Abstract:
:The aim of this study was to examine shock attenuation before and after completing a maximal effort graded exercise test while running on a treadmill. Ten individuals ran before and after a maximal graded exercise test with running speed controlled between conditions. Transfer functions were calculated using surface-mounted accelerometers to represent shock attenuation. An accelerometer was mounted on the distal aspect of the tibia and another on the anterior aspect of the forehead. Ten strides were analysed in each condition for all participants. Paired t-tests were used to compare each dependent variable (shock attenuation, stride length, rate of oxygen consumption) between conditions (running before vs after the exercise test). Oxygen consumption was 16% greater when running after the graded exercise test (47.9 +/- 5.0 ml x kg(-1) x min(-1); mean+/-s) than when running before it (41.1 +/- 2.7 ml x kg(-1) x min(-1)) (P < 0.05). Stride length was similar during running before (2.71 +/- 0.15 m) and after (2.75 +/- 0.17 m) the graded exercise test (P > 0.05). Shock attenuation was, on average, 12% lower during running after (-9.8 +/- 2.6 dB) than before (-11.3 +/- 2.7 dB) the graded exercise test (P < 0.05). We conclude that less shock was attenuated during fatigued than non-fatigued running and that only subtle changes in stride length were made while fatigued.
journal_name
J Sports Scijournal_title
Journal of sports sciencesauthors
Mercer JA,Bates BT,Dufek JS,Hreljac Adoi
10.1080/0264041031000140383subject
Has Abstractpub_date
2003-11-01 00:00:00pages
911-9issue
11eissn
0264-0414issn
1466-447Xjournal_volume
21pub_type
杂志文章abstract::This study involved a systematic video analysis of 16 anterior cruciate ligament (ACL) injuries sustained by elite-level netball players during televised games in order to describe the game situation, the movement patterns involved, the player's behaviour, and a potential injury mechanism. Eight of the ACL injuries we...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2015.1121285
更新日期:2016-08-01 00:00:00
abstract::This study aimed to assess the effects of post-activation potentiation in the strength related variables of a kick start. Thirteen competitive swimmers performed three kick starts after a standardized warm up (denoted USUAL) and another after inducing post-activation through five isotonic repetitions on an eccentric f...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2018.1505183
更新日期:2019-02-01 00:00:00
abstract::Accurate measures of heart rate (HR) during rehabilitation and sporting activities are important for precise exercise prescription to maintain or increase capacity. Wrist-worn activity monitors utilizing photoplethysmography technology (PPG) to configure HR show discrepant findings regarding validity depending on the ...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2018.1535563
更新日期:2019-04-01 00:00:00
abstract::The present retrospective study intended to determine age, performance, the role of nationality and participation trends across calendar years in runners competing in "Comrades Marathon", the ultra-marathon with the longest tradition and the highest number of finishers worldwide. We analysed 235,467 finishers (40,211 ...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2018.1559979
更新日期:2019-06-01 00:00:00
abstract::Despite low mineral intakes in several groups of female 'ball-game' players, investigations of blood profiles and physical performance do not indicate any evident physiological benefits of micronutrient supplementation. Nevertheless, measurements of iron status are warranted, particularly in female athletes. Iron ther...
journal_title:Journal of sports sciences
pub_type: 杂志文章,评审
doi:
更新日期:1994-07-01 00:00:00
abstract::The main purposes of this study were to investigate the acute effects of static and dynamic lower limb stretching routines: (a) on peak torque, total external work and joint angle at peak torque of the hamstrings during maximal eccentric isokinetic leg flexion; (b) on unilateral hamstring to quadriceps (H/Q) strength ...
journal_title:Journal of sports sciences
pub_type: 杂志文章,随机对照试验
doi:10.1080/02640414.2012.751119
更新日期:2013-01-01 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
pub_type: 杂志文章
doi:10.1080/02640410500131944
更新日期:2006-04-01 00:00:00
abstract::This study characterises the relationship between gait variability and speed in runners using data from trunk accelerations in each axis. Twelve participants of varying fitness ran on the treadmill with three sessions of six randomly ordered self-selected speeds. A VO2max test was conducted on the fourth session. Runn...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2016.1262053
更新日期:2017-11-01 00:00:00
abstract::The purpose of this study was to examine the effects of task and ego goal orientation and moral identity on prosocial and antisocial judgement and behaviour in football. The interaction between task and ego orientation in predicting these variables was also examined. Participants were 210 adult male footballers (age 2...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640410500244531
更新日期:2006-05-01 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
pub_type: 杂志文章,随机对照试验
doi:10.1080/02640414.2016.1175651
更新日期:2017-03-01 00:00:00
abstract::Deci and Ryan's causality orientations theory suggests that there are individual differences in motivational orientation towards initiating and regulating behaviour. They described three causality orientations: autonomy, control and impersonal. The aim of this paper is to describe the development and concurrent validi...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/026404101300149393
更新日期:2001-06-01 00:00:00
abstract::Previous research on unstable footwear has suggested that it may induce mechanical noise during walking. The purpose of this study was to explore whether unstable footwear could be considered as a noise-based training gear to exercise body center of mass (CoM) motion during walking. Ground reaction forces were collect...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2018.1474726
更新日期:2018-12-01 00:00:00
abstract::The aims of this study were to examine the changes in plasma concentrations of inflammatory cytokines induced by training and competition in professional cyclists. We report the serum concentrations of interleukin-6 (IL-6), tumour necrosis factor alpha (TNF-a), tumour necrosis factor receptors I and II (TNFR-I and -II...
