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Journal of Sports Science & Medicine

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https://www.readbyqxmd.com/read/29238263/sleep-wake-behaviours-in-elite-athletes-from-three-different-football-codes
#1
Dean J Miller, Charli Sargent, Grace E Vincent, Gregory D Roach, Shona L Halson, Michele Lastella
No abstract text is available yet for this article.
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238262/effect-of-upper-extremity-strengthening-exercises-on-the-lumbar-strength-disability-and-pain-of-patients-with-chronic-low-back-pain-a-randomized-controlled-study
#2
Erdem Atalay, Bedrettin Akova, Hakan Gür, Ufuk Sekir
The present study aimed to analyze the impacts of a low back rehabilitation program accompanied with neck, shoulder and upper back exercises on pain, disability, and physical characteristics of patients with chronic low back pain. Twenty sedentary male patients with chronic low back pain participated in the study on a voluntary basis. The patients were randomly allocated into two groups: a conventional low back exercise group (CE) and a supported exercise group (SE; CE plus upper back, neck, and shoulder exercises)...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238261/physical-physiological-and-perceptual-match-demands-of-amateur-mixed-gender-touch-players
#3
Will Vickery, Alice Harkness
The purpose of this study was to provide a position specific (middle, link [male], link [female], wing) analysis of mixed gender touch on the physical physiological and perceptual demands of amateur players during match-play across a season. Distance and speed measures were obtained through the use of 10-Hz global positioning system devices, whilst telemetric heart rate devices were used determine a range of physiological measures. Players also provided a rating of perceived exertion following each match. The greatest physical demand was associated with the middle playing position by comparison to all others (Distance travelled ≥5...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238260/the-effect-of-400-%C3%A2%C2%B5g-inhaled-salbutamol-on-3-km-time-trial-performance-in-a-low-humidity-environment
#4
John Molphy, John W Dickinson, Neil J Chester, Mike Loosemore, Gregory Whyte
The Objectives of the study were to investigate whether 400 µg inhaled salbutamol influences 3 km running time-trial performance and lung function in eucapnic voluntary hyperpnoea positive (EVH+ve) and negative (EVH-ve) individuals. Fourteen male participants (22.4 ± 1.6yrs; 76.4 ± 8.7kg; 1.80 ± 0.07 m); (7 EVH+ve; 7 EVH-ve) were recruited following written informed consent. All participants undertook an EVH challenge to identify either EVH+ve (↓FEV1>10%) or EVH-ve (↓FEV1<10%). Participants performed three separate 3 km running time-trials in a low-humidity (20-25%) environment on a non-motorized treadmill, 15 minutes following inhalation of salbutamol (400 µg), placebo (non-active inhalant) or control (no inhalant), in a randomized, single-blind, repeated measures design...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238259/front-crawl-swimming-performance-and-bi-lateral-force-asymmetry-during-land-based-and-tethered-swimming-tests
#5
Karini B Dos Santos, Paulo C Barauce Bento, Gleber Pereira, Carl Payton, André L F Rodacki
The aims of this study were to investigate whether land-based and tethered swimming strength tests can explain swimming performance in 200-meter front crawl and, whether these tests were able to identify bilateral symmetry in force production. In the first session, eighteen swimmers completed a maximum effort 200 m front crawl swim (swimming performance) and 15 seconds maximal effort tethered front crawl swim. In the second session, participants performed the upper extremity isometric strength test. Peak force production of tethered swimming and isometric strength tests were significantly correlated for the strongest and weakest sides (r = 0...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238258/do-red-and-blue-uniforms-matter-in-football-and-handball-penalties
#6
Bjoern Krenn, Niklas Pernhaupt, Markus Handsteiner
Past research has revealed ambiguous results on the impact of red uniforms in sports competition. The current study was aimed at analyzing the role of red and blue uniforms in football and handball penalties. Two experiments were conducted using a within subjects design, where participants rated uniform color-manipulated video clips. In the first study, participants (n = 39) watched footage of football players kicking a penalty, whereas in the second study (n = 118) videos of handball penalty takers, handball goalkeepers and football goalkeepers preparing themselves to score/save a penalty were shown...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238257/validation-of-an-arm-crank-ergometer-test-for-use-in-sedentary-adults
#7
Alexandros Mitropoulos, Anil Gumber, Helen Crank, Markos Klonizakis
The maximal oxygen uptake (V̇O2peak) test is an approved pre-operative examination tool, in a clinical setting: Both V̇O2peak and anaerobic threshold indicate a patient's physiological tolerance for major surgery and post-operative mortality, with cycle ergometry being routinely used for V̇O2peak tests in clinical settings, in many European countries. Nevertheless, the opportunities to assess populations with restricted mobility of the lower limbs are limited, as alternative methods (such as an arm-crank test protocol) to assess V̇O2peak are yet to be established...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238256/the-influence-of-a-pacesetter-on-psychological-responses-and-pacing-behavior-during-a-1600-m-run
