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Measures of (injury and illness) occurrence: a primer on epidemiological concepts and terminology for authors. (伤害和疾病)发生的测量:作者流行病学概念和术语入门
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2022-05-01 DOI: 10.1080/24733938.2022.2062897
Franco M Impellizzeri, Alan McCall, Tim Meyer, Maarten van Smeden
Since the beginning of Science and Medicine in Football (2017) as a standalone journal, we have experienced a rise in submissions in the area of epidemiology for injury and illness. Unfortunately, we have also noticed a pattern of inaccurate and confusing terminology when referring to measures of injury and illness occurrence, and when communicating risks. This can be partially explained, because the use of various terms as synonyms and ambiguous definitions has generated confusion and debate even within epidemiology (ElandtJohnson 1975; Bhopal 2016; Spronk et al. 2019). With this editorial, we aim to help authors, and our readers, by providing a very brief primer on the measures of occurrence used in epidemiology. A first distinction among the measures of disease frequency is between incidence and prevalence. For simplicity, we assume the existence of a data sample with data on individuals (e.g., football players) belonging to a group of interest, which we will refer to as ‘study population’. In the study population, certain health-related events or outcomes (e.g., illness or injury) are registered, and such an event or outcome will be referred to as ‘event’. Individuals in the study population that have or (over time) experience an ‘event’ are referred to as ‘cases’.
自《足球科学与医学》(2017)作为一本独立期刊出版以来,我们在伤病流行病学领域的投稿量有所增加。不幸的是,我们还注意到,在提及伤害和疾病发生的衡量标准以及传达风险时,术语存在不准确和混乱的模式。这可以部分解释,因为使用各种术语作为同义词和模棱两可的定义甚至在流行病学中也引起了混乱和争论(ElandtJohnson 1975;博帕尔2016;Spronk等人2019)。通过这篇社论,我们旨在通过提供一篇关于流行病学中使用的发病率测量的非常简短的入门文章来帮助作者和读者。衡量疾病频率的第一个区别是发病率和流行率。为了简单起见,我们假设存在一个数据样本,其中包含属于感兴趣群体的个人(如足球运动员)的数据,我们将其称为“研究人群”。在研究人群中,某些与健康相关的事件或结果(如疾病或伤害)被登记,此类事件或结果将被称为“事件”。研究人群中已经或(随着时间的推移)经历过“事件”的个人被称为“病例”。
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引用次数: 3
The maturity status but not the relative age influences elite young football players’ physical performance 成熟度而非相对年龄对优秀青年足球运动员身体素质的影响
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2022-03-11 DOI: 10.1080/24733938.2022.2053338
I. Peña-González, A. Javaloyes, E. Cervelló, M. Moya-Ramón
ABSTRACT Talent identification and selection process in young football is based on coaches’ decisions regarding the players’ performance at early ages. The aim of this study was to show how the maturity status and the relative age impact on young football players’ physical performance and their coaches’ efficacy expectations. The physical performance (1RM, Peak power output [PPO], 30-m sprint and t-test) of 118 young football players (U13 to U15; and their coaches’ efficacy expectations were assessed. Relative age was calculated according to the players’ date of birth within their selection year. The maturity status was estimated as the years from/to their peak height velocity (PHV). Linear regression analyses showed a significant relationship between players’ physical performance and their maturity status but not with their relative age. In contrast, the maturity status of players only was associated to the coaches’ efficacy expectations in the 1RM and PPO tests, whereas the relative age was a predictor of the coaches’ expectations about players’ performance in the t-test. These findings may be important for coaches and managers in young football academies since inter-individual differences in the maturity status but not in the relative age are related to physical performance despite the coaches’ expectations.
