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A comparison of match demands using ball-in-play vs. whole match data in elite male youth soccer players 优秀青年男子足球运动员在比赛中使用球与整场比赛数据的比赛需求比较
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-04-02 DOI: 10.1080/24733938.2019.1682183
Josh Wass, Dylan Mernagh, Ben Pollard, Perry F. Stewart, Wesley Fox, Nimai Parmar, B. Jones, L. Kilduff, A. Turner
ABSTRACT Instruction: Effective playing time in soccer is typically < 60 min per game and while players may reposition themselves when the ball is out of play, it is likely the physical demand decreases during this period. Therefore, if this period is included in data when quantifying match demands, it may under-report the physical requirements of soccer players. This study investigated an alternative method for quantifying external workload called ball in play (BiP), which analyses the data excluding stoppages, and thus potentially offers a more insightful analysis of match demands.Methods: Whole match demands as typically recorded via GPS, were compared to those based on BiP, and maximum BiP, with the latter representing worst case scenario phases of play. The 25-elite male youth soccer players (age: 17.9 ± 0.6 years; height: 174.8 ± 6.2 cm; body mass: 66.3 ± 8.1 kg) who participated in this study were also categorised in to positional groups (defender, midfielder, and forward) to assess differences in positional demands.Results: While no differences were noted based on position, whole match metrics were significantly lower than mean and maximum BiP metrics (p < 0.05). There was also a significant difference for maximum BiP outputs across different in-play durations, when comparing 30-60 seconds, 60–90 seconds, and > 90 seconds.Conclusion: This data allows practitioners to gain a deeper understanding of the physical demands imposed on players and plan sessions using targets that better represent match demands.
摘要:足球比赛的有效比赛时间通常小于60分钟,当球出球时,球员可能会重新定位,在此期间,身体需求可能会减少。因此,如果在量化比赛需求时将这段时间纳入数据,可能会低估足球运动员的身体需求。本研究研究了一种量化外部工作量的替代方法,称为比赛中球(BiP),该方法分析了不包括暂停的数据,从而可能提供更有洞察力的比赛需求分析。方法:通常通过GPS记录的整个比赛需求,与基于BiP和最大BiP的需求进行比较,后者代表游戏的最坏情况阶段。25名优秀青年男子足球运动员(年龄:17.9±0.6岁;高度:174.8±6.2 cm;体重:66.3±8.1 kg)的参与者也被分为位置组(后卫、中场和前锋),以评估位置需求的差异。结果:虽然体位差异无统计学意义,但整体匹配指标显著低于平均和最大BiP指标(p < 0.05)。在30-60秒、60-90秒和> - 90秒之间,在不同的游戏持续时间内,最大BiP输出也存在显著差异。结论:这些数据使从业者能够更深入地了解球员的身体需求,并使用更好地代表比赛需求的目标来计划训练。
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引用次数: 30
Simplifying the complexity of assessing physical performance in professional Australian football 简化评估澳大利亚职业足球身体表现的复杂性
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-03-21 DOI: 10.1080/24733938.2020.1745264
William B. Sheehan, Rhys Tribolet, R. Spurrs, J. Fransen, A. Novak, M. Watsford
ABSTRACT Purpose: To provide a simplified, novel method for analysing the physical demands in an Australian Football context by reducing the dimensionality of commonly reported physical characteristics obtained from match play. This may facilitate their practical use and interpretability. Methods: A retrospective longitudinal design was utilised with individual players’ physical outputs, measured via global navigation satellite system devices, collected during official Australian Football League matches over three seasons. A principal component analysis was used to reduce a large number of correlated physical characteristics related to the analysis of physical match demands into a smaller set of uncorrelated components. Results: Forty-six variables were reduced to five principal components whilst maintaining 56% of the variance in the original dataset. The principal component analysis derived five individual-based principal components pertaining to low-moderate movement volume, high speed running volume, accelerations, change of direction and impacts. Conclusions: Utilising factor loadings (eigenvectors) derived from a principal component analysis, this study is the first to provide a simplified, novel method for analysing the physical demands in an Australian Football context with the derived metrics revealing useful information for coaches and practitioners. This may consequently guide training implementation, player performance ratings and player selection. Further, these new values may facilitate the monitoring of physical player loads.
