## 4 Discussion
The analysis of the distance travelled in the different speed zones does not follow the same methodological definition due to the differences in the definition of the speed ranges used in the studies. These differences are based on the creation of the speed ranges through the maximum speed of each player, as [PERSON] et al. [8] establish 18.1 km\(\cdot\)h\({}^{-1}\) as the maximum speed following the studies of [PERSON] et al. [18]. [PERSON] and [PERSON] [9] establish the limit at 15 km\(\cdot\)h\({}^{-1}\) based on the previous results obtained in their own study. The present investigation follows a similar methodology to [PERSON] and [PERSON] [9] when obtaining a maximum speed during the competition of 15.77 \(\pm\) 1.57 km\(\cdot\)h\({}^{-1}\). The study of the distance in the speed zones indicates how, in zones 2 and, 4 the greater distance travelled by the players is obtained, describing the kinematic demands of an intermittent discipline with two differentiated work speed zones. The study of the distance travelled in the game sets reports significant differences between the first and the second set in zones 3 and 4. In the same line of research, although with different speed zones, [PERSON] et al. [8] show significant differences in the distances covered at low intensity (zone 1) between the first and second sets. However, the two most representative intensity zones (2 and 4), which account for 83.1% of the total distance covered, show the intermittence of this discipline, favored by the unlimited substitutions of the players during each set and the short duration of the sets. The influence of the playing period on the performance of the players has been studied in other sports, such as futsal [47; 48], basketball [49], rugby 7 [50; 51], hockey [52; 53], and handball [54], with the aim of studying the effect of fatigue on the physical demands of players during competition. A differentiation of beach handball compared to other collaboration-opposition sports that use common space and simultaneous practice would be the regulatory conditioner with respect to the final score that is determined by the independence of the result of each set. This aspect will be a key factor in determining the fatigue of the players. In the present study, the analysis of fatigue during the match showed a reduction in the total distance between the first and second sets of a 9.5% difference, in the distances covered in zone 3 with a 14.9% difference in the 1 st and 2 nd sets, and in zone 4 with a 13.6% difference in the 1 st and 2 nd sets. In addition, in the V\({}_{\text{MEAN}}\), there was an 8.2% difference between sets. [PERSON] et al. [8] continue this line of work and their results coincide with the present article, since, in the second set, the distance travelled at low intensity is significantly lower than that travelled in the first set, while the distance travelled at high intensity does not reveal differences between both sets. At the internal load level, the variables HR\({}_{\text{MAX}}\) 193.58 \(\pm\) 10.68 and HR\({}_{\text{MEAN}}\) 166.44 \(\pm\) 14.6 of the present study coincide with the results presented by [PERSON] and [PERSON] [9], where it is observed that beach handball is a high-intensity discipline where the longest activity time is accumulated above 80% of the HR\({}_{\text{MAX}}\) (62.82 \(\pm\) 14.73%). Previous studies show a similar distribution in relation to the accumulated time in the different intensity zones, highlighting the intermittent nature of this sport [55]. [PERSON] et al. [56], define the valid tools to monitor fatigue and propose the evaluation of vertical jumps as an easy tool to administer with minimal fatigue in its execution, following the line of research in other disciplines, such as athletics [26], football [57], or basketball [58], where the jump test (CMJ) has been used as a predictor of performance or fatigue. Furthermore, the importance of this action in the performance of beach handball players shows the need to evaluate the effect of fatigue on the jumping ability of athletes.