摘要:年轻足球的人才识别和选拔过程是基于教练对球员早期表现的决定。本研究的目的是展示成熟度和相对年龄如何影响年轻足球运动员的身体表现和教练的效能预期。对118名U13至U15年轻足球运动员的身体表现(1RM、峰值功率输出[PPO]、30米短跑和t检验)及其教练的疗效预期进行了评估。根据球员在其选择年份内的出生日期计算相对年龄。成熟状态估计为从/到其峰值身高速度(PHV)的年份。线性回归分析显示,球员的身体表现与他们的成熟状态之间存在显著关系,但与他们的相对年龄无关。相反,在1RM和PPO测试中,球员的成熟度仅与教练的效能预期相关,而在t检验中,相对年龄是教练对球员表现预期的预测因素。这些发现对年轻足球学院的教练和管理者来说可能很重要,因为尽管教练有期望,但成熟状态而非相对年龄的个体间差异与身体表现有关。
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引用次数: 6
Author reply to Weaving et al.: comment on: ‘A contemporary multi-modal mechanical approach to training monitoring in elite professional soccer: a mathematical problem?’ 作者回复韦文等人:评论:“精英职业足球训练监测的当代多模态机械方法:一个数学问题?”
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2021-06-19 DOI: 10.1080/24733938.2021.1942539
A. Owen
Dear Editor, We thank the authors of this particular paper for their constructive comments on our manuscript first published within Science and Medicine in football in 2017 (Owen et al. 2017) and welcome the opportunity to address some of the points raised. Overall, we agree with the points made and we welcome further debate within this research area. Furthermore, we take great satisfaction from the discussion the manuscript has caused within the practical and academic communities across professional team sport codes. We also hope these debates will allow for the opportunity for future research within other team sport codes across this multi-modal approach to monitoring. The main concerns raised by Weaving et al. (2020) relate to the collinearity of specific external loading measures that are provided from GPS micro sensor technology within the practical setting daily. We do not disagree with the comments on this fact; indeed, extensive reviews and additional manuscripts across the training load literature have reported on this issue across the preceding three-year period post the initial publication of the manuscript into multi-modal models in 2017. Additionally, while practically through mediums like social media and podcasts, there may have been an increase in interest within the topic area; academically, one additional research manuscript has been published in this area (Owen et al. 2019), highlighting the need for increased debate and refinement of the multi-modal approach originally published in 2017. This research, we hope, will incorporate the specific statistical requirements that may reduce the highlighted collinearity within the original model proposed by Owen and colleagues in 2017. It should be noted by academics that previous literature has reported on the disconnect between practitioners and academics with respect to embedded sports science research (Malone et al. 2019). The research reported that while research collaborations were mainly formed to improve team performance, academics ranked journal articles with increased importance, while practitioners rated one-to-one communication as more preferential. Furthermore, potential barriers were found in terms of staff buy-in, with practitioners reporting a preference for ‘fast’ type research. Overall, practitioners preferred ‘fast’ informal research dissemination compared to the ‘slow’ quality control approach of academics. The above highlights how research over time can improve any methodological issues associated with specific measures, but also how practitioners are concerned with the here and now, and getting staff buy-in through open communication channels with backroom teams and management within a high-performance setting. From its inception, the multi-modal approach was created to condense down specific external loading reports for applied practitioners into two key variables of volume and intensity represented by specific percentage values, in order to allow for a more simpli
2020年;Owen等人(2017),对团队运动中多模态概念的分析有所增加。像体育科学和科学中的所有新概念一样,这些概念都要经过同行评审分析,随着时间的推移,这些概念会受到限制;这些讨论产生了新的研究,最终推动了该主题领域的发展。最初的模型针对的是那些担心通过数据简化主义方法减少技术人员训练和比赛外部负荷报告之间理解差距的从业者,该方法产生了两个有针对性的训练措施,即:《2022年足球科学与医学》第6卷第270-271号https://doi.org/10.1080/24733938.2021.1942539
