Work-to-rest ratio during three repeated judo struggles separated by short intermissions. A preliminary study

Abstract

It is known, that an exertion of high intensity leads to fatigue of working muscles and to the deterioration their physical abilities. That phenomenon was especially noted during intensive and continues effort, for instant during Wingate test. At the end of that exertion lasting 30s the value of power output is always lower as compared to that recorded as peak power, reached few second after the start. That relative, percentage of power lost is expressed as fatigue index (FI). The study showed, that peak power and the maximal accumulated O (2) deficit were highly and significantly correlated and ability to maintain power output during a 30-s cycle sprint is related to anaerobic capacity [1]. Furthermore, the lost of ma ximal power is fitted by an exponential curve [2]. Among power athletes mean FI reaches almost 49% with absolute peak power amounting over 1000 Watt, and over 12.0 W/kg after its normalization to body mass [3]. Impairment of maximal power output has been found also in successive repeated "all-out" bouts, when the length of intermissions for rest is too small to reach full state of recovery prior to the next bout. In such cases the performance levels of consecutive exertions become more and more lower, even despite of previously loading by various pharmacological enhancers [4][5][6][7][8]. Long since it has been evidenced, that rate of post-effort recovery of cellular phosphagens ( PCr, ATP) play a crucial role in a rise of ability to generate again maximal, initial power output, while the depletion of the phosphagens is responsible for temporary impairment of the power. Obviously, there are also the other metabolic and physiological factors contributing to voluntary post-effort state of fatigue and rate of recovery and to the equilibrium between those two processes. These issues are taken into consider, when scheduling interval training session [9]. During intermittent exercises work-to-rest ratio influences SummaryIntroduction. In a single full-time judo struggle played by a male player lasts 5 minutes of active work, with excluding total time of rest periods, when a referee aborts a struggle. Thus work-to-rest is the factor showing both judging and fighting style. The aim of this study was to confirm hypothesis, that severe muscle fatigue may shifts work-to-rest ratio toward a lower values.Material and methods. Six senior male judo players were grouped into three pairs, which played repeated three full-time 5-minute judo sparing matches separated by 10-minute passive intermissions. The struggles were judged by the same referee. Total time of each struggle lasted 5 minutes of active combat with stoppage time of rest periods. Additional comparable observation was conducted during official judo tournaments, where each of six judokas played at least one full-time fight.Results. For 1 st and 2 nd struggle work-to-rest period were comparable, 2.27± 0.42, n=6, while for 3 rd struggle was lower 1.60±0.07. We suspect that lower work-to-rest ratio and higher sum of rest times resulted in higher frequency...

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