ARTICLE | doi:10.20944/preprints201710.0063.v1
Subject: Medicine And Pharmacology, Orthopedics And Sports Medicine Keywords: Anaerobic Threshold; Martial Art; Sport
Online: 10 October 2017 (15:07:56 CEST)
Then the purposes of this study were to compare and correlate the aerobic threshold (THaer) and anaerobic threshold (THanaer) measured during a new single judo specific incremental test and Treadmill Test for aerobic demand evaluation. Eight well-trained male competitive judo players (24.3±7.9 years; height of 169.3±6.7cm; fat mass of 12.7±3.9%) performed a maximal incremental specific test for judo mimicking the UchiKomi drills and on treadmill in different days. There was difference between specific and general THaer (P=0.0006) as well as weak correlation for THaer (r=0.32; R2=0.1; P=0.2) and THanaer (rs=-0.31; R2=0.1; P=0.12). When correlation was applied with normalized data (percentage of peak load) we observed moderate correlation for THaer (r=0.76; R2=0.58; P=0.027), but the same was not observed for THanaer. We conclude that there is a need of THaer and THanaer evaluation through a specific test for Judo.
REVIEW | doi:10.20944/preprints202306.1519.v1
Subject: Biology And Life Sciences, Other Keywords: biomechanics; martial arts; impact force; maximum velocity
Online: 21 June 2023 (10:01:17 CEST)
Impact force and maximum velocity are important indicators of kick efficiency in fighting activities. Therefore, this systematic review compared the front kick (FK) and roundhouse kick (RK), including maximal and impact force, maximum velocity, maximum angular velocity, and execution time, at different target types and experience levels. The Web of Science, SportDiscus, and PubMed were systematically searched from January 1982 to May 2022, according to PRISMA guidelines. The normalized kicking values were compared using one-way ANOVA. Eighteen articles, including FK with a pooled sample of 113 elite men, 109 sub-elite men, and 46 novices, and 25 articles, including RK with a sample of 238 elite men, 143 sub-elite men, and 27 novice men, fulfilled the inclusion criteria. The primary findings were that the impact forces of FK were higher than RK for the novice, sub-elite, and elite groups by 47% (p<0.01), 92% (p<0.01), and 120% (p<0.01), respectively. Moreover, the maximum foot velocity of RK was faster than FK for the sub-elite and elite groups by 44% (p<0.01) and 48% (p<0.01), respectively. The Elite group had 65% (p<0.01) higher knee extension angular velocity within RK than FK, and 138% (p<0.01) higher hip extension angular velocity within FK than RK.
ARTICLE | doi:10.20944/preprints202308.1432.v1
Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: Taekwondo poomsae; action recognition; skeletal data; camera viewpoint; martial arts
Online: 21 August 2023 (07:48:57 CEST)
Issues of fairness and consistency in Taekwondo poomsae evaluation have emerged owing to the lack of an objective evaluation method. This study proposes a three-dimensional (3D) convolutional neural network (CNN)-based action recognition model for the objective evaluation of Taekwondo poomsae. The model exhibits robust recognition performance regardless of variation in perspective by reducing the discrepancies between training and test images. The model uses 3D skeletons of the poomsae unit action collected using a full-body motion-capture suit to generate synthesized two-dimensional (2D) skeletons from the desired perspective. This approach aids in obtaining 2D skeletons from diverse perspectives as part of the training dataset and ensures consistent recognition performance regardless of the viewpoint. The model was trained using 2D skeletons projected from diverse viewpoints, and its performance was evaluated using various test datasets, including projected 2D skeletons and RGB images captured from various viewpoints. Comparison of the performance of the proposed model with that of previously reported action recognition models demonstrated the superiority of the model, underscoring its effectiveness in recognizing and classifying Taekwondo poomsae actions.
ARTICLE | doi:10.20944/preprints202309.1609.v1
Subject: Arts And Humanities, Other Keywords: lucid dreaming practice; creativity; insights; martial arts; sport; interview; qualitative; lucid dreaming
Online: 26 September 2023 (02:52:24 CEST)
Lucid dreaming is a dream in which one is aware that they are dreaming while dreaming as well as being able to influence the dream. It is utilized in scientific research to explore dreaming, in clinical context to treat nightmares, and in private settings to have fun, solve problems, and to train various skills. In this paper, based on an interview with a lucid dreamer, a fascinating, yet hardly described way to use lucid dreaming in sports and martial arts is presented. The dreamer used his lucid dreams to explore new movements and new possibilities in martial arts. For the interview, the guide from Schädlich and Erlacher  was used. The interviewee’s lucid dream experience is compared to interviews of other lucid dreamers and their experience and to contemporary research on lucid dreams. While the potential of lucid dreaming is explored, the interviewee also mentions the possible shortcomings of lucid dreaming.
REVIEW | doi:10.20944/preprints202306.1990.v1
Subject: Medicine And Pharmacology, Neuroscience And Neurology Keywords: judo; martial art; combat sport; open-skill exercise; brain function; physical performance; cognitive performance; old adults
Online: 28 June 2023 (10:27:53 CEST)
Judo is a popular Japanese martial art and an Olympic sport. Recently, an increasing interest has been observed in the application of judo as a multicomponent exercise, with a growing body of evidence showing that multicomponent exercise improves physical and cognitive performance in older adults. Therefore, this review highlights the benefits of judo training in preventing physical and cognitive decline in older adults. Specifically, first, this review outlines the basic characteristics of judo (philosophy, match, and training). Next, previous studies investigating the effects of judo training on physical and cognitive aspects of older adults are reviewed. Thereafter, the brain mechanisms underlying the effects of judo training in improving physical and cognitive performance are discussed. Throughout this review, judo training demonstrated some positive effects on physical (gait and balance, among others) and cognitive (memory and executive function) function in older adults. These positive effects are attributed to a variety of changes in the brain (e.g., increased neurotrophic factor expression and increased cerebral blood flow, among others), that affect different brain regions and networks both functionally and structurally. From these findings, this review concludes that judo training can be an effective way to maintain and prevent physical and cognitive decline in older adults.