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Competing interests: DDC consults to a company who sell strength and power diagnostic devices.
Figures
Figure 1
Return to sport framework -…
Figure 1
Return to sport framework - the control-chaos continuum. Control=high level of structure on…
Figure 1
Return to sport framework - the control-chaos continuum. Control=high level of structure on behaviour/actions/movement, that is, controlled situation. Chaos=unpredictable behaviour/actions/movement, as to appear random/reactive, that is, chaotic situation. Green represents high control (low intensity) moving towards high chaos (high intensity). Model can be adjusted according to specific injury diagnosis, estimated tissue healing times and expected return to training. Acc/Dec Magnitude =rate of change in velocity, for example, 3 ms−2.**Game load adjustable dependent on injury type/severity. ACC, accelerations; BW, bodyweight; COD, change of direction; DEC, decelerations; Exp-D, explosive distance (accelerating/decelerating from 2 to 4 ms−1 <1 s); HSR, high-speed running (>5.5 ms−1); MS, maximal speed; MAXHR, maximal heart rate; PR, passive recovery; SPR, sprint distance (>7 ms−1); TD, total distance.
Figure 2
Sample return to chronic running…
Figure 2
Sample return to chronic running loads using the control-chaos continuum. Data representative of…
Figure 2
Sample return to chronic running loads using the control-chaos continuum. Data representative of central defender game load, that is, physical demands of game (mean) and respective training and concurrent (including game) in both absolute and relative (game load, ie, 2x=2 games). Control-chaos continuum: control=high level of structure onbehaviour/actions/movement, that is, controlled situation. Chaos=unpredictable behaviour/actions/movement, as to appear random/reactive, that is, chaotic situation. Green represents high control (low intensity) moving towards high chaos (high intensity). High-speed running, >5.5 ms−1; Sprint distance, >7 ms−1; Explosive distance (accelerating/decelerating from 2 to 4 ms−1<1 s).
Figure 3
Example of a potential weekly…
Figure 3
Example of a potential weekly planning template from high and moderate control. Arrows…
Figure 3
Example of a potential weekly planning template from high and moderate control. Arrows represent session load increments in week-to-week individual return to running sessions (increments represent increases in running loads individualised to the player and specifics of their injury). Intensity, arbitrary unit (au); Off, day off; Recovery, recovery day; RTR1, return to running 1; RTR2, return to running 2.
Figure 4
Example of a potential weekly…
Figure 4
Example of a potential weekly planning template from control—>chaos to high chaos. Arrows…
Figure 4
Example of a potential weekly planning template from control—>chaos to high chaos. Arrows represent load increments in week-to-week individual intensive and extension outdoor physical preparation sessions to build chronic load (increments represent increases in running loads individualised to player and specifics of their injury). Extensive, extensive football; Intensive, intensive football; Intensity; Intensity, arbitrary unit (au); Off, day off; Recovery, recovery day.
van der Horst N, Backx F, Goedhart EA, et al. . Return to play after hamstring injuries in football (soccer): a worldwide Delphi procedure regarding definition, medical criteria and decision-making. Br J Sports Med 2017;51:1583–91. 10.1136/bjsports-2016-097206
-
DOI
-
PubMed
McCall A, Lewin C, O’Driscoll G, et al. . Return to play: the challenge of balancing research and practice. Br J Sports Med 2017;51:702–3. 10.1136/bjsports-2016-096752
-
DOI
-
PubMed
Blanch P, Gabbett TJ. Has the athlete trained enough to return to play safely? The acute:chronic workload ratio permits clinicians to quantify a player’s risk of subsequent injury. Br J Sports Med 2016;50:471–5. 10.1136/bjsports-2015-095445
-
DOI
-
PubMed
Delecroix B, McCall A, Dawson B, et al. . Workload and non-contact injury incidence in elite football players competing in European leagues. Eur J Sport Sci 2018;18:1280–7. 10.1080/17461391.2018.1477994
-
DOI
-
PubMed
Cummins C, Orr R, O’Connor H, et al. . Global positioning systems (GPS) and microtechnology sensors in team sports: a systematic review. Sports Med 2013;43:1025–42. 10.1007/s40279-013-0069-2
-
DOI
-
PubMed