Abstract
The aim of this study was to analyse different success models and split time on cut-off point values on physical demands to keep category in semi-professional football players. An ad hoc observational controlled study was carried out with a total of ten (840 match data) outfield main players (25.2 ± 6.3 years, 1.79 ± 0.75 m, 74.9 ± 5.8 kg and 16.5 ± 6 years of football experience) and monitored using 15 Hz GPS devices. During 14 official matches from the Spanish division B in the 2016/2017 season, match data were coded considering the situational variable (score) and classified by match results (winning, losing or drawing). The results show significant differences between high-intensity attributes criteria that considered split time in velocity zones of 0–15 min (p = 0.043, ηp2 = 0.065, medium), 30–45 min (p = 0.010, ηp2 = 0.094, medium) and 60–75 min (p = 0.015, ηp2 = 0.086, medium), as well as sprint 60–75 min (p = 0.042, ηp2 = 0.066, medium) and 75–90 min (p = 0.002, ηp2 = 0.129, medium). Decision tree induction was applied to reduce the disparity range of data according to six 15-min intervals and to determine the cut-off point values for every parameter combination. It was possible to establish multivariate models for the main high-intensity actions criteria, allowing the establishment of all rules with their attributes and enabling the detection and visualisation of relationships and the pattern sets of variables for determining success.
Highlights
Football is characterised by brief linear and non-linear efforts of high intensity alternated with non-established periods of recovery [1], where performance depends on different technical, tactical, biomechanical, psychological and physiological characteristics [2]
Knowing that the attribution of success and failure is difficult to define and depends on the subject’s perspective [37], and in accordance with the approaches used in previous research [38], we propose the segmentation of the level of success, measured with the membership function if fuzzy set of success, with three labels: Success (S), Defeat (D) and a third intermediate one
The physical demands assessed were accurately coded across three linguistic labels, establishing the cut-off-point values of six zones of velocity, acceleration, deceleration and sprint numbers according to six 15-min intervals
Summary
Football is characterised by brief linear and non-linear efforts of high intensity alternated with non-established periods (short or long) of recovery [1], where performance depends on different technical, tactical, biomechanical, psychological and physiological characteristics [2]. A football player covers a total distance of 9–14 km [3]. This distance is mostly covered at a low intensity (
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