An examination of the relationship between athlete leadership and cohesion using social network analysis.

abstract：:Knowledge of the kinematic differences that separate highly skilled and less-skilled squash players could assist the progression of talent development. This study compared trunk, upper-limb and racket kinematics between two groups of nine highly skilled and less-skilled male athletes for forehand drive, volley and dro...

journal_title：Journal of sports sciences

authors： Williams BK,Sanders RH,Ryu JH,Graham-Smith P,Sinclair PJ

更新日期：2020-07-01 00:00:00

abstract：:The human spleen shows a decrease in volume of around 40% early during vigorous exercise and in response to other stressful stimuli such as maximal apnoea and the breathing of hypoxic gas mixtures. Contraction seems an active response, mediated by alpha-adrenergic fibres in the splenic nerve. Given the relatively smal...

journal_title：Journal of sports sciences

authors： Shephard RJ

更新日期：2016-01-01 00:00:00

abstract：:A maximal multistage 20 m shuttle run test was designed to determine the maximal aerobic power of schoolchildren, healthy adults attending fitness class and athletes performing in sports with frequent stops and starts (e.g. basketball, fencing and so on). Subjects run back and forth on a 20 m course and must touch the...

journal_title：Journal of sports sciences

authors： Léger LA,Mercier D,Gadoury C,Lambert J

更新日期：1988-07-01 00:00:00

abstract：:The objective of this study was to investigate the injury incidence and patterns in elite youth football at a category 1 Premier League Academy before and after the introduction of a new development strategy, the Elite Player Performance Plan (EPPP). A prospective study was performed over six consecutive seasons encom...

journal_title：Journal of sports sciences

authors： Tears C,Chesterton P,Wijnbergen M

更新日期：2018-10-01 00:00:00

abstract：:This series of four papers comprises a theoretical investigation into twisting somersaults. Both simple and complex mathematical models are used to provide an understanding of the mechanics of the production and removal of twist in somersaults. Various twisting techniques are evaluated and a method is developed for th...

journal_title：Journal of sports sciences

authors： Yeadon MR

更新日期：1993-06-01 00:00:00

abstract：:Chronic fatigue in the athletic population is a common but difficult diagnostic challenge for the sports physician. While a degree of fatigue may be normal for any athlete during periods of high-volume training, the clinician must be able to differentiate between this physiological fatigue and more prolonged, severe f...

journal_title：Journal of sports sciences

authors： Derman W,Schwellnus MP,Lambert MI,Emms M,Sinclair-Smith C,Kirby P,Noakes TD

更新日期：1997-06-01 00:00:00

abstract：:The aim of this study was to examine the occurrence of the sticking region by examining how three different grip widths affect the sticking region in powerlifters' bench press performance. It was hypothesised that the sticking region would occur at the same joint angle of the elbow and shoulder independent of grip wid...

journal_title：Journal of sports sciences

authors： Gomo O,Van Den Tillaar R

更新日期：2016-01-01 00:00:00

abstract：:The aim of this study was to identify the effects of adding spatial references during football small-sided games in youth players' tactical and physical performance. Twelve under-15 players performed a Gk+ 6v6+ Gk game under two playing conditions: (i) without spatial references (CONTROL condition); (ii) with spatial ...

journal_title：Journal of sports sciences

authors： Coutinho D,Gonçalves B,Travassos B,Abade E,Wong DP,Sampaio J

更新日期：2019-04-01 00:00:00

abstract：:Rowers competing at the 2000 Olympic Games were measured for 38 anthropometric dimensions. The aim was to identify common physical characteristics that could provide a competitive advantage. The participants included 140 male open-class rowers, 69 female open-class rowers, 50 male lightweight rowers, and 14 female lig...

journal_title：Journal of sports sciences

authors： Kerr DA,Ross WD,Norton K,Hume P,Kagawa M,Ackland TR

更新日期：2007-01-01 00:00:00

abstract：:The present study examined the extent to which scores on the Dispositional Flow Scale-2 (DFS-2) could differentiate individuals who frequently experience flow characteristics in physical activity from those who do not. A total of 993 participants completed the Japanese version of the DFS-2. Latent class factor analysi...