journal_title:Journal of sports sciences
pub_type: 杂志文章,随机对照试验
doi:10.1080/02640410500141158
更新日期:2006-06-01 00:00:00
abstract::Drug abuse by adolescents has been investigated in various surveys that reported correlations between age, gender, and activity. However, none of these studies included chemical analyses to help substantiate the statements of participants. In the present study, the urine specimens of 964 students (439 females, 525 mal...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640410801910293
更新日期:2008-08-01 00:00:00
abstract::This study investigated the effects of two different doses of caffeine on endurance cycle time trial performance in male athletes. Using a randomised, placebo-controlled, double-blind crossover study design, sixteen well-trained and familiarised male cyclists (Mean ± s: Age = 32.6 ± 8.3 years; Body mass = 78.5 ± 6.0 k...
journal_title:Journal of sports sciences
pub_type: 杂志文章,随机对照试验
doi:10.1080/02640414.2011.632431
更新日期:2012-01-01 00:00:00
abstract::The aim of this study was to determine the effects of positive and negative outcome imagery on golf-putting performance. Players of both high and low ability performed a golf-putting task in three imagery conditions: (a) a positive outcome imagery condition, (b) a negative outcome imagery condition and (c) a no-imager...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/026404102320183167
更新日期:2002-08-01 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
pub_type: 杂志文章,评审
doi:10.1080/02640419508732277
更新日期:1995-07-01 00:00:00
abstract::We investigated changes in cardiorespiratory performance, BMI and leisure-time physical activity among Finnish adolescents from 2003 to 2010. In addition, we compared cardiorespiratory performance levels between normal weight and overweight adolescents, grouped according to their physical activity. Participants were a...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2014.951874
更新日期:2015-01-01 00:00:00
abstract::Comfort has been shown to be the most desired football boot feature by players. Previous studies have shown discomfort to be related to increased plantar pressures for running shoes which, in some foot regions, has been suggested to be a causative factor in overuse injuries. This study examined the correlation between...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2016.1206661
更新日期:2017-05-01 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
pub_type: 杂志文章
doi:10.1080/02640414.2018.1449563
更新日期:2018-10-01 00:00:00
abstract::For the first time we aimed to: (1) assess fat-free mass (FFM) and RMR in youth soccer players, (2) compare measured RMR to estimated RMR using previously published prediction equations, and (3) develop a novel population-specific prediction equation. In a cross-sectional design, 99 males from a Premier League academy...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2020.1717286
更新日期:2020-01-01 00:00:00
abstract::This paper addresses the potential role of fatigue as a factor contributing to the deterioration of high level performance in ice hockey. Particularly, attention is given to the general description of different types of fatigue and the mechanisms underlying each type. Data have been presented illustrating the nature a...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640418708729784
更新日期:1987-01-01 00:00:00
abstract::The aims of this study were to describe the current anthropometric profiles of elite Australian female and male cricket fast bowlers and establish a set of reference values useful for future investigations on player selection, talent identification, and training programme development. The participants were 26 female (...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640410701275185
更新日期:2007-12-01 00:00:00
abstract::The purpose of this study was to examine the changes in the metabolic state of quadriceps femoris muscles using transverse relaxation time (T2), measured by muscle functional magnetic resonance (MR) imaging, after inactive or active recovery exercises with different intensities following high-intensity knee-extension ...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2013.855803
更新日期:2014-01-01 00:00:00
abstract::The aim of the current study was twofold: (1) to validate the use of action sport cameras for quantifying focus of visual attention in sailing and (2) to apply this method to examine whether an external focus of attention is associated with better performance in upwind sailing. To test the validity of this novel quant...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2015.1124135
更新日期:2016-08-01 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
pub_type: 杂志文章
doi:10.1080/02640414.2013.812231
更新日期:2014-01-01 00:00:00
abstract::This study examined the changes in running performance, maximal blood lactate concentrations and running kinematics between 85%BM anti-gravity (AG) running and normal over-ground (OG) running over an 8-week training period. Fifteen elite male developmental cricketers were assigned to either the AG or over-ground (CON)...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2018.1449092
更新日期:2018-10-01 00:00:00
abstract::Comprehension of a narrated diagram entail complex cognitive processing as learner is challenged to extract the orally evoked information. The present experiment examined the effects of 2 different forms of attention guidance - bottom-up and top-down - on comprehension performance, cognitive load investment, and motiv...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2016.1218034
更新日期:2017-06-01 00:00:00
abstract::Haem-oxygenase-1 (HO-1) is an antioxidant stress protein that is mainly induced by reactive oxygen species, inflammatory cytokines and hyperthermia. We assessed the influence of different types of exercise on HO-1 expression in leukocytes of the peripheral blood in three groups of male participants: a short exhaustive...
journal_title:Journal of sports sciences
pub_type: 临床试验,杂志文章
doi:10.1080/0264041031000071164
更新日期:2003-05-01 00:00:00
abstract::Since junior performances have little predictive value for future success, other solutions are sought to assess a young player's potential. The objectives of this systematic review are (1) to provide an overview of instruments measuring personal talent determinants of young players in racquet sports, and (2) to evalua...
journal_title:Journal of sports sciences
pub_type: 杂志文章,评审
doi:10.1080/02640414.2015.1061201
更新日期:2016-01-01 00:00:00