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https://www.readbyqxmd.com/read/28934166/is-branched-chain-amino-acids-supplementation-an-efficient-nutritional-strategy-to-alleviate-skeletal-muscle-damage-a-systematic-review
#1
REVIEW
Alexandre Fouré, David Bendahan
Amino acids and more precisely, branched-chain amino acids (BCAAs), are usually consumed as nutritional supplements by many athletes and people involved in regular and moderate physical activities regardless of their practice level. BCAAs have been initially shown to increase muscle mass and have also been implicated in the limitation of structural and metabolic alterations associated with exercise damage. This systematic review provides a comprehensive analysis of the literature regarding the beneficial effects of BCAAs supplementation within the context of exercise-induced muscle damage or muscle injury...
September 21, 2017: Nutrients
https://www.readbyqxmd.com/read/28933713/adaptations-associated-with-an-after-school-strength-and-conditioning-program-in-middle-school-aged-boys-a-quasi-experimental-design
#2
Brennan J Thompson, Matt S Stock, Jacob A Mota, Alexander S Drusch, Ryan N DeFranco, Tyler R Cook, Matthew A Hamm
Thompson, BJ, Stock, MS, Mota, JA, Drusch, AS, DeFranco, RN, Cook, TR, and Hamm, MA. Adaptations associated with an after-school strength and conditioning program in middle-school aged boys: a quasi-experimental design. J Strength Cond Res 31(10): 2840-2851, 2017-High-intensity strength and conditioning programs aimed at improving youth performance are becoming increasingly prevalent. The purpose of this study was to investigate the effects of a 16-week after-school strength and conditioning program on performance and body composition in middle-school-aged boys...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28933711/the-effect-of-hip-joint-angle-on-isometric-midthigh-pull-kinetics
#3
Thomas DosʼSantos, Christopher Thomas, Paul A Jones, John J McMahon, Paul Comfort
Dos'Santos, T, Thomas, C, Jones, PA, McMahon, JJ, and Comfort, P. The effect of hip joint angle on isometric midthigh pull kinetics. J Strength Cond Res 31(10): 2748-2757, 2017-The aim of this study were to compare isometric midthigh pull (IMTP) peak force (PF), time-specific force values (100-, 150-, and 200 ms), rate of force development (RFD) at predetermined time bands (0-100, 0-150, and 0-200 ms) and net forces between 2 commonly adopted hip joint angles (145°[hip145] and 175°[hip175]) with a 145° standardized knee angle...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28933024/effects-of-rest-interval-duration-in-resistance-training-on-measures-of-muscular-strength-a-systematic-review
#4
REVIEW
Jozo Grgic, Brad J Schoenfeld, Mislav Skrepnik, Timothy B Davies, Pavle Mikulic
BACKGROUND: Rest interval (RI) duration is an important resistance-training variable underlying gain in muscular strength. Recommendations for optimal RI duration for gains in muscular strength are largely inferred from studies examining the acute resistance training effects, and the generalizability of such findings to chronic adaptations is uncertain. OBJECTIVE: The goals of this systematic literature review are: (i) to aggregate findings and interpret the studies that assessed chronic muscular strength adaptations to resistance training interventions involving different RI durations, and (ii) to provide evidence-based recommendations for exercise practitioners and athletes...
September 20, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28932159/the-use-of-performance-enhancing-substances-doping-by-athletes-in-saudi-arabia
#5
Mohammed Al Ghobain
BACKGROUND: Data on doping violation in Saudi Arabia are scarce. Our aim was to investigate the Saudi experience of anti-doping and review all positive samples and adverse analytical findings (AAFs) of Saudi athletes. MATERIALS AND METHODS: This study analyzed databases of the Saudi Arabian Anti-Doping Committee from 2008 to May 2016. The samples originated from various sporting events and were collected in and outside sport competitions. The substances investigated were those included in the annual lists of prohibited substances produced by the World Anti-Doping Agency (WADA)...
September 2017: Journal of Family & Community Medicine
https://www.readbyqxmd.com/read/28931992/knee-injury-and-osteoarthritis-outcome-score-of-korean-national-ice-hockey-players
#6
Hyeyoung Kim, Sujin Hwang, Byoung-Hee Lee
[Purpose] To investigate sports injuries in Korean national ice hockey players by surveying parts, times, types, frequency, cure, and prevention types of sports injuries and provide basic data for injury prevention and performance improvement of ice hockey players. Another purpose of this study was to evaluate the incidence of ice hockey injuries according to age and the relationship between etiological factors and injuries in high school students. [Subjects and Methods] This was a cross-sectional study. Eighteen female ice hockey players in Korean elite athletes were recruited for this study...