摘要目的:通过降低从比赛中获得的常见身体特征的维度,提供一种简化、新颖的方法来分析澳大利亚足球背景下的身体需求。这可能有助于它们的实际使用和可解释性。方法:采用回顾性纵向设计,通过全球导航卫星系统设备测量球员的身体输出,这些数据是在三个赛季的澳大利亚足球联赛官方比赛中收集的。主成分分析用于将与物理匹配需求分析相关的大量相关物理特征减少为一组较小的不相关成分。结果:46个变量被减少为5个主成分,同时保持原始数据集中56%的方差。主成分分析得出了五个基于个体的主成分,分别与中低运动量、高速跑量、加速度、方向变化和冲击有关。结论:利用主成分分析得出的因子负荷(特征向量),本研究首次提供了一种简化的、新颖的方法来分析澳大利亚足球背景下的身体需求,得出的指标为教练和从业者提供了有用的信息。因此,这可以指导训练实施、球员表现评级和球员选择。此外,这些新的值可以有助于监控物理玩家负载。
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引用次数: 6
Physical characteristics and match performances in women’s international versus domestic-level football players: a 2-year, league-wide study 国际和国内女子足球运动员的身体特征和比赛表现:一项为期2年的全联盟研究
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-03-21 DOI: 10.1080/24733938.2020.1745265
Dawn Scott, J. Haigh, R. Lovell
ABSTRACT Objective This study examined the role of physical qualities and physical match performances in distinguishing between elite performance levels in women’s football. Methods Over a two-season period (2016–2017), a league-wide study was conducted in which physical qualities and match external loads were collected in all players (n = 220) competing in the National Women’s Soccer League (NWSL) in the USA. During the first week of each pre-season, the standing broad jump, 30 m sprint, and the 30–15 intermittent fitness test were conducted under standardized conditions. In each competitive league fixture (3,268 individual match observations), 10 Hz GPS data were collected in all players who completed full matches and playing position was categorized. Total distance, and the distances covered above high (≥12.5 km h–1), very-high(≥19.0 km h–1), and sprinting velocities (≥22.5 km h–1) were used to quantity match physical performances. Players were further categorized as international (INT) or domestic-level (DOM) players according to their country’s squad selections during each season. Results There were few meaningful differences between INT and DOM players for either physical qualities or physical match performances. Conclusion Whilst physical qualities and match performances may impact upon performance outcomes, they generally do not distinguish between performance levels in elite women’s football.
【摘要】目的探讨身体素质和体能比赛表现在区分女足优秀水平中的作用。方法在2016-2017两个赛季期间,对参加美国全国女子足球联赛(NWSL)的所有球员(n = 220)的身体素质和比赛外负荷进行了研究。在每个季前赛的第一周,在标准化条件下进行立定跳远、30米短跑和30 - 15间歇性体能测试。在每个竞争性联赛中(3268场个人比赛观察),收集了所有完成比赛的球员的10 Hz GPS数据,并对比赛位置进行了分类。总距离、高(≥12.5 km h-1)、超高(≥19.0 km h-1)和冲刺速度(≥22.5 km h-1)以上距离用于定量匹配物理性能。根据每个赛季的国家队阵容,球员被进一步分为国际(INT)和国内(DOM)球员。结果INT型和DOM型运动员在身体素质和体能比赛表现上差异不大。虽然身体素质和比赛表现可能会影响成绩,但它们通常不会区分优秀女足的表现水平。
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引用次数: 29
The impact of a spatial occlusion training intervention on pass accuracy across a continuum of representative experimental design in football 空间遮挡训练干预对足球连续代表性实验设计传球准确性的影响
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-03-18 DOI: 10.1080/24733938.2020.1745263
A. Dunton, C. O'Neill, Edward K. Coughlan
ABSTRACT Introduction: The ability to successfully complete a pass in football can positively impact the result of the game. While previous work has identified the importance of perceptual behaviours before and during passing action, there is a paucity of research analysing the impact of training interventions on pass performance. Methods: A tri-phasic approach was employed to assess the impact of training with spatial occlusion goggles. Each phase was designed to assess participants’ ability to control and pass a football during a representative experimental task. The study design consisted of a pre-test, 2-week training intervention, post-test and 2-week retention test. Results: Significant improvements in response accuracy (p <.05) and response time (p <.05) were displayed across all three phases for those who wore occlusion goggles. Control error (p <.05) showed a significant improvement during phase one and phase two only. There were no sustained significant changes for those who did not wear the occlusion googles. Conclusion: Findings suggest that guiding the visual system away from the lower limbs while receiving a football and towards relevant information, the movement of a particular participant, within the environment can improve pass accuracy and speed of pass following a training intervention with occlusion goggles.