#8
Christopher L Fullerton, Andrew M Lane, Tracey J Devonport
This study compared the effects of following a pacer versus following a self-paced plan on psychological responses and pacing behavior in well-trained distance runners. Pacing in the present study was individually tailored where each participant developed a personal strategy to ensure their goal time was achieved. We expected that following a pacer would associate with goal achievement, higher pre-run confidence, positive emotions and lower perceived exertion during performance. In a mixed-design repeated-measures study, nineteen well-trained runners completed two 1600m running time trials...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238255/does-shoe-collar-height-influence-ankle-joint-kinematics-and-kinetics-in-sagittal-plane-maneuvers
#9
Yang Yang, Ying Fang, Xini Zhang, Junliang He, Weijie Fu
The Objective of the study is to investigate the effects of basketball shoes with different collar heights on ankle kinematics and kinetics and athletic performance in different sagittal plane maneuvers. Twelve participants who wore high-top and low-top basketball shoes (hereafter, HS and LS, respectively) performed a weight-bearing dorsiflexion (WB-DF) maneuver, drop jumps (DJs), and lay-up jumps (LJs). Their sagittal plane kinematics and ground reaction forces were recorded using the Vicon motion capture system and Kistler force plates simultaneously...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238254/assessment-of-three-dimensional-trunk-kinematics-and-muscle-activation-during-cycling-with-independent-cranks
#10
Eric Bourdon, Matthew Mavor, Dean C Hay
Independent cranks (IC) are recently introduced bicycle cranks that are decoupled; therefore allowing each leg to pedal independent of the other. Despite this introduction, limited research has been conducted assessing biomechanical changes when cycling with IC. Therefore, the purpose of this study was to evaluate and compare trunk kinematics and surface electromyography (sEMG) during IC and normal crank (NC) cycling during a graded exercise test to volitional fatigue. Ten healthy, physically active men performed two tests (IC and NC) on a cycling ergometer on separate days...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238253/plyometric-training-improves-sprinting-jumping-and-throwing-capacities-of-high-level-female-volleyball-players-better-than-skill-based-conditioning
#11
Bahri Gjinovci, Kemal Idrizovic, Ognjen Uljevic, Damir Sekulic
There is an evident lack of studies on the effectiveness of plyometric- and skill-based-conditioning in volleyball. This study aimed to evaluate effects of 12-week plyometric- and volleyball-skill-based training on specific conditioning abilities in female volleyball players. The sample included 41 high-level female volleyball players (21.8 ± 2.1 years of age; 1.76 ± 0.06 cm; 60.8 ± 7.0 kg), who participated in plyometric- (n = 21), or skill-based-conditioning-program (n = 20). Both programs were performed twice per week...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238252/the-effect-of-respiratory-muscle-training-on-fin-swimmers-performance
#12
Jana Vašíčková, Kateřina Neumannová, Zbyněk Svozil
Although respiratory muscle functions can influence swimming performance, respiratory muscle training (RMT) is not routinely used for improving fin-swimmers´ performance. The aim of our study was to verify the benefit of a one month of RMT in young fin-swimmers. We assessed the effect of this training on respiratory muscles and on maximal underwater swimming distance. 28 fin-swimmers were randomly divided into an experimental group (EG) and a control group (CG). The study finished with 20 fin-swimmers (EG: n = 12; average age 12...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238251/the-acute-effects-of-static-and-cyclic-stretching-on-muscle-stiffness-and-hardness-of-medial-gastrocnemius-muscle
#13
Noriaki Maeda, Yukio Urabe, Shogo Tsutsumi, Shogo Sakai, Hironori Fujishita, Toshiki Kobayashi, Makoto Asaeda, Kazuhiko Hirata, Yukio Mikami, Hiroaki Kimura
This study aimed to clarify the acute effects of static stretching (SS) and cyclic stretching (CS) on muscle stiffness and hardness of the medial gastrocnemius muscle (MG) by using ultrasonography, range of motion (ROM) of the ankle joint and ankle plantar flexor. Twenty healthy men participated in this study. Participants were randomly assigned to SS, CS and control conditions. Each session consisted of a standard 5-minute cycle warm-up, accompanied by one of the subsequent conditions in another day: (a) 2 minutes static stretching, (b) 2 minutes cyclic stretching, (c) control...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238250/influence-of-tennis-racquet-kinematics-on-ball-topspin-angular-velocity-and-accuracy-during-the-forehand-groundstroke
#14
Sunku Kwon, Robin Pfister, Ronald L Hager, Iain Hunter, Matthew K Seeley