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引用次数: 0
Inter-methodological quantification of the target change for performance test outcomes relevant to elite female soccer players 与优秀女子足球运动员相关的成绩测试结果目标变化的方法间量化
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2021-06-19 DOI: 10.1080/24733938.2021.1942538
N. Datson, Lorenzo Lolli, B. Drust, G. Atkinson, M. Weston, W. Gregson
ABSTRACT Introduction Valid and informed interpretations of changes in physical performance test data are important within athletic development programmes. At present, there is a lack of consensus regarding a suitable method for deeming whether a change in physical performance is practically relevant or not. Methods We compared true population variance in mean test scores between those derived from evidence synthesis of observational studies to those derived from practioner opinion (n = 30), and to those derived from a measurement error (minimal detectable change) quantification (n = 140). All these methods can help to obtain ‘target’ change score values for performance variables. Results We found that the conventional ‘blanket’ target change of 0.2 (between-subjects SD) systematically underestimated practically relevant and more informed changes derived for 5-m sprinting, 30-m sprinting, CMJ, and Yo-Yo Intermittent Recovery Level 1 (IR1) tests in elite female soccer players. Conclusions For the first time in the field of sport and exercise sciences, we have illustrated the use of a principled approach for comparing different methods for the definition of changes in physical performance test variables that are practically relevant. Our between-method comparison approach provides preliminary guidance for arriving at target change values that may be useful for research purposes and tracking of individual female soccer player’s physical performance.
在运动发展计划中,对体能测试数据变化的有效和明智的解释是很重要的。目前,对于一种合适的方法来判断身体表现的变化是否实际相关,缺乏共识。方法:我们比较了观察性研究的证据合成得出的平均测试分数的真实总体方差与来自医生意见的结果(n = 30)和来自测量误差(最小可检测变化)量化的结果(n = 140)。所有这些方法都可以帮助获得性能变量的“目标”更改分值。结果我们发现,传统的“毯子”目标变化0.2(受试者间SD)系统性地低估了优秀女子足球运动员5米短跑、30米短跑、CMJ和悠悠球间歇恢复水平1 (IR1)测试中得出的实际相关和更灵通的变化。在体育和运动科学领域的第一次,我们已经说明了使用一个原则性的方法来比较不同的方法来定义在实际相关的物理性能测试变量的变化。我们的方法间比较方法为达到目标变化值提供了初步指导,这可能对研究目的和跟踪女子足球运动员个人的身体表现有用。
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引用次数: 8
The influence of relative playing area and player numerical imbalance on physical and perceptual demands in soccer small-sided game formats 相对比赛面积和球员数量失衡对足球小场地比赛中身体和感知需求的影响
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2021-06-11 DOI: 10.1080/24733938.2021.1939408
A. Guard, K. McMillan, Niall G Macfarlane
ABSTRACT Purpose This study aimed to examine physiological, mechanical and perceptual loading in small-sided games using different relative playing areas with balanced and unbalanced player numbers. Methods Data were collected in twelve elite youth male soccer players and included heart rate and standard time-motion outputs using commercial GPS. Results The data demonstrated higher cardiovascular, physical and perceptual demands with increasing pitch size (e.g. average HR was 88.7 vs. 86.7% HRmax with 8 vs. 2 high-intensity acceleration in medium vs. small pitch formats. The largest pitch format resulted in a greater accumulation of high-intensity distance (47 ± 30 m), higher peak velocity (25.2 ± 1.6 km.h−1) and a higher distance and frequency of accelerations (35 ± 9 m and 8 ± 3) compared with the smallest pitch (all p < 0.01). In unbalanced games, there was significantly greater average heart rate in the overloaded team (84.4 ± 4.9 vs. 80.4 ± 4.8% HRmax in 4 v. 6). Conclusion These data suggest that different game formats including numerical imbalance could be prescribed for squad management to target conditioning stimuli for specific players (e.g. to target a higher training load for players that do not get consistent match exposure).
