## 4 Discussion
In the reviewed studies, it is observed that sports classes with lesser impairment (FT3-FT2 and FT8-FT7) exhibit higher values of accelerations and decelerations compared to FT1 and FT5/6 classes [28; 30; 31; 32]. This trend can be attributed to greater neuromuscular impairment, poorer coordination, and reduced functional capacity resulting from spasticity, ataxia, atheosis, dyskinesia, or dystonia [6]. In addition, this difference is conditioned by playing time, which significantly affects the external load of PC players since those who play more minute's (i.e., <20, 20-40, and <40 min) experience a higher match load [18]. Additionally, regarding Metabolic Power, Player Load, and change of direction, no significant differences were observed between sport classes [30; 31; 32]. While the present review provides novel outcomes in physical and physiological match-play load in CP footballers, the limitations of our findings should be acknowledged, therefore, the results should be interpreted with caution. Firstly, studies included in this systematic review are subject to different classification systems for para-footballers, which has made it impossible to relate the variation in physical and physiological responses during official matches from all the studies, according to the same sport classes. This limitation can likely persist over time, considering that the classification process is dynamic and subject to continuous and necessary changes to ensure competitive equality. Secondly, it is difficult to establish a consensus regarding physical and physiological responses during match-play, as the competitive levels included in this review are different. In this sense, while some studies have reported data from national championships, others have focused on international championships. Thirdly, only one study has analyzed the physiological responses according to the sport classes of different classification systems. As such, it is impossible to compare the results obtained. Fourth, the speed ranges and thresholds for accelerations and decelerations vary among studies, making it challenging to compare them. Lastly, given that all the studies are carried out in male competitions, and considering that gender determines the physical responses of competition in conventional soccer [49], and the participation of women football players with CP and the organization of different events is becoming relevant, it would be necessary to analyze this aspect in future studies. We acknowledge that subsequent to the completion of our review process, additional relevant studies have been published. While our review was conducted up to 31 January 2023, we are aware of the inclusion of one additional study that was not part of our original review [50] (online, ahead of print). Despite our efforts to capture all relevant literature available at the time of our review, the dynamic nature of research in this field may result in the emergence of new studies post-review. Strength and conditions coaches, along with performance staff, working across parafootballers with CP must know what the physical and physiological demands of match-play are. Previous studies have analyzed competition demands based on different contextual variables, such as moderate altitude [29], sport classes [32], simulated games [29], or even in a 3-day national tournament [35]. However, to our knowledge, this is the first systematic review to analyze the physical and physiological responses encountered by para-footballers with CP during the competition, according to sport classes. This knowledge is essential for adequately preparing athletes for competition and simulating competition situations during training tasks.