergistic mTOR signaling substances including L-Leucine, Beta-Hydroxy-Beta-Methylbutyrate (HMB), and Vitamin D3. METHODS: Eighteen healthy strength-trained males were randomly assigned to a group that either consumed MT (n = 8, 22...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27247543/diving-response-after-a-one-week-diet-and-overnight-fasting
#19
Giovanna Ghiani, Elisabetta Marongiu, Sergio Olla, Marco Pinna, Matteo Pusceddu, Girolamo Palazzolo, Irene Sanna, Silvana Roberto, Antonio Crisafulli, Filippo Tocco
BACKGROUND: We hypothesized that overnight fasting after a short dietary period, especially with carbohydrates, could allow performing breath-hold diving with no restraint for diaphragm excursion and blood shift and without any increase of metabolism, and in turn improve the diving response. METHODS: During two separate sessions, 8 divers carried out two trials: (A) a 30-m depth dive, three hours after a normal breakfast and (B) a dive to the same depth, but after following a diet and fasting overnight...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27231439/effects-of-powdered-montmorency-tart-cherry-supplementation-on-acute-endurance-exercise-performance-in-aerobically-trained-individuals
#20
Kyle Levers, Ryan Dalton, Elfego Galvan, Abigail O'Connor, Chelsea Goodenough, Sunday Simbo, Susanne U Mertens-Talcott, Christopher Rasmussen, Mike Greenwood, Steven Riechman, Stephen Crouse, Richard B Kreider
BACKGROUND: The purpose of this study was to determine whether short-term supplementation of a powdered tart cherry supplement prior to and following stressful endurance exercise would affect markers of muscle damage, inflammation, oxidative stress, and/or muscle soreness. METHODS: 27 endurance-trained runners or triathlete (21.8 ± 3.9 years, 15.0 ± 6.0 % body fat, 67.4 ± 11.8 kg) men (n = 18) and women (n = 9) were matched based on average reported race pace, age, body mass, and fat free mass...
2016: Journal of the International Society of Sports Nutrition
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