摘要目的本研究旨在研究在玩家数量平衡和不平衡的情况下,使用不同相对游戏区域的小游戏中的生理、机械和感知负荷。方法收集12名优秀青年男子足球运动员的数据,包括使用商用GPS的心率和标准时间运动输出。结果随着音高大小的增加,数据显示出更高的心血管、身体和感知需求(例如,在中等音高格式和小音高格式中,平均HR分别为88.7和86.7%,高强度加速度分别为8和2。最大音高格式导致高强度距离的积累更大(47±30m),与最小投球相比,更高的峰值速度(25.2±1.6 km/h−1)和更高的距离和加速度频率(35±9 m和8±3)(均p<0.01)。结论这些数据表明,球队管理可以规定不同的比赛形式,包括数字失衡,以针对特定球员的条件刺激(例如,针对没有持续接触比赛的球员进行更高的训练负荷)。
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引用次数: 7
Re: A contemporary multi-modal mechanical approach to training monitoring in elite professional soccer: a statistical problem? 当代多模态机械方法在精英职业足球训练监测:一个统计问题?
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2021-05-28 DOI: 10.1080/24733938.2021.1934527
D. Weaving, D. Read
Dear Editors,We read an interesting approach to monitoring training load in the article titled “A contemporary multi-modal mechanical approach to training monitoring in elite professional soccer” p...
尊敬的编辑们,我们在题为“精英职业足球训练监控的现代多模态机械方法”的文章中读到了一种有趣的监控训练负荷的方法。。。
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引用次数: 0
An audit of hormonal contraceptive use in Women’s Super League soccer players; implications on symptomology 女足超级联赛运动员使用激素避孕药的审计;对症状的影响
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2021-05-16 DOI: 10.1080/24733938.2021.1921248
Lloyd J F Parker, K. Elliott-Sale, M. Hannon, J. Morton, G. Close
ABSTRACT Purpose To audit hormonal contraceptive use and associated symptomology in elite women’s soccer in England. Methods Seventy-five elite women’s soccer players from the Women’s Super League (WSL) completed a questionnaire to assess: hormonal contraceptive (HC) use or non-use, reasons for initiation and discontinuation and the symptoms experienced by HC and non-HC users. Results Twenty-eight per cent reported current HC use, with 43% having used HCs previously. Combined HCs accounted for 62% of total usage, with progestin-only HCs making up the remainder. Eighty-six per cent pre-empted negative symptoms before commencing HCs, with 38% experiencing adverse symptoms. Negative symptoms were most common in progestin-only HC users (63%). Eighty-six per cent reported benefits associated with HC usage include pain management and the ability to predict or control their cycles. Six non-HC users reported amenorrhea, with one medically diagnosed. Negative MC-related symptoms were reported by 74%, with 4% unable to train due to these symptoms. Unfavorable symptoms typically occurred during the first days of menstruation (59%). Conclusion Most WSL players do not currently use HCs (72%). Most HC users reported benefits of HC usage, whilst most non-HC users reported negative symptoms especially around menstruation. Practitioners should track players' MCs to help minimise discomfort and maximise performance.
