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Journal of Human Kinetics

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https://www.readbyqxmd.com/read/28713476/the-relationship-between-perceived-coaching-behaviours-motivation-and-self-efficacy-in-wrestlers
#1
İhsan Sarı, Betül Bayazıt
The current study aimed to determine the relationship between perceived coaching behaviours, motivation, self-efficacy and general self-efficacy of wrestlers who competed in the Super National Wrestling League. The sample consisted of 289 wrestlers. The Self-Efficacy Scale was used to measure self-efficacy perception, the Sports Motivation Scale to measure the motivation of the athletes, the Leadership Scale for Sport to determine perceived leadership behaviours, and the General Self-Efficacy Scale to determine the general self-efficacy perceptions of the athletes...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713475/perceived-hindrances-experienced-by-sport-coaches-in-south-africa
#2
Alliance Kubayi, Yoga Coopoo, Heather Morris-Eyton
The purpose of this study was to examine perceived hindrances encountered by sport coaches in the Gauteng Province of South Africa. A total of 224 sport coaches (122 males and 102 females) were purposively recruited to participate in this study. An exploratory factor analysis was used to assess the factor structure of the Perceived Hindrance Scale. The results of this study indicated the following as major hindrances encountered by sport coaches: "Lack of support systems for women players", "Lack of support for women coaches from superiors", "Low salary", "Lack of opportunities for promotion", "Difficulties with parents/spectators" and "Lack of job security"...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713474/plantar-pressure-differences-between-nordic-walking-techniques
#3
Alberto Encarnación-Martínez, Ángel Gabriel Lucas-Cuevas, Pedro Pérez-Soriano, Ruperto Menayo, Gemma María Gea-García
High plantar pressure has been associated with increased risk of injury. The characteristics of each physical activity determine the load on the lower limbs. The influence of Nordic Walking (NW) technique on plantar pressure is still unknown. The aim of this study was to analyze the differences between plantar pressure during NW with the Diagonal technique (DT) versus Alpha technique (AT) and compare them with the pressure obtained during normal walking (W). The normality and sphericity of the plantar pressure data were checked before performing a two-way repeated measures ANOVA in order to find differences between speeds (preferred, fast) and the gait (NW, W) as within-subject factors...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713473/home-advantage-in-judo-analysis-by-the-combat-phase-penalties-and-the-type-of-attack
#4
Ciro José Brito, Bianca Miarka, Alfonso López Díaz de Durana, David H Fukuda
Previous studies indicate positive home advantage in judo; however, the factors that influence home advantage have yet to be fully explored. This study investigated the potential differences in technical-tactical variables between home and visiting athletes. A total of 1411 video recorded matches were analyzed (123 home, 1288 away) from 36 international judo competitions contested in 2011-12. The matches were analyzed by the following criteria: combat phases (approach, gripping, attack, defense, groundwork and pause), penalties (by the athlete or the opponent) and the types of attacks (with or without a score)...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713472/performance-trends-in-master-butterfly-swimmers-competing-in-the-fina-world-championships
#5
Beat Knechtle, Pantelis T Nikolaidis, Thomas Rosemann, Christoph A Rüst
Performance trends in elite butterfly swimmers are well known, but less information is available regarding master butterfly swimmers. We investigated trends in participation, performance and sex differences in 9,606 female and 13,250 male butterfly race times classified into five-year master groups, from 25-29 to 90-94 years, competing in the FINA World Masters Championships between 1986 and 2014. Trends in participation were analyzed using linear regression analysis. Trends in performance changes were investigated using mixed-effects regression analyses with sex, distance and a calendar year as fixed variables...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713471/assessment-of-specificity-of-the-badcamp-agility-test-for-badminton-players
#6
Luiz de França Bahia Loureiro, Mário Oliveira Costa Dias, Felipe Couto Cremasco, Maicon Guimarães da Silva, Paulo Barbosa de Freitas
The Badcamp agility test was created to evaluate agility of badminton players. The Badcamp is a valid and reliable test, however, a doubt about the need for the use of this test exists as simpler tests could provide similar information about agility in badminton players. Thus, the aim of this study was to examine the specificity of the Badcamp, comparing the performance of badminton players and athletes from other sports in the Badcamp and the shuttle run agility test (SRAT). Sixty-four young male and female athletes aged between 14 and 16 years participated in the study...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713470/differences-in-anthropometry-biological-age-and-physical-fitness-between-young-elite-kayakers-and-canoeists
#7
Daniel López-Plaza, Fernando Alacid, José María Muyor, Pedro Ángel López-Miñarro