September 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28931975/correlation-between-sleep-and-psychological-mood-states-in-female-wheelchair-basketball-players-on-a-japanese-national-team
#7
Kenji Tsunoda, Hirotaka Mutsuzaki, Kazushi Hotta, Yukiyo Shimizu, Naruki Kitano, Yasuyoshi Wadano
[Purpose] Although some studies suggest the importance of getting adequate sleep for enhancing mood, there is not yet sufficient evidence on the relationship between sleep and mood states in athletes, especially for athletes with physical disability. The purpose of this study is to reveal relationships between sleep and psychological mood states in female wheelchair basketball players. [Subjects and Methods] Seventeen female wheelchair basketball players (30.9 ± 9.4 years old) on a Japanese national team participated...
September 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28930932/complex-training-the-effect-of-exercise-selection-and-training-status-on-postactivation-potentiation-in-rugby-league-players
#8
David J Scott, Massimiliano Ditroilo, Phil A Marshall
Scott, DJ, Ditroilo, M, and Marshall, PA. Complex training: the effect of exercise selection and training status on postactivation potentiation in rugby league players. J Strength Cond Res 31(10): 2694-2703, 2017-This study compared the postactivation potentiation (PAP) response of the hex bar deadlift (HBD) and back squat (BS) exercises. The PAP response between different levels of athletes was also compared. Ten professional and 10 amateur rugby league players performed 2 experimental sessions. Participants performed a countermovement jump (CMJ) before and 2, 4, 6, 8, 10, 12, 14, and 16 minutes after a conditioning activity (CA) that contained 1 set of 3 repetitions at 93% 1 repetition maximum of either HBD or BS...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930879/repeat-effort-performance-is-reduced-24-h-following-acute-dehydration-in-mixed-martial-arts-athletes
#9
Oliver R Barley, Fiona Iredale, Dale W Chapman, Amanda Hopper, Chris Abbiss
This study sought to determine the influence of acute dehydration on physical performance and physiology in Mixed Martial Arts (MMA). MMA athletes (n=14; age: 23±4 years), completed in a randomised counterbalanced order a dehydration protocol, (DHY: 3 h cycling at 60 W in 40°C to induce 5% dehydration) or thermoneutral control (25°C: CONT) exercise, followed by ad libitum fluid/food intake. Performance testing (a repeat sled push test, medicine ball chest throw and vertical jump) was completed 3 and 24 h following the intervention, while urine and blood samples were collected before, 20 min, 3 and 24 h following the intervention...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930878/performance-of-future-elite-players-at-the-nfl-scouting-combine
#10
David P Hedlund
The purpose of this study is to examine players' physical and performance measures taken at the NFL Scouting Combine and compare these to their future performance in the NFL. From 2002-2016, three types of player data (N=5,506) were collected from secondary data sources. Results players earned on various NFL Scouting Combine drills and measurements (e.g., height, weight, 40-yard dash time, vertical jump, bench press repetitions, shuttle run time, and 3-cone drill time), the position players play on the field (e...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930875/the-kinetic-determinants-of-reactive-strength-in-highly-trained-sprint-athletes
#11
Jamie Douglas, Simon Pearson, Angus Ross, Mike McGuigan
The purpose of this study was to determine the braking and propulsive phase kinetic variables underpinning reactive strength in highly trained sprint athletes in comparison to a non-sprint trained control group. Twelve highly trained sprint athletes and twelve non-sprint trained participants performed drop jumps (DJs) from 0.25m, 0.50m and 0.75m onto a force plate. One familiarization session was followed by an experimental testing session within the same week. Reactive strength index (RSI), contact time, flight time, and leg stiffness were determined...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930873/preseason-functional-test-scores-are-associated-with-future-sports-injury-in-female-collegiate-athletes
#12
Jason Brumitt, Bryan Heiderscheit, Robert Manske, Paul E Niemuth, Alma Mattocks, Mitchell J Rauh
Recent prospective cohort studies have reported preseason functional performance test (FPT) measures and associations with future risk of injury; however, the findings associated with these studies have been equivocal. The purpose of this study was to determine the ability of a battery of FPTs as a preseason screening tool to identify female Division III (D III) collegiate athletes who may be at risk for a non-contact time-loss injury to the lower quadrant [LQ = low back and lower extremities]. One hundred six female D III athletes were recruited for this study...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930872/improving-vertical-jump-profiles-through-prescribed-movement-plans
#13
John K Mayberry, Bryce Patterson, Phil Wagner
Developing practical, reliable, and valid methods for monitoring athlete wellness and injury risk is an important goal for trainers, athletes, and coaches. Previous studies have shown that the countermovement vertical jump test (CMJ) is both a reliable and valid metric for evaluating an athlete's condition. This study examines the effectiveness of prescribed workouts on improving quality of movement during CMJ. The dataset consists of 2425 pairs of CMJ scans for high school, college, and professional athletes training at a privately owned facility...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28929936/time-course-of-the-acute-effects-of-core-stabilisation-exercise-on-seated-postural-control
#14
Jordan B Lee, Stephen H M Brown
Core stabilisation exercises are often promoted for purposes ranging from general fitness to high-performance athletics, and the prevention and rehabilitation of back troubles. These exercises, when performed properly, may have the potential to enhance torso postural awareness and control, yet the potential for achieving immediate gains has not been completely studied. Fourteen healthy young participants performed a single bout of non-fatiguing core stabilisation exercise that consisted of repeated sets of 2 isometric exercises, the side bridge and the four-point contralateral arm-and-leg extension...