【摘要】目的调查英国优秀女子足球运动员激素避孕药的使用情况及相关症状。方法采用问卷调查的方法,对75名中国女子足球超级联赛(WSL)优秀女足运动员使用或不使用激素避孕药(HC)、开始使用和停止使用激素避孕药(HC)的原因及未使用激素避孕药的症状进行评估。28%的人报告目前使用HC, 43%的人以前使用过HC。联合使用的hcc占总使用量的62%,剩下的仅使用黄体酮类hcc。86%的人在开始hcc治疗前预防了阴性症状,38%的人出现了不良症状。阴性症状在仅使用孕激素的HC使用者中最为常见(63%)。86%的人报告说,使用HC的好处包括疼痛管理和预测或控制月经周期的能力。六名非hc使用者报告闭经,其中一人经医学诊断。74%的人报告了阴性的mc相关症状,4%的人由于这些症状而无法训练。不良症状通常发生在月经的第一天(59%)。大多数WSL玩家目前不使用hc(72%)。大多数HC使用者报告了使用HC的好处,而大多数非HC使用者报告了负面症状,特别是在月经前后。从业者应该跟踪球员的mc,以帮助减少不适和提高表现。
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引用次数: 11
The development of metrics for measuring the level of symmetry in team formation and ball movement flow, and their association with performance 开发衡量球队阵型和球的移动流动的对称程度的指标,以及它们与表现的关系
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2021-05-13 DOI: 10.1080/24733938.2021.1919747
Eyal Eliakim, Elia Morgulev, R. Lidor, Orin Munk, Y. Meckel
ABSTRACT Objective In the current study, we examined how football players’ usage of space and the teams’ ball movement flow throughout the match are associated with the quality of performance achieved in competition. Methods We constructed two novel metrics that aimed at measuring spatial symmetry and passing flow on a team-wide scope. Our aim was to clarify whether the way players position themselves throughout the match, and the passing patterns they produce, can explain team success. Results An analysis of all matches played in the 2018–2019 English Premier League season (N = 380) revealed a positive relationship between the teams’ spatiotemporal dynamics and team performance. Conclusion Based on the findings of our analysis, we discuss the strengths and limitations of the newly-developed metrics, and stress the need for additional studies examining their effectiveness.
【摘要】目的本研究考察了足球运动员在比赛中对空间的利用和球队的球移动流与比赛中取得的成绩质量之间的关系。方法我们构建了两个新的指标,旨在测量空间对称性和团队范围内的传递流。我们的目的是澄清球员在比赛中的位置,以及他们的传球模式,是否可以解释球队的成功。结果对2018-2019赛季英超联赛的所有比赛(N = 380)进行分析,发现球队的时空动态与球队的表现呈正相关。根据我们的分析结果,我们讨论了新开发的指标的优势和局限性,并强调需要进一步的研究来检验其有效性。
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引用次数: 2
Collective behaviour in high and low-level youth soccer teams 高级别和低级别青年足球队的集体行为
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2021-04-20 DOI: 10.1080/24733938.2021.1917774
J. O’Brien-Smith, J. Fransen, William B. Sheehan, M. Lenoir, K. Bennett, M. Smith
ABSTRACT Background An expert/non-expert paradigm often helps understand the underpinnings of sports expertise; however, this method is scarcely extended to the complexities of collective behaviour in youth soccer. Aim Therefore, the objectives of the current study are to investigate differences in the collective behaviour of youth soccer teams by expertise level. Methodology Soccer players aged 15 to 20 years from high (n = 35) and low (n = 40) playing levels competed in two age-matched 5v5 small-sided games. For each game, teams’ skill involvement (shot, pass, dribble, touch), passing networks (closeness, density, betweenness), and spatiotemporal characteristics (stretch index, effective area, length (L) & width (W), LpW ratio, synchrony) were measured using video footage and GPS coordinates. Results High level teams had more attempted (p = .009), and completed skills (p = .003), particularly for the number of passes (p = .001) and shots (p = .012-.045). However, there were no significant between-group differences for either the passing networks or spatiotemporal characteristics. Conclusion The findings from the current research suggest that the high-level teams can quickly and effectively move the ball within existing team structures and may better optimise their afforded space to execute desired skills when compared to the low-level teams.
