Exercise Dependence in Practitioners of Martial Arts and Combat Sports.

BACKGROUND: The aim of this study was to analyse prevalence exercise dependence among practicing martial arts and combat sports. METHODS: There were 166 respondents. The Exercise Dependence Scale-EDS was used. RESULTS: The martial arts practitioners obtained a lower result in the 'intention effects' (p < 0.05; η2 = 0.03), 'continuance' (p = 0.04; η2 = 0.03), 'lack of control' (p < 0.05; η2 = 0.03), 'reduction in other activities' (p = 0.04; η2 = 0.03), and 'total score' (p = 0.04; η2 = 0.03) than the combat sports athletes. Both the respondents with a high training rank (p < 0.05) and subjects with above 5 years of training experience (p = 0.03; η2 = 0.03) achieved the higher mean in the 'time' subscale. Women obtained lower results in the case of 'tolerance' (p = 0.04; η2 = 0.04). The regression coefficient indicates that the higher respondent's age, the lower total score she/he will achieve in the EDS. CONCLUSIONS: The findings have practical implications for identifying subjects 'at-risk for exercise dependence' symptoms, and may aid coaches and individuals in the implementation of a prevention program, to seek suitable support.

Stress Responses to One-Day Athletic Tournament in Sport Coaches: A Pilot Study.

BACKGROUND: Watching athletic tournaments induces emotional and physiological responses in sports fans and coaches. The aim of the study was to investigate hormonal and cardiovascular responses in judo coaches observing the fights of their athletes during one-day, high-level tournaments. MATERIAL AND METHODS: We studied the biological responses of a group of seventeen judo club coaches between the ages of 39 and 57 years to a one-day judo tournament attended by the adult male and/or female athletes that they coached. At the time of the tournaments and also in neutral conditions, the coaches' capillary blood and saliva samples were collected concurrently two times a day, both at 7:30 a.m. and after completion of the tournament (at about 8:00 p.m.). Cardiovascular parameters were also determined at the same times of day. Sleep quality (SQ) was assessed on a 6-point scale both on the night preceding the tournament and in neutral conditions. Cortisol (C) and testosterone (T) levels were determined from serum and saliva samples. The results for both days at different times of day were compared. RESULTS: Statistical calculations showed higher concentrations of cortisol and a greater reduction of testosterone levels in serum and saliva at the end of the day during the tournament compared with those on a neutral day. Morning and evening cardiovascular indices were higher during the tournament. CONCLUSION: The study showed that during one-day tournaments, judo coaches were exposed to stress that induced intermittent hormonal changes in blood and saliva and activated the autonomic nervous system.

Personality and Age of Male National Team of Ukraine in Kyokushin Karate-Pilot Study.

This article is a continuation of the research on personality in combat sports in karate. The authors' goal was to verify the relationship between personality and age of kyokushin karate practitioners. The male national team of Ukraine in karate kyokushin (N = 7) participated in the personality study with the use of the Big Five model. The NEO-FFI (NEO Five-Factor Inventory) Personality Questionnaire was applied as a research tool and the package of statistical methods IBM SPSS Statistics 27.0 (IBM Polska, Warszawa, Poland) was used to compute the research results. The study showed that there were differences in the intensity of openness to experiences between individual samples only at the level of the statistical trend. Masters showed a higher level of openness to experiences in relation to juniors (p = 0.081) and seniors (p = 0.097). Also, a negative and strong correlation between the intensity of neuroticism and conscientiousness among the respondents was noted. A conclusion was drawn that, with age, karatekas probably manifest greater openness to experience, which is the result of their sports experience, high sports level and pro-health values of karate. On the other hand, good emotional adaptation of karatekas is strictly related to conscientiousness.

Correlations between the EMG Structure of Movement Patterns and Activity of Postural Muscles in Able-Bodied and Wheelchair Fencers.

The study involved Paralympic wheelchair fencers (N = 7) in two disability categories, and able-bodied female epee fencers (N = 7), members of the polish paralympic fencing teams. The performance of postural muscles and sword arm muscles in both groups of fencers, and of the front and rear leg muscles in the able-bodied fencers, was examined using surface electromyography with an accelerometer and the OptiTrack motion analysis system, as well as ground force reaction platforms. The activation sequence of individual muscles was determined and the structure of movement patterns in able-bodied and wheelchair fencers was formulated. A statistically significant correlation was found between the complex motor reaction time and latissimus dorsi muscle activation (p = 0.039, Z = -2.062) in wheelchair fencers. High correlations between the vertical force and EMG signal values of the gastrocnemius caput laterale muscle (0.85 for p = 0.022) were found in able-bodied fencers. A heuristic analysis indicated the significance of postural muscles in the movement patterns of wheelchair and able-bodied fencers. These muscles play a crucial role in the anticipatory postural adjustment of the trunk during technical fencing actions, including attacks on the opponent's body.

