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https://www.readbyqxmd.com/read/29431546/the-trainability-of-adolescent-soccer-players-to-brief-periodized-complex-training
#1
Athanasios Chatzinikolaou, Konstantinos Michaloglou, Alexandra Avloniti, Diamanda Leontsini, Chariklia K Deli, Dimitris Vlachopoulos, Luis Gracia-Marco, Sotirios Arsenis, Ioannis Athanailidis, Dimitrios Draganidis, Athanasios Z Jamurtas, Craig A Williams, Ioannis G Fatouros
PURPOSE: Τo investigate the effect of a complex, short-term strength/power training protocol on performance and body composition of elite early-adolescent soccer players. METHODS: Twenty-two players (14-15 years) were randomly assigned to (a) an experimental (EG, n=12, participated in a 5-week training protocol with traditional multi-joint power resistance exercises, Olympic-style lifts, plyometric drills and speed work, four times/week) or (b) a control group (CG, n=10)...
February 12, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29394200/effect-of-a-short-term-cycle-ergometer-sprint-training-against-heavy-and-light-resistances-on-intraocular-pressure-responses
#2
Jesús Vera, Amador Garcia-Ramos, Beatriz Redondo, David Cárdenas, Carlos Gustavo De Moraes, Raimundo Jiménez
PURPOSE: To determinate the long-term effect of a cycle ergometer sprint training program against heavy and light resistances on baseline intraocular pressure (IOP), and on the acute IOP response to cycling sprints. METHODS: Twenty-seven physically active males were randomly assigned to a heavy loads group (HLG, n=9), low loads group (LLG, n=9), and control group (CG, n=9). Participants performed 12 training sessions during 6 weeks (2 sessions per week), and each training session consisted in performing eight cycling sprints against either heavy (HLG) or light (LLG) resistances...
February 1, 2018: Journal of Glaucoma
https://www.readbyqxmd.com/read/29385007/alcohol-after-resistance-exercise-does-not-affect-muscle-power-recovery
#3
Danielle E Levitt, Nosakhare O Idemudia, Carianne M Cregar, Anthony A Duplanty, David W Hill, Jakob L Vingren
The purpose of this study was to investigate the effect of alcohol consumed after heavy eccentric resistance exercise on measures of muscle power. After familiarization and an initial eccentric exercise bout to control for the "repeated-bout effect," ten recreationally resistance-trained men completed two identical heavy eccentric squat bouts (4 sets of 10 repetitions at 110% of concentric 1-repetition maximum) one week apart. Each exercise bout was followed by ingestion of a beverage containing either alcohol (1...
January 29, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29378227/the-effect-of-acute-and-chronic-exercise-on-steroid-hormone-fluctuations-in-young-and-middle-aged-men
#4
Maha Sellami, Wissem Dhahbi, Lawrence D Hayes, Goran Kuvacic, Mirjana Milic, Johnny Padulo
The current study examine the effects of combined sprint and resistance training on serum total testosterone (TT), sex-hormone-binding globulin (SHBG) and cortisol (C), at rest, and in response to the Wingate Anaerobic-Test (WAnT) in 21 and 41years old men. Forty moderately-trained men were randomly assigned to a young trained (YT), young control (YC), middle-aged trained (MAT), and middle-aged control (MAC) group. Before (P1), and after (P2) training, blood samples were collected at rest and after exercise...
January 25, 2018: Steroids
https://www.readbyqxmd.com/read/29368182/administration-of-caffeine-in-alternate-forms
#5
REVIEW
Kate A Wickham, Lawrence L Spriet
There has been recent interest in the ergogenic effects of caffeine delivered in low doses (~ 200 mg or ~ 3 mg/kg body mass) and administered in forms other than capsules, coffee and sports drinks, including chewing gum, bars, gels, mouth rinses, energy drinks and aerosols. Caffeinated chewing gum is absorbed quicker through the buccal mucosa compared with capsule delivery and absorption in the gut, although total caffeine absorption over time is not different. Rapid absorption may be important in many sporting situations...
