Metabolic Power Requirement of Change of Direction Speed in Young Soccer Players: Not All Is What It Seems

Hader, Karim; Méndez-Villanueva, Alberto; Palazzi, D.; Ahmaı̈di, Saı̈d; Buchheit, Martin

doi:10.1371/journal.pone.0149839

Cited by 90 publications

(95 citation statements)

References 47 publications

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“…A simple and relevant alternative to the use of arbitrary time windows could be to report acceleration over a meter (ie, the base unit of length in the International System of Units). 19 • Companies often update their data processing technique (software or unit chipset updates), which can create large differences in data output. 7 It is therefore almost impossible to hold historical databases, unless you never update your system.…”

Section: Limitations Of Common Tracking Variables With Special Refermentioning

confidence: 99%

“…19 • P GPS , if it was to be used as a global marker of mechanical work (combining level 1 and 2 types of variables), would not decipher the underlying mechanisms of the load-we rather use distance while accelerating, decelerating and while running at high-speed since those variables may relate directly to the load of specific muscle groups.…”

Section: Adding Value To Load-monitoring Systems?mentioning

confidence: 99%

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Player-Tracking Technology: Half-Full or Half-Empty Glass?

Buchheit¹,

Simpson²

2017

International Journal of Sports Physiology and Performance

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158

154

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With the ongoing development of microtechnology, player tracking has become one of the most important components of load monitoring in team sports. The 3 main objectives of player tracking are better understanding of practice (provide an objective, a posteriori evaluation of external load and locomotor demands of any given session or match), optimization of training-load patterns at the team level, and decision making on individual players' training programs to improve performance and prevent injuries (eg, top-up training vs unloading sequences, return to play progression). This paper discusses the basics of a simple tracking approach and the need to integrate multiple systems. The limitations of some of the most used variables in the field (including metabolic-power measures) are debated, and innovative and potentially new powerful variables are presented. The foundations of a successful player-monitoring system are probably laid on the pitch first, in the way practitioners collect their own tracking data, given the limitations of each variable, and how they report and use all this information, rather than in the technology and the variables per se. Overall, the decision to use any tracking technology or new variable should always be considered with a cost/benefit approach (ie, cost, ease of use, portability, manpower/ability to affect the training program).

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Section: Limitations Of Common Tracking Variables With Special Refermentioning

confidence: 99%

Section: Adding Value To Load-monitoring Systems?mentioning

confidence: 99%

Player-Tracking Technology: Half-Full or Half-Empty Glass?

Buchheit¹,

Simpson²

2017

International Journal of Sports Physiology and Performance

Self Cite

158

154

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show abstract

“…35 The physiological and mechanical consequences of directional changes during matches remain to be elucidated but some have quantified them in isolation. 62,63 Obtaining true match demands should incorporate accelerations but such data has yet to be validated using optical tracking systems. Although including accelerometer indices is more representative of current practices, it must be noted that these are typically presented 'blind' and without context.…”

mentioning

confidence: 99%

Are Current Physical Match Performance Metrics in Elite Soccer Fit for Purpose or Is the Adoption of an Integrated Approach Needed?

Bradley¹,

Ade²

2018

International Journal of Sports Physiology and Performance

124

152

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approach when evaluating match demands by simply reporting the distance covered or time spent along a motion continuum of walking through to sprinting. This methodology quantifies physical metrics in isolation without integrating other factors and this ultimately leads to a one-dimensional insight into match performance. Thus, this commentary proposes a novel 'integrated' approach that focuses on a sensitive physical metric such as high-intensity running but contextualizes this in relation to key tactical activities for each position and collectively for the team. In the example presented, the 'integrated' model clearly unveils the unique high-intensity profile that exists due to distinct tactical roles, rather than one-dimensional 'blind' distances produced by 'traditional' models. Intuitively this innovative concept may aid the coaches understanding of the physical performance in relation to the tactical roles and instructions given to the players. Additionally, it will enable practitioners to more effectively translate match metrics into training and testing protocols. This innovative model may well aid advances in other team sports that incorporate similar intermittent movements with tactical purpose.Evidence of the merits and application of this new concept are needed before the scientific community accepts this model as it may well add complexity to an area that conceivably needs simplicity.

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“…In support of the need to examine an athlete's approach to deceleration, the role of the preparation steps prior to turning or cutting should be considered. Higher cutting angles (i.e., ≥ 60°) require greater reductions in velocity to change the athletes state of momentum [27][28][29]. Greater braking forces during the penultimate foot contact ensure that athletes can maintain a higher entry velocity (as they can brake later) which results in faster CoD speed, and reduce the ground reaction force on the turning limb during the plant step [36].…”

Section: The Importance Of Decelerationmentioning

confidence: 99%

Change of Direction Assessment Following Anterior Cruciate Ligament Reconstruction: A Review of Current Practice and Considerations to Enhance Practical Application

et al. 2019

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Change of direction (CoD) has been indicated as a key mechanism in the occurrence of anterior cruciate ligament (ACL) injury during invasion sports. Despite these associations, assessments of knee function in athletic populations at the time of return to sport following ACL reconstruction (ACLr) have often focused on strength and single-leg hop tests, with a paucity of evidence to describe the CoD characteristics. Therefore, the aim of this narrative review was to describe the movement strategies exhibited following ACLr during CoD tasks and to critically analyze the range of tests that have been used. Specifically, we examined their ability to identify between-limb deficits and individuals who display a heightened risk of secondary injury and/or reductions in their level of pre-injury performance. MEDLINE, PubMed and SPORT Discuss databases were used and 13 articles were identified that met the inclusion criteria. Examination of the available literature indicates that current field-based practices are not representative of relevant sport demands and are unable to effectively assess knee function following ACLr. Laboratory-based studies have identified residual deficits and altered movement strategies at the time of return to sport, and this in part may be related to risk of re-injury. However, these assessments exhibit inherent limitations and are not practically viable for monitoring progress during rehabilitation. Consequently, alternative solutions that are more-aligned with the multitude of factors occurring during CoD maneuvers in chaotic sports environments are warranted to allow practitioners to 'bridge the gap' between the laboratory and the sports field/court. This approach may facilitate a more informed decision-making process with the end goal being, a heightened 'return to performance' and a lower risk of re-injury.

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Metabolic Power Requirement of Change of Direction Speed in Young Soccer Players: Not All Is What It Seems

Cited by 90 publications

References 47 publications

Player-Tracking Technology: Half-Full or Half-Empty Glass?

Player-Tracking Technology: Half-Full or Half-Empty Glass?

Are Current Physical Match Performance Metrics in Elite Soccer Fit for Purpose or Is the Adoption of an Integrated Approach Needed?

Change of Direction Assessment Following Anterior Cruciate Ligament Reconstruction: A Review of Current Practice and Considerations to Enhance Practical Application

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