Browsing by Author "Van den Tillaar, Roland"
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Item Characteristics of Very High Intensity Runs of Soccer Players in Relation to Their Playing Position and Playing Half in the 2013-14 Spanish La Liga Season.(Journal of Human Kinetics, 2019) Rivilla García, Jesús; Calvo, Luis Carlos; Jiménez Rubio, Sergio; Paredes Hernández, Víctor; Muñoz Moreno, Alejandro; Van den Tillaar, Roland; Navandar, ArchitThe objective of this study was to carry out a detailed quantitative analysis of the very high intensity runs during actual play in the 2013-2014 Spanish First Division, at a general level and according to the specific playing position and half. 380 matches of the Spanish First Division in the 2013 - 2014 season were monitored using the Mediacoach video motion analysis tool. Total distance, very high intensity (above 21 km/h) running distance and the number of runs at very high intensity of 230 players from 20 teams in the Spanish First Division were analysed. The main findings of the study were that the performance indicators at very high intensities decreased from the first half to the second half for all outfield players (covered distance: 4694 ± 538 m vs 4485 ± 437 m, sprint distance: 256 ± 72 m vs 239 ± 67 m, number of sprints: 14.3 ± 3.5 vs 13.2 ± 3.1), except the central defenders (sprint distance: 166 ± 37 vs 166 ± 40 m, number of sprints: 10.0 ± 2.1 vs 9.8 ± 3.8). Secondly, although wide defenders (9759 ± 665 m) and central midfielders (9776 ± 942 m) covered the most distance during matches, it were the wide defenders (30 ± 5), centre-forwards (28 ± 7) and wide midfielders (31 ± 8) who performed the most runs at very high intensity. Consequently, the distance they ran at these very high intensity runs followed the same pattern. Such results enable general and specific profiles by demarcation to be established based on the demands of the game at high-level competitive play.Item Effects of Consecutive Matches on Isometric Hamstring Strength, Flexibility Values and Neuromuscular Performance in Female Field Hockey Players. A Prospective, Observational Study.(Applied Sciences, 2021) Sánchez Migallón, Violeta; Moreno-Pérez, Victor; López-Samanes, Alvaro; Fernández Ruiz, Vicente; Gaos, Sofía; Díaz-Maroto, José Bernardo; Van den Tillaar, Roland; Navandar, ArchitThis study aimed to analyze the effects of match congestion in a short period on isometric hamstring strength and hip/ankle range of motion in female field hockey players. Fourteen professional female field hockey players (age: 20.0 5.4 years) played two consecutive hockey matches in 24 h and maximal isometric hamstring strength and hip and ankle range of motion were obtained before and after the first match, after the second match, and 48 h after the second match. Furthermore, locomotion patterns and ratings of perceived exertion were recorded during hockey competitions. Isometric knee flexion strength showed significantly higher values 48 h after the second match for the non-dominant limb (p 0.005, p2 = 0.19), while no differences were reported in the dominant limb (p = 0.370, p2 = 0.05). In addition, no differences were reported in the range-of-motion (ROM) variables such as the straight leg raise test or ankle dorsiflexion test (p = 0.075–0.217, p2 = 0.01–0.03). The countermovement jump height steadily increased over the matches except between post-match 2 and 48 h after post-match 2 (p < 0.001, 2 = 0.382). Two consecutive official league field hockey matches played within 24 h did not have a negative effect on lower-limb risk factors (strength, hip and ankle ranges of motion, and ratings of perceived exertion) in female field hockey players directly, but they improved 48 h after the matches. This could indicate that 48 h recovery period following matches might be ideal for female field hockey players.Item Influence of the opposition on overhead smash velocity in padel players.(Kinesilogy, 2019) Rivilla García, Jesús; Muñoz Moreno, Alejandro; Lorenzo, Jorge; Van den Tillaar, Roland; Navandar, ArchitAlthough it is well established that velocity of execution is an important performance factor in ball sports and the presence of opposition influences it, there has been no research done to date on the ball velocity in padel shots. The overhead smash is one of the most successful shots in this sport, and the present study aimed to study the effect of opposition on smash performance in semi-professional and amateur padel players. Forty-four semi-professional (n=14) and amateur (n=30) players volunteered to participate in this study. The overhead smash velocity was recorded for both groups of players with and without opposition using a radar gun. The ball velocity decreased in both groups of players in the presence of opposition (from 133.1±8.2 km·h-1 to 120.72±9.8 km·h-1 in semi-professional players; and from 124.6±9.2 km·h-1 to 104.5±10.0 km·h-1 in amateurs, p<.001). Although the semi-professional players achieved a greater velocity in both situations (p<.001) compared to amateurs, the reduction of velocity in the presence of opposition was greater in the amateurs (p<.001). The greater velocities for the semi-professional padel players could be attributed to a technical and tactical superiority due to their greater experience and higher level of competition. Simulating conditions of opposition could help reduce the velocity-precision trade-off, helping the players increase their overhead smash velocities.