Evaluation of the Level of Technical and Tactical Skills and Its Relationships with Aerobic Capacity and Special Fitness in Elite Ju-Jitsu Athletes.

BACKGROUND: Ju-jitsu training has to be comprehensive in terms of training intensity, developing a wide range of physical fitness and learning multiple technical skills. These requirements result from the specificity of the competition characteristic of the sport form of this martial art. The aim of this study was to evaluate the aerobic capacity and special physical fitness of ju-jitsu athletes at the highest sports performance level and to determine the relationships between special fitness and the indices of technical and tactical skills. METHODS: In order to determine the current level of special fitness of the athletes, a set of karate fitness tests were used, namely, the Special Judo Fitness Test and the Kickboxer Special Physical Fitness Test. Furthermore, maximal oxygen uptake (VO2peak) was measured using a graded exercise test in a group of 30 sport ju-jitsu athletes at the highest level of sports performance. To evaluate the level of technical and tactical skills, an analysis of recordings of tournament bouts was carried out, and, based on the observations, the indices of effectiveness, efficiency, and activeness of the attack were calculated. RESULTS: Individuals with higher fitness were more active and effective in the attack. The special efficiency indices showed significant correlations with the technical and tactical parameters. Better fighting performance was dependent on the speed of the punches, kicking range, and the results of the special fitness tests. CONCLUSIONS: To achieve greater efficiency and effectiveness of sport ju-jitsu, the training process should be based on comprehensive motor development and an optimal level of special fitness.

Characteristics of Technical and Tactical Preparation of Elite Judokas during the World Championships and Olympic Games.

The basis for achieving success in sport is technical preparation supported by adequate level of physical fitness. During judo competitions, athletes use technique to meet tactical objectives aimed to achieve victory. The modification of the rules of combat in judo that has been carried out in recent years has changed the course of competition. It seems to be interesting if there are relations between technical and tactical preparation expressed by means of indices and modification of the course of the fight caused by changes in the rules. The purpose of the paper was to determine the values of technical and tactical preparation of judokas during competition at the elite level. A hundred and twenty bouts during the Olympic Games in London in 2012 as well as 136 bouts fought during the World Championships in Rio de Janeiro in 2013 were analyzed. Verification was performed by calculating indicators of technical and tactical preparation. The results show a significant correlation between the indicators of technical and tactical preparation and the ranking in the general classification of the analyzed competitions. There were no statistically significant correlations between the change of fighting rules and the level of the examined indices of technical and tactical preparation. The results of the study verified the appropriate method of preparation for the competitions analyzed.

Indicators of Targeted Physical Fitness in Judo and Jujutsu-Preliminary Results of Research.

(1) Study aim: This is a comparative study for judo and jujutsu practitioners. It has an intrinsic value. The aim of this study was to showcase a comparison of practitioners of judo and a similar martial art jujutsu with regard to manual abilities. The study applied the measurement of simple reaction time in response to a visual stimulus and handgrip measurement. (2) Materials and Methods: The group comprising N = 69 black belts from Poland and Germany (including 30 from judo and 39 from jujutsu) applied two trials: "grasping of Ditrich rod" and dynamometric handgrip measurement. The analysis of the results involved the calculations of arithmetic means, standard deviations, and Pearson correlations. Analysis of the differences (Mann-Whitney U test) and Student's t-test were also applied to establish statistical differences. (3) Results: In the test involving handgrip measurement, the subjects from Poland (both those practicing judo and jujutsu) gained better results compared to their German counterparts. In the test involving grasping of Ditrich rod, a positive correlation was demonstrated in the group of German judokas between the age and reaction time of the subjects (rxy = 0.66, p < 0.05), as well as in the group of jujutsu subjects between body weight and the reaction time (rxy = 0.49, p < 0.05). A significant and strong correlation between handgrip and weight was also established for the group of German judokas (rxy = 0.75, p < 0.05). In Polish competitors, the correlations were only established between the age and handgrip measurements (rxy = 0.49, p < 0.05). (4) Conclusions: Simple reaction times in response to visual stimulation were shorter in the subjects practicing the martial art jujutsu. However, the statement regarding the advantage of the judokas in terms of handgrip force was not confirmed by the results.

Polish publications on jujutsu (1906-2020): bibliometric analysis / Publicações polonesas sobre jiu-jítsu (1906-2020): análise bibliométrica / Publicaciones polacas sobre jujutsu (1906-2020): análisis bibliométrico

Abstract The aim was to perform a bibliometric analysis of Polish jujutsu publications focused on productivity, topics, and collaboration. Thus, the National Library of Poland, Polish Scientific Journals Database, Web of Science and Scopus were consulted. Results were filtered and exported to Excel 2016 for statistical analysis. 123 Polish jujutsu documents were published from 1906 to 2020. Life Sciences had the highest representation, while collaboration predominated during the last decade. Cynarski was the most productive author, while Wojdat achieved the highest collaboration index. Ido Movement for Culture was the main source for disseminating these publications. In conclusion, technical books written by single authors from a Life Sciences approach prevailed in Polish jujutsu publications during the 20th century, while scientific articles written in collaboration and also representing other approaches have prevailed in the 21st century.