January 24, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29350110/construct-validity-of-the-resistance-training-skills-battery-in-children-aged-7-10-years
#6
Michael J Duncan, Chelsey Lawson, Josh Hurst, Jason Tallis, Victoria Jones, Emma L J Eyre
The current study sought to examine the construct validity of the Resistance Training Skills Battery for Children (RTSBc), a movement screen purported to assess resistance training skill in children. Children aged 7-10 years (n = 27, 21 males, 6 females) undertook measures of resistance training skill via the RTSBc, motor competence and muscular fitness. Using a median split for RTSBc scores, children were categorised as high or low resistance training competence. Univariate ANCOVAs, controlling for maturation, were used to examine whether measures of muscular fitness and motor competence scores differed as a function of RTSBc competence...
January 19, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29339993/functional-and-muscle-size-effects-of-flywheel-resistance-training-with-eccentric-overload-in-professional-handball-players
#7
Sergio Maroto-Izquierdo, David García-López, José A de Paz
The aim of the study was to analyse the effects of 6 week (15 sessions) flywheel resistance training with eccentric-overload (FRTEO) on different functional and anatomical variables in professional handball players. Twenty-nine athletes were recruited and randomly divided into two groups. The experimental group (EXP, n = 15) carried out 15 sessions of FRTEO in the leg-press exercise, with 4 sets of 7 repetitions at a maximum-concentric effort. The control group (CON, n = 14) performed the same number of training sessions including 4 sets of 7 maximum repetitions (7RM) using a weight-stack leg-press machine...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29339985/butterfly-sprint-swimming-technique-analysis-of-somatic-and-spatial-temporal-coordination-variables
#8
Marek Strzała, Arkadiusz Stanula, Piotr Krężałek, Andrzej Ostrowski, Marcin Kaca, Grzegorz Głąb
The aim of this study was to investigate somatic properties and force production of leg extensor muscles measured in the countermovement jump test (CMJ), as well as to analyse kinematic variables of sprint surface butterfly swimming. Thirty-four male competitive swimmers were recruited with an average age of 19.3 ± 1.83 years. Their average body height (BH) was 183.7 ± 5.93 cm, body fat content 10.8 ± 2.64% and body mass (BM) 78.3 ± 5.0 kg. Length measurements of particular body segments were taken and a counter movement jump (CMJ) as well as an all-out 50 m butterfly speed test were completed...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29337831/the-acute-effects-of-a-caffeine-containing-supplement-on-anaerobic-power-and-subjective-measurements-of-fatigue-in-recreationally-active-males
#9
Chelsea J Hahn, Andrew R Jagim, Clayton L Camic, Matthew J Andre
Studies show mixed results for the effects of caffeine on performance, warranting further investigation. The purpose of this study was to examine the acute effects of a caffeine-containing supplement on anaerobic power and subjective measurements of fatigue during resisted sprinting on males. Fourteen recreationally-active males [N=14; (mean±SD), age: 21.0±0.7 yrs., height: 178.5±5.1 cm, weight: 77.3±9.6 kg, percent body fat: 12.6±4.8%] participated in a double-blind, placebo controlled, within-subjects crossover design study...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29334309/effects-of-resisted-sprint-training-on-sprinting-ability-and-change-of-direction-speed-in-professional-soccer-players
#10
Saulo Gil, Renato Barroso, Everton Crivoi do Carmo, Irineu Loturco, Ronaldo Kobal, Valmor Tricoli, Carlos Ugrinowitsch, Hamilton Roschel
Resisted sprint training consists of performing overloaded sprints, which may produce greater effects than traditional sprint training. We compared a resisted sprint training with overload control versus an unresisted sprint training program on performance in soccer players. Eighteen elite athletes were randomly assigned to resisted (RST) or unresisted sprint training protocol (UR). Before and after a 6-week training period, sprinting ability, change of direction speed (COD), vertical jumps (SJ and CMJ), mean power (MP) and mean propulsive power (MPP) at distinct loads were assessed...