The aim of this study was to determine the anthropometric and physical characteristics of youth elite paddlers and to identify the differences between kayakers and canoeists. A total of 171 male paddlers (eighty-nine kayakers and eighty-two canoeists), aged 13.69 ± 0.57 years (mean ± SD) volunteered to participate in this study. The participants completed basic anthropometric assessments (body mass, stretch stature, sitting height, body mass index, maturity level, sum of 6 skinfolds and fat mass percentage) as well as a battery of physical fitness tests (overhead medicine ball throw, counter movement jump, sit-and-reach and 20 m multi-stage shuttle run tests)...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713469/anthropometric-profile-in-different-event-categories-of-acrobatic-gymnastics
#8
Yaiza Taboada-Iglesias, Mercedes Vernetta Santana, Águeda Gutiérrez-Sánchez
There is a specific anthropometric profile for each sport, which may be differentiated even in relation to the position, role or event category within each sport discipline. However, there are few studies on acrobatic gymnastics, and the goal of this work was to determine the anthropometric profile depending on the event category, as well as factors that predisposed to performance in these categories. The sample consisted of 150 gymnasts from Spain, divided into 8 groups according to the event category and the role played...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713468/a-model-for-determining-the-effect-of-the-wind-velocity-on-100-m-sprinting-performance
#9
Natasa Janjic, Darko Kapor, Dragan Doder, Aleksandar Petrovic, Radoslava Doder
This paper introduces an equation for determining instantaneous and final velocity of a sprinter in a 100 m run completed with a wind resistance ranging from 0.1 to 4.5 m/s. The validity of the equation was verified using the data of three world class sprinters: Carl Lewis, Maurice Green, and Usain Bolt. For the given constant wind velocity with the values + 0.9 and + 1.1 m/s, the wind contribution to the change of sprinter velocity was the same for the maximum as well as for the final velocity. This study assessed how the effect of the wind velocity influenced the change of sprinting velocity...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713467/quality-versus-quantity-debate-in-swimming-perceptions-and-training-practices-of-expert-swimming-coaches
#10
Frank J Nugent, Thomas M Comyns, Giles D Warrington
The debate over low-volume, high-intensity training versus high-volume, low-intensity training, commonly known as Quality versus Quantity, respectively, is a frequent topic of discussion among swimming coaches and academics. The aim of this study was to explore expert coaches' perceptions of quality and quantity coaching philosophies in competitive swimming and to investigate their current training practices. A purposeful sample of 11 expert swimming coaches was recruited for this study. The study was a mixed methods design and involved each coach participating in 1 semi-structured interview and completing 1 closed-ended questionnaire...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713466/intra-subject-variability-of-5-km-time-trial-performance-completed-by-competitive-trained-runners
#11
James Fisher, Thomas Clark, Katherine Newman-Judd, Josh Arnold, James Steele
Time-trials represent an ecologically valid approach to assessment of endurance performance. Such information is useful in the application of testing protocols and estimation of sample sizes required for research/magnitude based inference methods. The present study aimed to investigate the intra-subject variability of 5 km time-trial running performance in trained runners. Six competitive trained male runners (age = 33.8 ± 10.1 years; stature = 1.78 ± 0.01 m; body mass = 69.0 ± 10.4 kg, [Formula: see text]O2max = 62...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713465/a-comparison-of-gps-workload-demands-in-match-play-and-small-sided-games-by-the-positional-role-in-youth-soccer
#12
Mathew Beenham, David J Barron, John Fry, Howard H Hurst, Antonio Figueirdo, Steve Atkins
The external demands of small-sided games (SSGs) according to the positional role are currently unknown. Using a Catapult Minimax X3 5 Hz GPS, with a 100 Hz tri-axial accelerometer, we compared the accumulated tri-axial player workload per min (PLacc·min(-1)) during friendly youth match play (MP) (11 vs. 11) and SSGs (2 vs. 2, 3 vs. 3, and 4 vs. 4). Significant differences existed between all SSGs and MP for PLacc·min(-1) (F = 21.91, p < 0.001, η2 = 0.38), and individual X (F = 27.40, p < 0.001, η2 = 0...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713464/a-rapidly-incremented-tethered-swimming-test-for-defining-domain-specific-training-zones
#13
Dalton M Pessôa Filho, Leandro O C Siqueira, Astor R Simionato, Mário A C Espada, Daniel S Pestana, Fred J DiMenna
The purpose of this study was to investigate whether a tethered-swimming incremental test comprising small increases in resistive force applied every 60 seconds could delineate the isocapnic region during rapidly-incremented exercise. Sixteen competitive swimmers (male, n = 11; female, n = 5) performed: (a) a test to determine highest force during 30 seconds of all-out tethered swimming (Favg) and the ΔF, which represented the difference between Favg and the force required to maintain body alignment (Fbase), and (b) an incremental test beginning with 60 seconds of tethered swimming against a load that exceeded Fbase by 30% of ΔF followed by increments of 5% of ΔF every 60 seconds...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713463/cardiopulmonary-performance-during-maximal-exercise-in-soccer-players-with-alterations-in-renal-function
#14