摘要简介:在足球比赛中,成功完成传球的能力会对比赛结果产生积极影响。虽然先前的工作已经确定了传球动作之前和过程中感知行为的重要性,但很少有研究分析训练干预对传球表现的影响。方法:采用三阶段法评估空间遮挡护目镜训练的影响。每个阶段都旨在评估参与者在代表性实验任务中控制和传递足球的能力。研究设计包括前测试、两周训练干预、后测试和两周保留测试。结果:佩戴遮挡护目镜的患者在所有三个阶段的反应准确性(p<0.05)和反应时间(p<0.05)都有显著改善。对照误差(p<0.05)仅在第一阶段和第二阶段显示出显著改善。没有佩戴遮挡谷歌眼镜的人没有持续的显著变化。结论:研究结果表明,在接受足球训练时,引导视觉系统远离下肢,转向相关信息,即特定参与者在环境中的运动,可以在使用遮挡护目镜进行训练干预后提高传球准确性和速度。
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引用次数: 7
Recovery timeline following resistance training in professional female soccer players 职业女子足球运动员阻力训练后的恢复时间表
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-03-09 DOI: 10.1080/24733938.2020.1737724
Karine N. O. Goulart, R. Duffield, Geraldo Oliveira Carvalho Junior, Guilherme Passos Ramos, E. Pimenta, B. Couto
ABSTRACT Objective Determine the time-course of recovery after a resistance training session (RT) in female soccer players. Methods Ten Brazilian female professional soccer players undertook testing prior to and at immediately, 24 and 48 h post-RT. RT was a high-speed and low-load session, consisting of three sets of six repetitions of lower body exercises at 50%1RM. Tests included countermovement jump (CMJ) and 20 m sprint, with the best and mean efforts recorded. Delayed onset muscle soreness (DOMS), total quality recovery (TQR) and Brazilian Mood Scale (BRAMS) were collected. Repeated measures ANOVA with effect sizes (ES) assessed the time-course of recovery (α=0.05). Results Mean and best CMJ performance decreased immediately post-RT (p<0.05, ES=−0.49; −0.65, respectively), though no significant differences and trivial-small effects existed at 24h (p>0.05, ES=−0.15; −0.08) and 48h (p>0.05, ES=0.14; −0.21). No significant differences and trivial-small effects were evident at any time for mean or best 10m (p>0.05, ES=−0.18–0.26) or 20m (p>0.05, ES=−0.08–0.19) performance. DOMS, TQR, fatigue and vigor did not change following RT (p>0.05; ES=-0.51-0.48). Conclusion Light-load, high-speed RT induces only small, immediate changes in CMJ, without prolonged suppression of recovery parameters. Such training seems feasible for inclusion in competitive micro-cycles at least 24h prior to the next match.
摘要目的确定女子足球运动员阻力训练后恢复的时间过程。方法10名巴西女职业足球运动员在RT前和RT后即刻、24小时和48小时进行测试。RT是一种高速低负荷训练,包括三组,每组六次,以50%1RM的速度重复下半身运动。测试包括反动作跳跃(CMJ)和20米短跑,记录了最佳和平均的努力。收集迟发性肌肉酸痛(DOMS)、总质量恢复(TQR)和巴西情绪量表(BRAMS)。具有效应大小(ES)的重复测量方差分析评估了恢复的时间过程(α=0.05)表演DOMS、TQR、疲劳和活力在RT后没有变化(p>0.05;ES=-0.51-0.48)。这种训练似乎可以在下一场比赛前至少24小时纳入竞技微循环。
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引用次数: 2
Concussions in U.S. youth soccer players: results from the U.S. soccer online concussion survey 美国青少年足球运动员脑震荡:美国足球在线脑震荡调查结果
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-03-05 DOI: 10.1080/24733938.2020.1736327
A. Kontos, S. Eagle, M. Putukian, D. Kirkendall, G. Chiampas, T. Kaminski
ABSTRACT Purpose: This study aimed to describe incidence rates of concussion from alarge online survey of United States (U.S.) male and female youth soccer players; and to compare rates by age group, sex, competitive level, and practices compared to games.Methods: The survey was conducted through US Soccer consisting of three sections; demographic data, soccer heading exposure and awareness of US Soccer heading guidelines, and concussion data.Results: Respondents (n = 8,104) completed aretrospective online survey during the fall 2016 season representing 101,699 (42,048 girls; 41%) youth soccer players aged 7–14. Outcomes were concussion prevalence per 100 players and incidence per 10,000 athletic exposures (AE). Total concussion incidence for the sample was 8.48/10,000 athlete exposures (AE). Games (rather than practice) and older age (11–14) players had higher rates of concussion (Games: IRR = 5.67, Older Age: IRR = 2.68). Fewer than 1 in 5 concussions (47/253; 19%) occurred during attempted purposeful heading of the ball.Discussion: Overall, 82% (208/253) of all reported concussions received some form of clinical care. A majority of players sought care following their concussion suggesting that awareness and education efforts are having a positive effect on behavior.