January 15, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29324580/the-relationship-between-skating-economy-and-performance-during-a-repeated-shift-test-in-elite-and-sub-elite-ice-hockey-players
#11
Nicholas R Lamoureux, Grant R Tomkinson, Benjamin J Peterson, John S Fitzgerald
The purpose of this study was to determine the importance of skating economy to fatigue during repeated high-intensity efforts of a simulated ice hockey shift. Forty-five collegiate and Junior A male ice hockey players (aged 18-24 years) performed a continuous graded exercise test using a skate treadmill. Breath-by-breath data for oxygen consumption (V[Combining Dot Above]O2) and respiratory exchange ratio were collected and used to derive energy expenditure (EE) averaged over the final 10 seconds of each stage...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29315164/effects-of-strength-training-on-postpubertal-adolescent-distance-runners
#12
Richard C Blagrove, Louis P Howe, Emily J Cushion, Adam Spence, Glyn Howatson, Charles R Pedlar, Philip R Hayes
PURPOSE: Strength training activities have consistently been shown to improve running economy (RE) and neuromuscular characteristics, such as force producing ability and maximal speed, in adult distance runners. However the effects on adolescent (<18 years) runners remains elusive. This randomized control trial aimed to examine the effect of strength training on several important physiological and neuromuscular qualities associated with distance running performance. METHODS: Participants (n=25, 13 female, 17...
January 8, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29302753/a-comparison-between-the-force-velocity-relationships-of-unloaded-and-sled-resisted-sprinting-single-vs-multiple-trial-methods
#13
Matt R Cross, Pierre Samozino, Scott R Brown, Jean-Benoît Morin
PURPOSE: We sought to compare force-velocity relationships developed from unloaded sprinting acceleration to that compiled from multiple sled-resisted sprints. METHODS: Twenty-seven mixed-code athletes performed six to seven maximal sprints, unloaded and towing a sled (20-120% of body-mass), while measured using a sports radar. Two methods were used to draw force-velocity relationships for each athlete: A multiple trial method compiling kinetic data using pre-determined friction coefficients and aerodynamic drag at maximum velocity from each sprint; and a validated single trial method plotting external force due to acceleration and aerodynamic drag and velocity throughout an acceleration phase of an unloaded sprint (only)...
January 4, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29300979/high-intensity-exercise-decreases-ip6k1-muscle-content-improves-insulin-sensitivity-si2-in-glucose-intolerant-individuals
#14
Jane Naufahu, Bradley Elliott, Anatoliy Markiv, Petra Dunning-Foreman, Maggie McGrady, David Howard, Peter Watt, Richard W A Mackenzie
Context: Insulin resistance in skeletal muscle contributes to whole body hyperglycaemia and the secondary complications associated with type 2 diabetes. Inositol hexakisphosphate kinase-1 (IP6K1) may inhibit insulin-stimulated glucose transport in this tissue type. Objective: Muscle and plasma IP6K1 were correlated with two-compartment models of glucose control in insulin-resistant hyperinsulimic individuals. Muscle IP6K1 was also compared following two different exercise trials...
December 29, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29249083/effects-of-strength-training-on-the-physiological-determinants-of-middle-and-long-distance-running-performance-a-systematic-review
#15
REVIEW
Richard C Blagrove, Glyn Howatson, Philip R Hayes
BACKGROUND: Middle- and long-distance running performance is constrained by several important aerobic and anaerobic parameters. The efficacy of strength training (ST) for distance runners has received considerable attention in the literature. However, to date, the results of these studies have not been fully synthesized in a review on the topic. OBJECTIVES: This systematic review aimed to provide a comprehensive critical commentary on the current literature that has examined the effects of ST modalities on the physiological determinants and performance of middle- and long-distance runners, and offer recommendations for best practice...