Anderson Pontes Morales, Felipe Sampaio-Jorge, Luiz Felipe da Cruz Rangel, Jackson de Souza Menezes, Tiago Costa Leite, Beatriz Gonçalves Ribeiro
The aim of this study was to evaluate the curves of cardiorespiratory variables during cardiopulmonary exercise testing (CPET) in soccer players who had acute alterations in the glomerular filtration rate (GFR) after performing the pre-season training protocol. Sixteen male professional soccer players (25 ± 3 years; 179 ± 2 cm; and 77 ± 6 kg) were evaluated for oxygen uptake (VO2), heart rate (HR) and pulse relative oxygen (relative O2 Pulse) curves with intervals corresponding to 10% of the total duration of CPET...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713462/the-effect-of-foam-rolling-on-recovery-between-two-eight-hundred-metre-runs
#15
Anthony D'Amico, Vincent Paolone
With the increased popularity of foam rolling as a means of recovery, it is important to establish the exact manner in which the practice is useful. The purpose of this study was to examine the impact of foam rolling on recovery between two 800 m runs. Sixteen trained males (mean ± sd; age, 20.5 ± .5 yr; average 800 m treadmill run time, 145.2 ± 1.8 s) participated in the study, using a randomized, crossover design. The subjects completed two 800 m runs on a treadmill, separated by a 30 min rest, during which time a foam rolling protocol or passive rest period was performed...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713461/the-effects-of-maximal-intensity-exercise-on-cognitive-performance-in-children
#16
Roy David Samuel, Ofir Zavdy, Miriam Levav, Ronen Reuveny, Uriel Katz, Gal Dubnov-Raz
High intensity physical exercise has previously been found to lead to a decline in cognitive performance of adults. The aim of this study was to determine the effects of maximal intensity exercise on cognitive performance of children. Using a repeated-measures design, 20 children and adolescents aged 8-17 years completed a battery of tests measuring memory and attention. Forward and Backward Digit Span tests, the Rey Auditory-Verbal Learning Test (RAVLT) and the Digit Symbol Substitution Test (DSST) were performed at baseline, immediately after, and one hour after a maximal cardiopulmonary exercise test...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713460/effects-of-an-elastic-hamstring-assistance-device-during-downhill-running
#17
Randy L Aldret, Brittany A Trahan, Greggory Davis, Brian Campbell, David M Bellar
The purpose of this study was to determine the appropriateness of using an elastic hamstring assistance device to reduce perceived levels of soreness, increase isometric strength, increase passive range of motion, and decrease biomarkers of muscle damage after eccentric exercise, specifically, downhill running This study was conducted in a university exercise physiology laboratory placing sixteen apparently healthy males (X = 21.6 ± 2.5 years) into two groups using a pre-test/post-test design. Pre-intervention measures taken included participants' body height, body mass, body fat, capillary blood samples, VO2max, isometric hamstring strength at 45 and 90 degrees of flexion and passive hamstring range of motion...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713459/the-effects-of-bench-press-variations-in-competitive-athletes-on-muscle-activity-and-performance
#18
Atle Hole Saeterbakken, Dag-André Mo, Suzanne Scott, Vidar Andersen
The aim of the study was to compare the EMG activity performing 6RM competition style bench press (flat bench-wide grip) with 1) medium and narrow grip widths on a flat bench and 1) inclined and declined bench positions with a wide grip. Twelve bench press athletes competing at national and international level participated in the study. EMG activity was measured in the pectoralis major, anterior and posterior deltoid, biceps brachii, triceps brachii and latissimus dorsi. Non-significant differences in activation were observed between the three bench positions with the exception of 58...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713458/trunk-strength-characteristics-of-elite-alpine-skiers-a-comparison-with-physically-active-controls
#19
Carolin Hildebrandt, Lisa Müller, Christian Heisse, Christian Raschner
Core muscle imbalances and weak trunk strength are relevant for injury prevention and performance. Information regarding core strength requirements and ideal flexion/extension ratios in alpine skiing is limited. We aimed to compare trunk strength capacities in elite alpine skiers with those of a matched control group. The concentric maximal trunk flexion and extension of 109 elite skiers and 47 active controls were measured at 150°/s in a ballistic mode using the CON-TREX® TP 1000 test system. The relative flexion peak torque was higher in male ski racers (p = 0...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713457/personal-and-social-responsibility-among-athletes-the-role-of-self-determination-achievement-goals-and-engagement
#20
Paulo Martins, António Rosado, Vítor Ferreira, Rui Biscaia
The purpose of this study was to assess the relationship between motivation, engagement and personal and social responsibility among athletes. Based on the literature, a survey was conducted including measures of motivation, considering task orientation and ego orientation, intrinsic and extrinsic motivation, and amotivation. We also measured the components of engagement (dedication, confidence, vigor and enthusiasm) and the components of personal and social responsibility. A total of 517 athletes from different types of sports participated in the study...
June 2017: Journal of Human Kinetics
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