Unit:
Κατεύθυνση Προπονητικό πεδίοLibrary of the School of Physical Education and Sport Science
Author:
Krokidas Anastasios
Supervisors info:
Παραδείσης Γ., Επίκουρος Καθηγητής, ΤΕΦΑΑ, ΕΚΠΑ
Τσολάκης Χ., Αναπληρωτής Καθηγητής, ΤΕΦΑΑ, ΕΚΠΑ
Ζαχαρόγιαννης Η., Επίκουρος Καθηγητής, ΤΕΦΑΑ, ΕΚΠΑ
Original Title:
Η άμεση επίδραση της μεταδιεγερτικής ενεργοποίησης με πλειομετρικά άλματα στο χρόνο αντίδρασης και την επιτάχυνση
Translated title:
Acute effect of postactivation potentiation with plyometric jumps to the reaction time and acceleration
Summary:
Performance on reaction time and the first meters of acceleration on sprint events is directly linked to the ability of power production. Ability that can be improved directly as a result of the phenomenon called Post-Activation Potentiation (PAP) which has been defined as the transient enhancement of muscle performance after a voluntary or involuntary muscle contraction. Although the beneficial application of the phenomenon has appeared in a variety of force activities, however it has not been studied in the block-start and the initial acceleration phase. Purpose of this study was to examine the direct impact of plyometric jumps under two different conditions, on block-start Reaction Time (RT) and initial acceleration in sprints, on track and field athletes who are familiar with the block-start. The twelve (12) participants have been invited to three different meetings that took place on three different days in order to participate in random order in each of the conditions of Control, Depth Jumps (DJ) and Depth Jumps with pause at 90ο (MDJ) each time. At the beginning of each of the three meetings, a predetermined standard warming up took place. The condition of Control comprised two sets of three block- starts with an intermediate six- minute rest between the initial and the final set of block- starts, without any intervention. During the other two experimental conditions, between the two sets of block-starts and at the end of the 6 minute rest, five (5) plyometric jumps DJ or MDJ from a 50 cm box were performed and has been examined whether affected the performance of the starts in 1, 3 and 5 minute after the pro-activation. With respect to the block - start reaction time, no reliability (reproducibility) has emerged between the repeated attempts, despite the contrary results of the pilot study. As a result, no significant change has occurred in none of the tree experimental conditions in both the reaction time and the performance in the first three (t3) and five meters (t5) during acceleration, despite the improvement tendency (2,3%) that showed the performance at 5 meters, 5’ after the pro-activation. Furthermore, no significant improvement has occurred regarding the kinematic characteristics such as contact time, flight time and the stride length during the first strides in the initial phase of acceleration under none of the experimental conditions.
Keywords:
post-activation potentiation, muscle power, plyometric jumps, track & field, sprint events, block start, reaction time, acceleration phase
Number of references:
178