Forehand groundstroke effectiveness is important for tennis success. Ball topspin angular velocity (TAV) and accuracy are important for forehand groundstroke effectiveness, and have been extensively studied, previously; despite previous, quality studies, it was unclear whether certain racquet kinematics relate to ball TAV and shot accuracy during the forehand groundstroke. This study evaluated potential relationships between (1) ball TAV and (2) forehand accuracy, and five measures of racquet kinematics: racquet head impact angle (i...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238249/influence-of-competitive-anxiety-on-heart-rate-variability-in-swimmers
#15
Leonardo S Fortes, Bruna D V da Costa, Pedro P Paes, José R A do Nascimento Júnior, Lenamar Fiorese, Maria E C Ferreira
The aim of this study was to analyze the relationship between competitive anxiety and heart rate variability (HRV) in swimming athletes. A total of 66 volunteers (41 male and 27 female) who swam the 400-m freestyle in the Brazilian Swimming Championships participated. Thirty minutes before the 400-m freestyle event, the athletes answered the Competitive Anxiety Inventory (CSAI-2R) questionnaire, then underwent anthropometric (body weight, height, and skinfold thickness) and HRV measurements. Then, at a second meeting, held 3 h after the 400-m freestyle event, the athletes returned to the evaluation room for HRV measurement (Polar® RS800cx, Kempele, Finland)...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238248/comparing-matchplay-characteristics-and-physical-demands-of-junior-and-professional-tennis-athletes-in-the-era-of-big-data
#16
Stephanie A Kovalchik, Machar Reid
Differences in the competitive performance characteristics of junior and professional tennis players are not well understood. The present study provides a comprehensive comparative analysis of junior and professional matchplay. The study utilized multiple large-scale datasets covering match, point, and shot outcomes over multiple years of competition. Regression analysis was used to identify differences between junior and professional matchplay. Top professional men and women were found to play significantly more matches, sets, and games compared to junior players of an equivalent ranking...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238247/effects-of-hypoxic-training-versus-normoxic-training-on-exercise-performance-in-competitive-swimmers
#17
Hun-Young Park, Kiwon Lim
In swimming competition, optimal swimming performance is characterized by a variety of interchangeable components, such as aerobic exercise capacity, anaerobic power and muscular function. Various hypoxic training methods would potentiate greater performance improvements compared to similar training at sea-level. Therefore, this study aimed to evaluate the effects of six-weeks of hypoxic training on exercise performance in moderately trained competitive swimmers. Twenty swimmers were equally divided into a normoxic training group (n = 10) for residing and training at sea-level (PIO2 = 149...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238246/preventive-and-regenerative-foam-rolling-are-equally-effective-in-reducing-fatigue-related-impairments-of-muscle-function-following-exercise
#18
Johannes Fleckenstein, Jan Wilke, Lutz Vogt, Winfried Banzer
Objectives of the study were to compare the effects of a single bout of preventive or regenerative foam rolling (FR) on exercise-induced neuromuscular exhaustion. Single-centre randomised-controlled study was designed. Forty-five healthy adults (22 female; 25±2 yrs) were allocated to three groups: 1) FR of the lower limb muscles prior to induction of fatigue, 2) FR after induction of fatigue, 3) no-treatment control. Neuromuscular exhaustion was provoked using a standardized and validated functional agility short-term fatigue protocol...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238245/explaining-match-outcome-during-the-men-s-basketball-tournament-at-the-olympic-games
#19
Anthony S Leicht, Miguel A Gómez, Carl T Woods
In preparation for the Olympics, there is a limited opportunity for coaches and athletes to interact regularly with team performance indicators providing important guidance to coaches for enhanced match success at the elite level. This study examined the relationship between match outcome and team performance indicators during men's basketball tournaments at the Olympic Games. Twelve team performance indicators were collated from all men's teams and matches during the basketball tournament of the 2004-2016 Olympic Games (n = 156)...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238244/influence-of-a-thermogenic-dietary-supplement-on-safety-markers-body-composition-energy-expenditure-muscular-performance-and-hormone-concentrations-a-randomized-placebo-controlled-double-blind-trial
#20
Grant M Tinsley, Stacie Urbina, Jacy Mullins, Jordan Outlaw, Sara Hayward, Matt Stone, Cliffa Foster, Colin Wilborn, Lem Taylor
Dietary supplementation is commonly employed by individuals seeking to improve body composition and exercise performance. The purpose of the present study was to examine the safety and effectiveness of a commercially available dietary supplement designed to promote thermogenesis and fat loss. In a randomized double-blind trial, participants were assigned to consume placebo or a multi-ingredient supplement containing caffeine, green tea extract, l-carnitine, evodiamine and other ingredients that purportedly enhance thermogenesis...
December 2017: Journal of Sports Science & Medicine
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