journal_title：Journal of sports sciences

authors： Kawabata M,Mallett CJ

更新日期：2012-01-01 00:00:00

abstract：:The causes of fatigue during muscular exercise include factors that reside in the brain (central mechanisms) as well as the muscles themselves (peripheral mechanisms). Central fatigue is largely unexplored, but there is increasing evidence that increased brain serotonin (5-HT) can lead to central (mental) fatigue, the...

journal_title：Journal of sports sciences

authors： Davis JM

更新日期：1995-07-01 00:00:00

abstract：:The inability of the between-bowlers methodology to control parameters external to technique could lead to erroneous significant and non-significant associations being reported between fast-bowling technique and ball release speed. Using Pearson's product - moment correlation, we first examined the effectiveness of a ...

journal_title：Journal of sports sciences

authors： Salter CW,Sinclair PJ,Portus MR

更新日期：2007-09-01 00:00:00

abstract：:Physiological and kinematic data were collected from elite under-19 rugby union players to provide a greater understanding of the physical demands of rugby union. Heart rate, blood lactate and time-motion analysis data were collected from 24 players (mean +/- s(x): body mass 88.7 +/- 9.9 kg, height 185 +/- 7 cm, age 1...

journal_title：Journal of sports sciences

authors： Deutsch MU,Maw GJ,Jenkins D,Reaburn P

更新日期：1998-08-01 00:00:00

abstract：:This study aimed to investigate why futsal players decide to dribble. For this purpose, we analysed 396 trials comprising the dribbles (n = 132), passes (n = 131) or shots (n = 133), performed by 70 male futsal players. Passing and shooting angles, and interpersonal distance, including their rates of change (velocity ...

journal_title：Journal of sports sciences

authors： Corrêa UC,de Pinho ST,da Silva SL,Clavijo FA,Souza TO,Tani G

更新日期：2016-12-01 00:00:00

abstract：:Interest in rises in oxygen consumption (VO2) with increasing exercise intensity largely originate from the work of Hill and colleagues in the 1920s. Their studies led to a belief that cardiac output and VO2 'plateau' at increasing work rates and that muscle hypoxia leads to fatigue. Hence, it was assumed that the pri...

journal_title：Journal of sports sciences

authors： Dennis SC,Noakes TD

更新日期：1998-01-01 00:00:00

abstract：:In order to investigate further the use of standardization procedures to determine training effects on cardiac dimension and function, two groups of subjects were analysed noninvasively. A control group of sedentary men (n = 7) and an experimental group of weight lifters (n = 12) volunteered for a standard M-mode echo...

journal_title：Journal of sports sciences

authors： Brown SP,Thompson WR

更新日期：1987-07-01 00:00:00

abstract：:Free radical production increases during exercise and oxidative damage occurs in several tissues. We examined the effects of three different exercise tests on the pattern of change of erythrocyte enzyme antioxidant activities. The tests were a short maximal exercise test, a submaximal prolonged exercise test and a cyc...

journal_title：Journal of sports sciences

authors： Tauler P,Aguiló A,Guix P,Jiménez F,Villa G,Tur JA,Córdova A,Pons A

更新日期：2005-01-01 00:00:00

abstract：:This study investigated the stability of the measurement of respiratory variables during rest, walking and running using the K4b(2) portable metabolic analyser in ten active males (age 31 ± 11 years; VO₂ peak 42.1 ± 2.6 ml · min(-1) · kg(-1)). Following a 10 min rest, participants completed three discontinuous increme...

journal_title：Journal of sports sciences

authors： Howe CC,Matzko RO,Piaser F,Pitsiladis YP,Easton C

更新日期：2014-01-01 00:00:00

abstract：:To determine the effect of circadian rhythm on neuromuscular responses and kinematics related to physical tennis performance, after a standardised warm-up, 13 highly competitive male tennis players were tested twice for serve velocity/accuracy (SVA), countermovement vertical jump (CMJ), isometric handgrip strength (IS...

journal_title：Journal of sports sciences

authors： López-Samanes Á,Moreno-Pérez D,Maté-Muñoz JL,Domínguez R,Pallarés JG,Mora-Rodriguez R,Ortega JF

更新日期：2017-11-01 00:00:00

abstract：:Although research into coaching has increased considerably during the last two decades, an area of neglect has been that of the professional youth coach. The aim of this study was to investigate the working behaviours of six top-level professional soccer coaches. Data were collected using a modified version of the Ari...