摘要目的:本研究旨在描述美国青少年足球运动员脑震荡的发病率;并按年龄组、性别、竞技水平和训练方式与比赛进行比较。方法:本次调查通过《美国足球》进行,分为三个部分;人口统计数据、足球头暴露和对美国足球头指南的认识,以及脑震荡数据。结果:受访者(n=8104)在2016年秋季完成了一项前瞻性的在线调查,调查对象为101699名7-14岁的青少年足球运动员(42048名女孩;41%)。结果是每100名球员脑震荡发生率和每10000次运动暴露的发生率(AE)。样本的脑震荡总发生率为8.48/1000名运动员暴露(AE)。比赛(而不是练习)和年龄较大(11-14岁)的球员脑震荡发生率较高(比赛:IRR=5.67,年龄较大:IRR=2.68)。只有不到五分之一的脑震荡(47/253;19%)发生在尝试有目的的头球过程中。讨论:总体而言,82%(208/253)的脑震荡报告接受了某种形式的临床护理。大多数球员在脑震荡后寻求治疗,这表明意识和教育工作对行为产生了积极影响。
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引用次数: 5
Motion tracking in young male football players: a preliminary study of within-session movement reliability 青年男子足球运动员运动追踪:运动可靠性的初步研究
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-03-04 DOI: 10.1080/24733938.2020.1737329
Mihkel M. Laas, M. Wright, S. McLaren, D. Eaves, G. Parkin, M. Portas
ABSTRACT Purpose We assessed the reliability of fundamental movement skills in young male footballers within one session. Methods: 197 players from 5 English category 3 football academies across U9 – U18 age groups volunteered (mean: age = 12.6 ± 2.8 years; stature = 156 ± 17 cm; weight = 47 ± 15 kg; years from peak height velocity (PHV) = – 1.1 ± 2.3). Motion tracking of squat depth and anterior Y-balance test maximum reach was recorded. Reliability was assessed (trial 1 vs. 2; trial 2 vs. 3) via mean change, intraclass correlation coefficient (ICC), and typical error. Results: The overall mean change was trivial (−1.8–2.9%), while Y-balance left showed a small negative change (trial 2 vs. 3; −3.2%). All ICCs across the tests ranged from moderate to high (0.71–0.79). Typical errors for Y-balance tests ranged from 8.3–10.8% and squats from 19.3–21.8%. Pre-PHV vs. post-PHV players had similar typical errors for Y-balance left and right (9.0 vs. 11.5%; 9.0 vs. 7.1%, respectively), and the squat (21.1 vs. 20%). Conclusions: The high within-player typical error scores obtained over three trials suggest that, contrary to some movement screening guidelines, prior habituation is needed to increase both the stability and reliability of these tests.
