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Two experimental conditions: A quiet standing and B ju-jitsu combat stance

Two experimental conditions: A quiet standing and B ju-jitsu combat stance

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Abstract Background Due to the high postural control demands of sport ju-jitsu, it is likely that long-term sport ju-jitsu training may induce sport-specific adaptations in postural control, especially in positions directly related to combat. The aim of the study was to assess the differences in postural control between elite sport ju-jitsu athlete...

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... Consider first the entropy, which was rather unexpectedly lower in VOL, i.e., showed a less irregular temporal structure of the HGRF time-series than in CON. Most studies using this measure to assess COP dynamics claim that increased, not decreased, irregularity indicates beneficial changes in postural control 9,24,25 . However, there is no shortage of authors who recognize the inverse relationship, i.e. indicate improved (or better) stability at lower entropy values 26,27 . ...
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A comprehensive explanation of the relationship between postural control and athletic performance requires compare body balance in athletes with their never training counterparts. To fill this gap in relation to volleyball, the aim of this study was to compare the balance of intermediate adolescent female players (VOL, n = 61) with inactive peers (CON, n = 57). The participants were investigated in normal quiet stance during 20 s trials on a Kistler force plate. The traditional spatial (amplitude and mean speed) and temporal (frequency and entropy) indices were computed for ground reaction forces (GRF) and center-of-pressure (COP) time-series. The spatial parameters of the both time-series did not discriminate the two groups. However, the temporal GRF parameters revealed much lower values in VOL than in CON (p < .0001). This leads to three important conclusions regarding posturography applications. First, GRF and COP provide different information regarding postural control. Second, measures based on GRF are more sensitive to changes in balance related to volleyball training and perhaps to similar training and sports activity regimens. And third, the indicators calculated based on these two time series can complement each other and thus enrich the insight into the relationship between balance and sports performance level.
... Historically, it is the "ancestor" of many martial arts disciplines, and it was the basis for the development of Judo and Aikido, among others [2]. The philosophy of Ju-Jitsu is multidimensional and assumes the comprehensive development of a person's physical and psychological aspects, in areas such as motor skills, psychology, technical-tactical, and utility [3]. 2 of 14 In the sporting dimension, Ju-Jitsu as direct combat in the fighting formula is a cross-sectional and complete martial arts discipline, showcasing a rich range of technicaltactical training [4]. Specialized combat techniques are used in the fight, including various strikes with the upper limbs, kicks with the lower limbs, throws, takedowns, limb locks, chokes, and restraining positions. ...
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... Consider first the entropy, which was rather unexpectedly lower in VOL, i.e. showed a less irregular temporal structure of the HGRF time-series than in CON. Most studies using this measure to assess COP dynamics claim that increased, not decreased, irregularity indicates beneficial changes in postural control (Akbaş et al., 2022;Piątek-Krzywicka et al., 2022;Terada et al., 2018). However, there is no shortage of authors who recognize the inverse relationship, i.e. indicate improved (or better) stability at lower entropy values (Hadad et al., 2020;Raffalt et al., 2021). ...
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Full-text available
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