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Modelling and analysis of lower limb joint loads during the Naeryo chagi technique in taekwondo

100%

Górski M., Lekszycki T., Buśko K., Mazur-Różycka J.

Biomedical Human Kinetics

2014

vol. 6

issue 1

Study aim: estimate reaction forces and muscle torque in lower limb joints during the Naeryo chagi technique in taekwondo. Material and methods: the parameters of the Naeryo chagi kick were measured with a Vicon motion tracking system comprising ten MX T40S cameras, two reference cameras and four AMTI BP600900-2000 force plates. Additional measurements were performed using the BTS-4AP-2K force analysis system equipped with a WB-4AP punching bag. The acquired raw data were processed and synchronized using Matlab v.R2007a software. A computer simulation created on the basis of the adopted mathematical model was used to identify reaction forces and control moments. Results: the highest joint loads occurred at the moment when the striking leg reversed its movement direction from rising to rapidly falling towards the target. The knee and ankle joints of the supporting leg were subject to greatest reaction forces and muscle torque. Conclusions: it is recommended to follow an exercise routine aimed at strengthening and stabilizing the structures of motor system subject to the greatest load.

Knowledge of students of selected fields of study on specific eating disorders

76%

Górski M., Całyniuk B., Garbicz J., Szynal K., Górska K., Polaniak R.

Annales Academiae Medicae Silesiensis

2023

issue 77

67-74

INTRODUCTION: Eating disorders comprise a dynamically developing group of psychiatric disorders. They are characterized by a pathological way of food intake and disturbances in the feelings of hunger and satiety. The clinical picture is dominated by destructive eating behaviours, an abnormal self-image and obsession with controlling body weight. The aim of the study was to assess the knowledge about anorexia nervosa (AN) and bulimia nervosa (BN) among students of selected faculties. MATERIAL AND METHODS: The group of respondents consisted of students of medicine, dentistry, dietetics and psychology. The questionnaire study included 955 respondents (799 women and 156 men). The probability level of 0.05 was assumed in the statistical analyses. RESULTS: More than 85% of the respondents correctly indicated the definition of AN and BN. The knowledge of the risk factors, complications, or diagnostic criteria for these conditions ranged 20–60%. The medical and psychology students had the highest level of knowledge. The respondents who had a history of eating disorders had a higher level of knowledge than those who had never suffered from them. CONCLUSIONS: The knowledge of eating disorders among medical, medical-dental, dietetics and psychology students is selective and insufficient to work with patients with eating disorders. This suggests the need for ongoing education in the researched aspect.

WSTĘP: Zaburzenia odżywiania to dynamicznie rozwijająca się grupa zaburzeń psychicznych. Charakteryzują się patologicznym sposobem przyjmowania pokarmu oraz zaburzeniami w odczuwaniu głodu i sytości. W ob-razie klinicznym dominują destrukcyjne zachowania żywieniowe, nieprawidłowy obraz własnego ciała oraz obsesja dotycząca kontrolowania masy ciała. Celem pracy była ocena wiedzy na temat jadłowstrętu psy-chicznego (anorexia nervosa – AN) i żarłoczności psychicznej (bulimia nervosa – BN) wśród studentów wybra-nych kierunków studiów. MATERIAŁ I METODY: Grupę respondentów stanowili studenci kierunków lekarskiego, lekarsko-dentystycznego, dietetyki i psychologii. Badaniem kwestionariuszowym objęto 955 respondentów (799 kobiet oraz 156 mężczyzn). W analizach statystycznych przyjęto poziom prawdopodobieństwa 0,05. WYNIKI: Ponad 85% badanych prawidłowo wskazało definicję AN i BN. Wiedza na temat czynników ryzyka, powikłań czy kryterium diagnostycznego tych schorzeń wahała się w zakresie 20–60%. Największą wiedzę posiadali studenci kierunków lekarskiego oraz psychologii. Respondenci, którzy chorowali w przeszłości na zaburzenia odżywiania, posiadali większą wiedzę niż osoby nigdy na nie niechorujące. WNIOSKI: Wiedza na temat zaburzeń odżywiania wśród studentów kierunków lekarskiego, lekarsko-dentystycznego, dietetyki oraz psychologii jest wybiórcza i niewystarczająca do pracy z pacjentami chorującymi na zaburzenia odżywiania. Sugeruje to konieczność stałej edukacji w badanym aspekcie.

Comparison of two boxing training simulators

76%

Buśko K., Staniak Z., Łach P., Mazur-Różycka J., Michalski R. M., Górski M.

Biomedical Human Kinetics

2014

vol. 6

issue 1

Study aim: the aim of the study was to compare two methods for measuring punching and kicking force and the reaction time of athletes. Material and methods: both systems were designed to measure and to analyse the mechanical characteristics of punches and strikes delivered by upper and lower limbs to a punching bag. The main difference between both punching bags was the way in which the delivered force was measured. The first method used strain gauges while the second method used accelerometer technology. Both systems consisted of a punching bag with software, attached signal diodes, and either embedded accelerometers or strain gauges. The bags were of different sizes. Acceleration transducers and gyroscopes or strain gauges were placed inside the punching bags, which allowed for measuring dynamics while the bag was struck. The software calculated strike force, the point of force application and its direction, and reaction time. Both systems were tested. Results: the results of the accelerometer-based method show that the mean relative error of force calculation amounts to 3%. The measurement error of acceleration is less than 1%. The mean relative measurement error of the striking surface on the punching bag is 2%. However, the measurement error of force recorded with the strain gauge-based method is less than 1%. The results show that both systems are similar. Conclusions: the punching bag having an embedded accelerometer is equipped with more versatile software, which makes the system a good tool for practical application in combat sport training.

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2 Biomedical Human Kinetics

1 Annales Academiae Medicae Silesiensis

1 2023

2 2014

3 Górski M.

2 Buśko K.

2 Mazur-Różycka J.

1 Całyniuk B.

1 Garbicz J.

1 Górska K.

1 Lekszycki T.

1 Michalski R. M.

1 Polaniak R.

1 Staniak Z.

1 Szynal K.

1 Łach P.

Search results

Modelling and analysis of lower limb joint loads during the Naeryo chagi technique in taekwondo

Knowledge of students of selected fields of study on specific eating disorders

Comparison of two boxing training simulators