## 1 Introduction  
Elite football is characterized as an intermittent team sport, interspersing bouts of high-intensity actions (HIAs) with longer periods of low activity [1; 2; 3]. These HIA predominantly occur during critical moments of match play, such as goal scoring [4]. Nowadays, football has witnessed an increase in action density and speed, facilitated by game systems that create free peripheral spaces and enable HIAs [5]. Among these HIAs, accelerations (Ac) and decelerations (Dec) are crucial in determining match outcomes, allowing players to adapt to tactical demands, win duels, and create or defend goal attempts [4; 6; 7]. Ac/Dec are physically and metabolically demanding actions, even when not performed at high speed [5; 6; 7; 8], contributing 5-16% of a player'stotal load per match and requiring high rates of force development [9; 10]. Increases in the number and duration of acceleration movements are associated with delayed increases in peak heart rate, higher lactate levels, greater perceived fatigue, and an increased risk of muscle damage from heightened concentric and eccentric contractions [11; 12], making them indicators of a player's match-related fatigue state [9; 12]. Since 2006, the average number of Ac/Dec per match has risen, increasing by up to 50% [12; 13]. Professional footballers, depending on their playing positions, cover around 9 to 13 km per game. They typically sprint 600-1200 m at high speed and perform 60 to 100 accelerations. Similar figures are observed for elite youth players [4; 14]. The common practice of evaluating professional football performance using the high-speed running threshold (19.8-25.1 km\(\cdot\)h\({}^{-1}\)) overlooks the energy expenditure associated with Ac/Dec, thus underestimating a player's workload [15]. Consequently, Ac/Dec could currently serve as more sensitive and predictive of fatigue and consistent physical performance during matches [5; 10; 11; 12; 13; 14]. Understanding the importance of Ac/Dec in football offers insights for coaches and sports scientists to tailor training to address these high-intensity actions. Acknowledging their significance in workload assessment can improve fatigue monitoring, prevent injuries, and optimize on-field performance [5; 10; 11; 12; 13; 14]. To measure Ac/Dec effectively, sports performance analysis relies on automatic position detection using global (GPS) [16] and local (LPS) [17] systems. These tools determine movement patterns during matches and training sessions [18; 19; 20; 15], guiding decisions based on player-tracking metrics [15; 21; 22]. LPS, unlike GPS, utilizes a local infrastructure [21], providing advantages such as the following [17; 20; 23]: (a) higher sampling rates, enhancing validity and reliability for team sport-specific movement patterns; (b) indoor and large stadium compatibility; (c) improved accuracy in player position detection; (d) device miniaturization, potentially enabling ball tracking; and (e) facilitating tactical analyses. Kinevon Perform LPS is a widely used sports tracking system [17] which has been used at the World Cup in Qatar (FIFA, 2022) and assessed by [PERSON] et al. [21], confirming its outstanding accuracy for player and ball tracking in team sports. Recent research on elite football players, both senior and youth, has observed signs of fatigue such as a decrease in metabolic power [24] and a decline in the ability to accelerate and decelerate as the match progresses, varying by player position [1; 2; 6; 24; 25]. Most of these studies point to a decline in the second half of matches, especially greater in the last 20' of play [2; 26; 27; 28]. Ac/Dec peak in the first 15' of play, followed by a decline from 15' to 30' [1], with losses ranging from 14.9% to 21% throughout the match. After an initial increase at the beginning of the second half, the trend declines steadily [2; 10], but there is disagreement on quantifying these variables during a match. Some studies examine changes every 15' [1; 24; 26; 27; 29; 30], while others prefer 10' [14] or 5' intervals [10; 25].