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POSTER ABSTRACTS – FRIDAY, 22 MAY 2015P11.03Differences in elective response among expert and non-expert footballersJose M Moya-Morales(1), R Ovejero-Mesonero(2), A Figueiredo(3), C Lalín-Novoa(4), JCMartínez-Castrejo(5)(1) Autonomous University of Madrid, Madrid, Spain(2) Real Madrid C F , Madrid, Spain(3) FCDEF, Coimbra University, Coimbra, Portugal(4) Chelsea FC, London, UK(5) FC Porto, Porto, PortugalThe existence of continuous changes in the game situations during the competition, makes that theperceptive processes and decisional together with the execution of the appropriate answers,highlight at the moment as capacities that center the interest during the training and theinvestigation in soccer.We have developed a protocol to allowed us to appreciate the evolution of the yield of expertfootballer and non-experts before the continuous exhibition to election situations, and to know theeffect caused by the presence of perceptive and decisional situations with the necessity ofresponding to them with real actions.This application, allows to show images of game situations and to execute adjusted answers to thesame ones, allowing to register and to store the reaction times, movement time and response timeused by the footballer.Each player made 80 reps in 4 blocks. The first block like adaptation to the system that he shouldcarry out during the test. The participants were 109 subject (60 non-expert players and 49 expertolder than 19 years) and they answered to the questionnaires of RPE and perceived difficulty, aswell as to the questionnaire of personal data.We have proven that significant differences existed in reactions times, response times and theplayers’ efficiency in all blocks. The expert footballers are quicker and more efficient than nonexpertsin task of time of elective answer, being due these differences to the cognitive processesrelated with the perceptual and decisional capacities and not to those of execution.P11.04Test-retest reliability of peak speed and the critical time for recoveryHubert Mahler, C Heyde, A GollhoferAlbert-Ludwigs University Freiburg, Department of Sport and Sport Science, Freiburg, GermanyPeak speed (SPEAK) and the critical recovery time (tcrit) determined within a modified repeatedsprint ability test (RSA) seems to offer valid predictions of demanding capabilities to sprint fast andto sustain at higher running speeds during the match. Complementary, test-retest reliability ofSPEAK and tcrit were evaluated in this study. 13 male soccer players (178 ± 6.7 cm, 72.8 ± 8.3 cm,24.1 ± 1.6 y) performed modified RSA-Tests twice separated by 7 days. Test conditions werehighly standardized. The RSA-Test comprised 13 maximal 2x20 m sprints divided by a 180° turn.The recovery time between sprints decreased from 130 sec to 20 seconds. SPEAK was derived248