摘要目的我们在一次训练中评估了年轻男子足球运动员基本动作技能的可靠性。方法:来自U9–U18年龄组的5所英国三级足球学院的197名球员自愿参加比赛(平均年龄:12.6±2.8岁;身高:156±17厘米;体重:47±15公斤;身高峰值速度(PHV):-1.1±2.3岁)。记录深蹲深度和前Y平衡测试最大范围的运动跟踪。通过平均值变化、组内相关系数(ICC)和典型误差来评估可靠性(试验1对2;试验2对3)。结果:总体平均变化较小(-1.8-2.9%),而左Y平衡显示出较小的负变化(试验2对3;-3.2%)。测试中的所有ICCs从中等到高(0.71–0.79)。Y平衡测试的典型误差从8.3-10.8%到深蹲19.3-21.8%。PHV前和PHV后的球员在左Y平衡和右Y平衡(分别为9.0对11.5%;9.0对7.1%)以及深蹲(21.1对20%)方面的典型误差相似。结论:在三次试验中获得的高运动员内典型错误分数表明,与一些运动筛查指南相反,需要事先习惯化来提高这些测试的稳定性和可靠性。
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引用次数: 3
The impact of ball recovery type, location of ball recovery and duration of possession on the outcomes of possessions in the English Premier League and the Spanish La Liga 在英超和西甲联赛中,回球类型、回球位置和控球时间对控球结果的影响
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-01-27 DOI: 10.1080/24733938.2020.1722319
Daniel Cooper, C. Pulling
ABSTRACT Objective The aim of this study was to explore the impact of the ball recovery type, location of ball recovery and the duration of the possession on the outcomes of possessions in both the EPL and the Spanish La Liga. Methods In total, 4971 possessions were observed across 20 matches from the 2017/2018 season of both the EPL (n = 2469) and La Liga (n = 2502). Ball recovery was analysed across four zones, supplemented by five types of ball recovery (interception, tackle, goalkeeper save, set-play and turnover) and three different possession duration categories (<5 seconds, 5–12 seconds and >12 seconds). Each of these were analysed according to five different attacking outcomes. Results La Liga teams scored relatively more goals when recovering possession through a tackle (2.5% of tackles led to a goal). EPL teams scored relatively more goals and took more shots after turnovers (2.0% of turnovers led to a goal and 14.6% of turnovers led to a shot). EPL teams are more likely to score a goal or create a shooting opportunity when utilising shorter possessions (<5 seconds), whereas La Liga teams are more likely to score a goal after utilising longer possessions (>12 seconds).
摘要目的本研究旨在探讨在英超联赛和西甲联赛中,回球类型、回球位置和控球时间对控球结果的影响。方法在2017/2018赛季的英超联赛(n=2469)和西甲联赛(n=2502)的20场比赛中,总共观察到4971次控球。对四个区域的回球进行了分析,并辅以五种类型的回球(拦截、铲球、守门员扑救、定位球和失误)和三种不同的控球时间类别(12秒)。根据五种不同的攻击结果对每种攻击进行分析。结果西甲球队在通过铲球恢复控球权时进球相对较多(2.5%的铲球导致进球)。英超球队的进球相对较多,失误后射门次数较多(2.0%的失误导致进球,14.6%的失误导致射门)。当使用较短的控球时间(12秒)时,英超球队更有可能进球或创造射门机会。
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引用次数: 6
To infinity and beyond: the use of GPS devices within the football codes 向无限延伸:在足球代码中使用GPS设备
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-01-02 DOI: 10.1080/24733938.2019.1679871
J. Malone, S. Barrett, C. Barnes, C. Twist, B. Drust
ABSTRACT The quantification of external load through global positioning systems (GPS) is now commonplace across the different football codes. Despite this acceptance amongst sports science practitioners, confusion still remains around which are the most appropriate metrics to use when monitoring their athletes. In addition, the translation of the message between the data gathered and the athletes and coaches can often be lost. The aim of this commentary is to provide discussion and recommendations when using GPS for athlete monitoring.
摘要:通过全球定位系统(GPS)对外部负荷进行量化现在在不同的足球代码中很常见。尽管体育科学从业者接受了这一点,但在监测运动员时,哪些指标是最合适的,仍然存在困惑。此外,收集到的数据与运动员和教练之间的信息转换往往会丢失。本评论的目的是在使用GPS进行运动员监测时提供讨论和建议。
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引用次数: 22
Interchangeability of position tracking technologies; can we merge the data? 位置跟踪技术的互换性;我们能合并数据吗?
IF 3.4 2区 医学 Q1 Health Professions Pub Date : 2020-01-02 DOI: 10.1080/24733938.2019.1634279
M. Taberner, J. O'keefe, David Flower, J. Phillips, G. Close, D. Cohen, C. Richter, C. Carling
ABSTRACT Purpose: The purpose of this study was to assess the interchangeability of position tracking metrics obtained using global positioning systems (GPS) versus those obtained by a semi-automatic high definition (HD) optical camera system. Methods: Data was collected from a cohort of 29 elite football players (age: 23.1 ± 5.1 years, height: 180.4 ± 5.8 cm, mass: 74.6 ± 6.7 kg) in four matches played in four different stadiums. In two matches 10 Hz GPS (GPS-1, StatSports, Belfast, UK) were used, while in the other two matches augmented 10 Hz GPS (GPS-2, StatSports, Belfast, UK) were used. All four matches were analysed concomitantly using six semi-automated HD motion cameras sampling at 25 Hz (TRACAB, Chyronhego, New York, USA). Results: Mean bias was between 6% and 10% for GPS-1 and 1–4% for GPS-2, respectively. No proportional bias was found (p > 0.184). The SEE within calibration functions (expressed in % to mean) was between 5% and 22% for GPS-1 and 4–14% for GPS-2. While some significant differences existed between GPS-1 and TRACAB (total distance and high-speed), positional tracking variables were highly correlated between GPS-1, GPS-2 and TRACAB (r2> 0.92) with GPS-2 displaying stronger correlations (> r2 = 0.96). Conclusion: In the present study augmented GPS technology (GPS-2) and the TRACAB camera system provided interchangeable measures of positional tracking metrics to allow concurrent assessment and monitoring of training and competition in football players. However, we recommend practitioners evaluate their own systems to identify where errors exist, calculate and apply the regression equations to confidently interchange data.