September 20, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28927669/are-the-hamstrings-from-the-drive-leg-or-landing-leg-more-active-in-baseball-pitchers-an-electromyographic-study
#15
Brandon J Erickson, Antonia Zaferiou, Peter N Chalmers, Deana Ruby, Phillip Malloy, Timothy J Luchetti, Nikhil N Verma, Anthony A Romeo
BACKGROUND: Ulnar collateral ligament reconstruction (UCLR) has become a common procedure among baseball players of all levels. There are several graft choices in performing UCLR, one of which is a hamstring (gracilis or semitendinosus) autograft. It is unclear whether the hamstring muscle from a pitcher's drive leg (ipsilateral side of the UCLR) or landing leg (contralateral side of the UCLR) is more active during the pitching motion. We hypothesized that the landing leg semitendinosus will be more electromyographically active than the drive leg...
September 15, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28924423/vegan-diets-practical-advice-for-athletes-and-exercisers
#16
REVIEW
David Rogerson
With the growth of social media as a platform to share information, veganism is becoming more visible, and could be becoming more accepted in sports and in the health and fitness industry. However, to date, there appears to be a lack of literature that discusses how to manage vegan diets for athletic purposes. This article attempted to review literature in order to provide recommendations for how to construct a vegan diet for athletes and exercisers. While little data could be found in the sports nutrition literature specifically, it was revealed elsewhere that veganism creates challenges that need to be accounted for when designing a nutritious diet...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28922211/acute-effects-of-ammonia-inhalants-on-strength-and-power-performance-in-trained-men
#17
Sandro Bartolomei, Federico Nigro, Gubellini Luca, Semprini Gabriele, Simone Ciacci, Jay R Hoffman, Franco Merni
The aim of the present study was to investigate the influence of ammonia inhalants on lower body power and maximal isometric strength in trained men. Twenty experienced resistance trained men (age = 26.7 ± 3.7 y; body weight = 80.59 ± 9.0 kg; body height = 179.5 ± 5.7 cm) were tested for counter movement jump power (CMJP), maximal force and rate of force development (pRFD20) expressed during an isometric mid-thigh pull (IMTP). Assessments were performed using either an ammonia salt inhalants (AI), a placebo (PL) or no inhalants (N)...
September 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28922090/microsaccades-and-interest-areas-during-free-viewing-sport-task
#18
Alessandro Piras, Milena Raffi, Monica Perazzolo, Ivan Malagoli Lanzoni, Salvatore Squatrito
Microsaccades are important fixation eye movements for visual scene perception. Compared to novices, athletes make fewer fixations of longer duration toward limited interest areas crucial for action prediction. Thus, our aim was to study the microsaccade features during those fixations. Gaze behaviour of expert and novice table tennis players was recorder during a task in which subjects were instructed to predict the direction of the ball after the opponent's throw. Three interest areas from the opponent's body and one from the ball trajectory were identified...
September 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28921722/interactive-effects-of-music-tempi-and-intensities-on-grip-strength-and-subjective-affect
#19
Costas I Karageorghis, Peter Cheek, Stuart D Simpson, Marcelo Bigliassi
Pretask music is widely used by athletes albeit there is scant empirical evidence to support its use. The present study extended a line of work into pretask music by examining the interactive effects of music tempo and intensity (volume) on the performance of a simple motor skill and subjective affect. A 2 × 2 within-subjects factorial design was employed with an additional no-music control, the scores from which were used as a covariate. A sample of 52 male athletes (age = 26.1 ± 4.8 years) was exposed to five conditions: fast/loud (126 bpm/80 dBA), fast/quiet (126 bpm/70 dBA), slow/loud (87 bpm/80 dBA), slow/quiet (87 bpm/70 dBA) music, and a no-music control...
September 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28920556/the-effects-of-limb-dominance-and-a-short-term-high-intensity-exercise-protocol-on-both-landings-of-the-vertical-drop-jump-implications-for-the-vertical-drop-jump-as-a-screening-tool
#20
Enda F Whyte, Patrick Kennelly, Oliver Milton, Chris Richter, Siobhán O'Connor, Kieran A Moran
The effectiveness of vertical drop jumps (VDJs) to screen for non-contact ACL injuries is unclear. This may be contributed to by discrete point analysis, which does not evaluate patterns of movement. Also, limited research exists on the second landing of VDJs, potential lower limb performance asymmetries and the effect of fatigue. Statistical parametric mapping investigated the main effects of landing, limb dominance and a high intensity, intermittent exercise protocol (HIIP) on VDJ biomechanics. Twenty-two male athletes (21...
September 18, 2017: Sports Biomechanics
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