Resumo O objetivo foi realizar uma análise bibliométrica das publicações polonesas sobre jiu-jítsu com foco nos aspectos de produtividade, assuntos e colaboração. Assim, a Biblioteca Nacional da Polônia, a Base de Revistas Científicas Polonesas, Web of Science e Scopus foram consultados. Os resultados foram filtrados e exportados para o Excel 2016 para análise estatística. Os documentos poloneses sobre jiu-jítsu chegaram a 123 publicados entre 1906 e 2020. Ciências da Vida foi o campo mais representado, enquanto a colaboração prevaleceu durante a última década. Cynarski foi o autor mais produtivo, enquanto Wojdat teve a maior taxa de colaboração. Ido Movement for Culture foi o principal divulgador dessas publicações. Em conclusão, as publicações polonesas sobre jiu-jítsu mostraram durante o século XX uma predominância de livros técnicos escritos por autores individuais a partir de uma abordagem das Ciências da Vida, enquanto os artigos científicos escritos em colaboração e também representando outras abordagens dominaram o século XXI.

Resumen El objetivo fue realizar un análisis bibliométrico de las publicaciones polacas sobre jujutsu centrado en los aspectos de productividad, asuntos y colaboración. Así, se consultaron la Biblioteca Nacional de Polonia, la Base de Revistas Científicas Polacas, la Web of Science y Scopus. Los resultados fueron filtrados y exportados a Excel 2016 para el análisis estadístico. Los documentos polacos sobre jujutsu alcanzaron los 123, publicados entre 1906 y 2020. Ciencias de la Vida fue el campo más representado, mientras que la colaboración predominó durante la última década. Cynarski fue el autor más productivo, mientras que Wojdat obtuvo el índice de colaboración más alto. Ido Movement for Culture fue el principal divulgador de estas publicaciones. En conclusión, las publicaciones polacas sobre jujutsu mostraron, durante el siglo XX, un predominio de libros técnicos escritos por autores individuales desde un abordaje de las Ciencias de la Vida, mientras que los artículos científicos escritos en colaboración y representando también otros enfoques han dominado en el siglo XXI.

The Effects of Intermittent Hypoxic Training on Anaerobic and Aerobic Power in Boxers.

BACKGROUND: The aim of the study was to evaluate the effects of intermittent hypoxic training (IHT) on anaerobic and aerobic fitness in elite, national boxers. METHODS: The study was conducted over a period of 6 weeks. It comprised 30 national championship boxers, divided into 2 groups: the experimental and control. Both groups performed the same boxing training twice a day (morning and afternoon training). In the afternoon, the experimental group performed training under normobaric conditions in a hypoxic chamber (IHT), while the control group undertook exercise in standard normoxic conditions. In both groups, before and after the 6-week programme, basic anthropometric indices as well as anaerobic (Wingate Test) and aerobic (graded test) fitness were assessed. RESULTS: There was a significant increase in anaerobic peak power (988.2 vs. 1011.8 W), mean anaerobic power (741.1 vs. 764.8 W), total work (22.84 vs. 22.39 kJ), and a decrease in fatigue index (20.33 vs. 18.6 W·s-1) as well as time to peak power (5.01 vs. 4.72 s). Such changes were not observed in the control group. In both groups, no significant changes in endurance performance were noted after the training session - peak oxygen uptake did not significantly vary after IHT. CONCLUSIONS: Our results have practical application for coaches, as the IHT seems to be effective in improving anaerobic performance among boxers.

Effect of Aging on the Lower Limb Kinematics in Karate Practitioners: Comparing Athletes and Their Senseis.

With the life expectancy increasing, older adult population has gained the attention of many researchers. Aging is known to lead to a general decline in bodily functions, which affect the quality of life. The aim of this study was to analyze how the aging process affects veteran active karate practitioners, in the kinematic and temporal structure of the frontal kick. Nine black belt karate practitioners over 50 years old and 24 black belt karate practitioners, aged between 20 and 30 years old, all male, performed the frontal kick mae-geri. Results showed that knee is the structure that holds most differences between young and veterans, both for linear and for angular variables during the mae-geri performance. Statistical differences were found in linear velocity for the knee; linear acceleration of the knee, hip, and RASIS; maximum angular velocity for knee and hip; maximum angular acceleration for ankle and hip; and in the range of motion of knee. The temporal variables show differences, between groups, in maximum linear velocity, maximum linear acceleration, and maximum angular acceleration. However, no differences were found between groups for the time before contact in the maximum linear and angular acceleration, which allow us to remark both the effects of the aging process and the effect of training. This study corroborates the ability of older people to achieve benefits from sports practice, achieving higher efficiency than the younger adults in task execution, but using different motor control strategies.