摘要目的:本研究的目的是评估使用全球定位系统(GPS)获得的位置跟踪指标与半自动高清晰度(HD)光学相机系统获得的位置跟踪指标的互换性。方法:选取年龄23.1±5.1岁,身高180.4±5.8 cm,体重74.6±6.7 kg的29名优秀足球运动员,在4个不同的体育场馆进行4场比赛。在两场比赛中使用了10hz GPS (GPS-1, StatSports,贝尔法斯特,英国),而在另外两场比赛中使用了增强10hz GPS (GPS-2, StatSports,贝尔法斯特,英国)。同时使用6台以25 Hz采样的半自动高清运动摄像机(TRACAB, Chyronhego, New York, USA)对所有4种匹配进行分析。结果:GPS-1和GPS-2的平均偏倚分别在6% - 10%和1-4%之间。未发现比例偏倚(p < 0.184)。校准函数内的SEE(以% to mean表示)在GPS-1和GPS-2中分别为5% - 22%和4-14%。GPS-1、GPS-2和TRACAB之间的位置跟踪变量(总距离和高速)存在显著差异,但GPS-1、GPS-2和TRACAB之间的位置跟踪变量相关性较高(r2> = 0.92),其中GPS-2相关性较强(> r2 = 0.96)。结论:在本研究中,增强型GPS技术(GPS-2)和TRACAB相机系统提供了可互换的位置跟踪指标,可以同时评估和监测足球运动员的训练和比赛。然而,我们建议从业者评估他们自己的系统,以确定错误存在的地方,计算和应用回归方程来自信地交换数据。
{"title":"Interchangeability of position tracking technologies; can we merge the data?","authors":"M. Taberner, J. O'keefe, David Flower, J. Phillips, G. Close, D. Cohen, C. Richter, C. Carling","doi":"10.1080/24733938.2019.1634279","DOIUrl":"https://doi.org/10.1080/24733938.2019.1634279","url":null,"abstract":"ABSTRACT Purpose: The purpose of this study was to assess the interchangeability of position tracking metrics obtained using global positioning systems (GPS) versus those obtained by a semi-automatic high definition (HD) optical camera system. Methods: Data was collected from a cohort of 29 elite football players (age: 23.1 ± 5.1 years, height: 180.4 ± 5.8 cm, mass: 74.6 ± 6.7 kg) in four matches played in four different stadiums. In two matches 10 Hz GPS (GPS-1, StatSports, Belfast, UK) were used, while in the other two matches augmented 10 Hz GPS (GPS-2, StatSports, Belfast, UK) were used. All four matches were analysed concomitantly using six semi-automated HD motion cameras sampling at 25 Hz (TRACAB, Chyronhego, New York, USA). Results: Mean bias was between 6% and 10% for GPS-1 and 1–4% for GPS-2, respectively. No proportional bias was found (p > 0.184). The SEE within calibration functions (expressed in % to mean) was between 5% and 22% for GPS-1 and 4–14% for GPS-2. While some significant differences existed between GPS-1 and TRACAB (total distance and high-speed), positional tracking variables were highly correlated between GPS-1, GPS-2 and TRACAB (r2> 0.92) with GPS-2 displaying stronger correlations (> r2 = 0.96). Conclusion: In the present study augmented GPS technology (GPS-2) and the TRACAB camera system provided interchangeable measures of positional tracking metrics to allow concurrent assessment and monitoring of training and competition in football players. However, we recommend practitioners evaluate their own systems to identify where errors exist, calculate and apply the regression equations to confidently interchange data.","PeriodicalId":48512,"journal":{"name":"Science and Medicine in Football","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24733938.2019.1634279","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47632950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
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Science and Medicine in Football
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