专家/非专家范式通常有助于理解体育专业知识的基础;然而,这种方法很少扩展到青少年足球集体行为的复杂性。因此,本研究的目的是调查青少年足球队在专业水平上的集体行为差异。15 - 20岁的高水平(n = 35)和低水平(n = 40)足球运动员参加了两场年龄匹配的5v5小型比赛。对于每场比赛,团队的技术参与(投篮,传球,运球,触球),传球网络(接近度,密度,间接性)和时空特征(拉伸指数,有效面积,长度(L)和宽度(W), LpW比,同步性)使用录像和GPS坐标进行测量。结果高水平的球队有更多的尝试(p = 0.009)和完成技能(p = 0.003),特别是在传球(p = 0.001)和射门(p = 0.012 - 0.045)的数量上。然而,在传递网络和时空特征上,组间差异不显著。目前的研究结果表明,与低水平的球队相比,高水平的球队可以在现有的球队结构中快速有效地移动球,并且可以更好地优化他们提供的空间来执行所需的技能。
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引用次数: 4
Effect of ball inclusion on jump performance in soccer players: a biomechanical approach 从生物力学角度探讨足球运动员带球对跳跃性能的影响
IF 3.4 2区 医学 Q1 SPORT SCIENCES Pub Date : 2021-04-09 DOI: 10.1080/24733938.2021.1915495
Alberto Fílter, Jesús Olivares Jabalera, Alejandro Molina-Molina, L. Suárez-Arrones, J. Robles-Rodríguez, Thomas Dos’Santos, I. Loturco, B. Requena, A. Santalla
ABSTRACT Objective In soccer, vertical jump means jumping toward a ball. Since no vertical jump test includes the ball as a reference element, the effect that the ball would have in a vertical jump test is unknown. The aim of this study was to examine the biomechanical differences between run-up vertical jump measurements without (Run-up Vertical Jump) and with ball inclusion (Heading Test). Methods Twelve semi- and professional soccer players were recruited. Athletes performed both jump tests in a biomechanical laboratory, where kinetic and spatiotemporal variables were collected and compared using a Student’s dependent t-test for paired samples. Results Overall, players performed a different jumping strategy during the heading test compared to the run-up vertical jump, exhibiting: 1) higher horizontal velocity during initial contact (+45.3%, P ≤ .001), 2) shorter contact time, greater rate of force development, and total impulse during push-off (+27.5%, +53%, and +10.6%, respectively, P ≤ .008), 3) higher CoM horizontal and resultant velocity during take-off (+76.1% and 20.5%, respectively, P ≤ .001), 4) better vertical jump performance (+4.3%, P ≤ .0001), and 5) larger body angle rotation during landing (+63.3%, P = .006), compared to run-up vertical jump (effect size: 0.78 to 3.7). Conclusion In general, soccer players display greater vertical jump heights in heading test, which highlights the importance of including an overhead ball during soccer-specific jump tests. Coaches and practitioners are encouraged to assess, and perhaps develop, the jumping ability of soccer players using a suspended ball as a specific target.
【摘要】目的在足球比赛中,垂直起跳是指朝着球跳。因为没有垂直跳跃测试将球作为参考元素,所以球在垂直跳跃测试中的效果是未知的。本研究的目的是检查无助跑垂直跳(助跑垂直跳)和有球(头球测试)助跑垂直跳测量之间的生物力学差异。方法招募12名半职业足球运动员。运动员在生物力学实验室中进行两项跳跃测试,在那里收集动力学和时空变量,并使用成对样本的学生相关t检验进行比较。结果总体而言,运动员在头球测试中的跳跃策略与助跑垂直起跳不同,表现为:1)初始接触时水平速度更高(+45.3%,P≤0.001),2)接触时间更短,推力发展速度和总冲量更大(分别为+27.5%,+53%和+10.6%,P≤0.008),3)起飞时CoM水平和合成速度更高(分别为+76.1%和20.5%,P≤0.001),4)垂直起跳性能更好(+4.3%,P≤0.0001),5)着陆时身体角度旋转更大(+63.3%,P = 0.006)(效应大小:0.78 - 3.7)。总的来说,足球运动员在头球测试中表现出更高的垂直起跳高度,这突出了在足球专项起跳测试中加入头顶球的重要性。教练和实践者被鼓励去评估,也许是发展足球运动员的跳跃能力,用一个悬着的球作为一个特定的目标。
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引用次数: 8
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Science and Medicine in Football
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