2012, Volume 8, Issue 2

Differences in vertical jumping performance between untrained males and advanced Greek judokas



Georgios Zaggelidis1, Savvas N. Lazaridis1, Alexandros Malkogiorgos2, Fotios Mavrovouniotis3

1Laboratory of Coaching and Sport Performance, Department of Physical Education and Sport Sciences, Aristotle University of Thessaloniki
2Laboratory of Physical Exercise and Leisure, Department of Physical Education and Sport Sciences, Aristotle University of Thessaloniki
3Laboratory of Exercise and Physical Health, Department of Physical Education and Sport Sciences, Aristotle University of Thessaloniki


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Abstract

Background and Study Aim: Judo is categorized among events which develop apart from technical aspects many physical abilities such as explosive strength, speed and co-ordination. One representative task which involves the above mentioned abilities when performed from any athlete is the vertical jump. Purpose of this paper is to answer the question: if there are differences between untrained young males and advanced level Greek judo athletes in jumping ability in four different vertical jumping tasks.
Material and Methods: Twenty male [(10 untrained/10 advanced ones), mean age: 19.4 ± 1.6 years/ 17.3 ± 1.2 years respectively] performed squat jumps, countermovement jumps and drop jumps from 20 and 40 cm height (DJ20 and DJ40, respectively). Kinetic data for further analysis were collected by a ground mounted 40 x 60 cm force plate.
Results: Advanced young judokas presented higher scores in all examined jumping tasks compared to untrained ones, revealed shorter duration of examined contact times of all tasks and as a result better utilisation of stretch-shortening cycle mechanism. Total neuromuscular activation that adopt judokas reveals a more mature and skill dependent strategy compared to untrained ones.
Conclusions: Vertical jump does not characterizes from a technical point of view a judo athlete but it seems that performance in vertical jumping tasks is affected by the participation and years habituation to ballistic and explosive strength training. Judo specific training in advanced-level judokas improves and induces specific neuromuscular alterations as well as performance in various jumping tasks.


Key words: judo, jump, martial arts, stretch-shortening cycle