December 16, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29183220/the-effect-of-low-volume-sprint-interval-training-in-patients-with-non-alcoholic-fatty-liver-disease
#16
Catriona MacLean, John Dillon, John A Babraj, Niels Bj Vollaard
OBJECTIVES: Exercise is an important part of disease management in patients with non-alcoholic fatty liver disease (NAFLD), but adherence to current exercise recommendations is poor. Novel low-volume sprint interval training (SIT) protocols with total training time commitments of ≤30 min per week have been shown to improve cardiometabolic risk and functional capacity in healthy sedentary participants, but the efficacy of such protocols in the management of NAFLD remains unknown. The aim of the present study was to examine whether a low-volume SIT protocol can be used to improve liver function, insulin resistance, body composition, physical fitness, cognitive function and general well-being in patients with NAFLD...
December 1, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29112051/a-comparison-of-the-effects-of-short-term-plyometric-and-resistance-training-on-lower-body-muscular-performance
#17
Malcolm T Whitehead, Timothy P Scheett, Michael R McGuigan, N Z Auckland, Angel V Martin
The purpose of this study was to compare effects of short-term plyometric and resistance training on lower body muscular performance. A convenience sample of thirty males aged 21.3 ± 1.8 years, height 177.3 ± 9.4 cm, mass 80.0 ± 2.6 kg, body fat 16.1 ± 1.2 % participated in this investigation. Participants were grouped and participated in progressive plyometric (PLT) or resistance training (SRT) twice per week for eight consecutive weeks or a control (CNT) group that did not participate in any training...
November 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29106812/whey-protein-hydrolysate-supplementation-accelerates-recovery-from-exercise-induced-muscle-damage-in-females
#18
Meghan A Brown, Emma J Stevenson, Glyn Howatson
A number of different forms of protein and their analogues have been investigated for their efficacy in ameliorating exercise-induced muscle damage (EIMD) and recovery. Preliminary data regarding whey protein hydrolysate (WPH) supplementation are promising. However, its efficacy beyond acute eccentric/resistance exercise bouts or longer-term training programmes are limited and all investigations have been conducted in male or mixed-sex groups. This study sought to elucidate whether the benefits of WPH previously reported can be demonstrated in females following repeated-sprint exercise...
November 6, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29091137/correlation-between-the-bactec-mgit-960-culture-system-with-genotype-mtbdrplus-and-tb-sprint-in-multidrug-resistant-mycobacterium-tuberculosis-clinical-isolates-from-brazil
#19
Nayanne Gama Teixeira Dantas, Phillip Noel Suffys, Wânia da Silva Carvalho, Harrison Magdinier Gomes, Isabela Neves de Almeida, Lida Jouca de Assis Figueiredo, Alan Douglas Gonçalves, Michel Kireopori Gomgnimbou, Guislaine Refregier, Christophe Sola, Silvana Spíndola de Miranda
BACKGROUND: The accurate detection of multidrug-resistant tuberculosis (MDR-TB) is critical for the application of appropriate patient treatment and prevention of transmission of drug-resistant Mycobacterium tuberculosis isolates. The goal of this study was to evaluate the correlation between phenotypic and molecular techniques for drug-resistant tuberculosis diagnostics. Molecular techniques used were the line probe assay genotype MTBDRplus and the recently described tuberculosis-spoligo-rifampin-isoniazid typing (TB-SPRINT) bead-based assay...
November 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29084097/differential-effects-of-different-warm-up-protocols-on-repeated-sprints-induced-muscle-damage
#20
Che-Hsiu Chen, Xin Ye, Yi-Tse Wang, Yung-Sheng Chen, Wei-Chin Tseng
The purpose of this investigation was to examine whether adding a set of hamstring resistance exercise or dynamic stretching to a regular running-based warm-up before a bout of repeated sprints provides protective effects against the sprinting-induced muscle damage. Twelve elite tennis players participated in this study. After the familiarization, subjects completed 3 separate randomly sequenced experimental visits, during which 3 different warm-up interventions were performed before the muscle-damaging protocol (12 sets of 30-m maximal repeated sprints): 5 minutes of running (control); control with single leg slide curl (SLC); and control with active hamstring stretching (AHS)...
October 27, 2017: Journal of Strength and Conditioning Research
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