journal_title：Journal of sports sciences

authors： Smith M,Cushion CJ

更新日期：2006-04-01 00:00:00

abstract：:The aim of this study was to investigate the physical demands of international rugby union. Five games in the 1989-90 Five Nations Championship were analysed using video-recordings of live television transmissions. When the ball was in open play, the average running pace of players central to the action ranged from 5 ...

journal_title：Journal of sports sciences

authors： McLean DA

更新日期：1992-06-01 00:00:00

abstract：:The purpose of this meta-analytic review was to examine the extent and quality of research on the post-activation potentiation acute effect of rest interval manipulation on jumping performance. This manuscript adopted the recommendations from the Preferred Reporting Items for Systematic Reviews and Meta-Analyses State...

journal_title：Journal of sports sciences

authors： Gouvêa AL,Fernandes IA,César EP,Silva WA,Gomes PS

更新日期：2013-01-01 00:00:00

abstract：:Research indicates that instructing athlete's to focus on bodily movements (internal focus of attention [IFA]) may hinder performance, whereas instructing them to focus on the movement outcome (external focus of attention [EFA]) often enhances performance. Despite the importance of instructions in striking combat spor...

journal_title：Journal of sports sciences

authors： Halperin I,Chapman DW,Martin DT,Abbiss C

更新日期：2017-03-01 00:00:00

abstract：:Propulsive forces are important determinants of swimming performance. The aim of this study was to quantify the measurement error (uncertainty) in propulsive forces calculated from kinematic data. Ten operators digitized underwater video recordings of a breaststroke swimmer's right arm action. Four landmarks on the ha...

journal_title：Journal of sports sciences

authors： Payton CJ,Bartlett RM

更新日期：1995-12-01 00:00:00

abstract：:State anxiety is known to affect far aiming tasks, but less is known about the effects of state anxiety on running and aiming while running. Therefore, in the current study participants ran on a treadmill at their preferred speed in a low- and high-anxiety condition. In both conditions, running was combined with dart ...

journal_title：Journal of sports sciences

authors： Nibbeling N,Daanen HA,Gerritsma RM,Hofland RM,Oudejans RR

更新日期：2012-01-01 00:00:00

abstract：:Coaches are central to talent development in youth soccer and what they say and do impacts on players' achievements and well-being. Researchers have systematically observed coach behaviour and practice activities within this setting (i.e. 'what coaches do'). We review this research in light of contemporary discussion ...

journal_title：Journal of sports sciences

authors： Cushion C,Ford PR,Williams AM

更新日期：2012-01-01 00:00:00

abstract：:Two experiments were conducted to examine the hypothesis that learning by analogy will invoke characteristics of an implicit mode of motor learning. In the first experiment, table tennis novices learned to hit forehand topspin implicitly, explicitly or by analogy. The results showed that the analogy and implicit learn...

journal_title：Journal of sports sciences

authors： Liao CM,Masters RS

更新日期：2001-05-01 00:00:00

abstract：:This study examined the effect of wearing time on comfort perception and landing biomechanics of basketball shoes with different midsole hardness. Fifteen basketball players performed drop landing and layup first step while wearing shoes of different wearing time (new, 2-, 4-, 6- and 8-week) and hardness (soft, medium...

journal_title：Journal of sports sciences

authors： Lam WK,Liu H,Wu GQ,Liu ZL,Sun W

更新日期：2019-10-01 00:00:00

abstract：:Childhood sport participation is argued to be important to understand differences in self-regulation and performance level in adolescence. This study sought to investigate if football-specific activities in childhood (6-12 years of age) is related to self-regulatory skills and national under 14- and 15-team selection ...

journal_title：Journal of sports sciences

authors： Erikstad MK,Høigaard R,Johansen BT,Kandala NB,Haugen T

更新日期：2018-10-01 00:00:00

abstract：:Application of machine learning techniques has the potential to yield unseen insights into movement and permits visualisation of complex behaviours and tangible profiles. The aim of this study was to identify profiles of relative motor competence (MC) and movement behaviours in pre-school children using novel analytic...

journal_title：Journal of sports sciences

authors： Clark CCT,Duncan MJ,Eyre ELJ,Stratton G,García-Massó X,Estevan I

更新日期：2020-01-01 00:00:00