جستجوی مقالات مرتبط با کلیدواژه "کومیته" در نشریات گروه "تربیت بدنی"

With regard to the effects of postural fatigue on the amount of participation in sport activities and as this may result in impaired motor functioning, the aim of this study was to investigate the effect of fatigue on static and dynamic balance in karate kata and kumite elite men.
The statistical population consist of all karate kata and kumite National Karate team members in 2015-16, which involved 20 men. The sample of the study included 16 athletes with average age of 20.4 ± 23.75 years, all of whom were healthy. Static and dynamic balance was measured before and after the exercise protocol, including a severe karate training session. Static postural stability indices including mean center of pressure displacement (COP) and velocity of COP displacements (COP VEL) Direction of medial-lateral (ML) and anterior-posterior (AP), were measured in standing position on one leg. In order to evaluate the dynamic postural stability index (DPSI), the jump-landing task was used on the 1000-Hz Kistler force plate. Inferential statistics which were used to compare pre and post-test data in order to compare the effect of fatigue in kata and kumite groups at a significant level of 0.05, including paired samples t-test and covariance analysis.
The findings indicated that fatigue caused by intense training would significantly affect the static and dynamic balance in karate kata and kumite elite men (P Based on the results of the study, it can be recommended that coaches and athletes consider the negative effects of fatigue in intensive training sessions on static and dynamic balance. Since practically there is not much differences between different exercise in kata and kumite. It is recommended that the exercise program be used to delay fatigue in order to reduce the risk of musculoskeletal damage.

Nowadays, numerous studies have shown that optimal athletic performance is related to many psychological factors. This paper aimed at comparing motivation and perfectionism of successful and unsuccessful karate athletes in Iran men’s karate super league. This study was casual-comparative and the population consisted of karate athletes of Iran men’s karate super league in 2015 in Kumite section. Primary data were collected by convenience sampling method from 70 athletes of all participating teams (especially two high ranking teams and three low-ranking teams) in karate super league. After collecting the data of the number of competitions and their results for each athlete, the optimal performance of karate athletes was calculated and two successful and unsuccessful groups were determined (each group 30 subjects). The demographic questionnaire, the sport motivation scale, and the sport perfectionism scale were used in this study. The K-S and Shapiro-Wilk tests were used to investigate the natural distribution of data. The results of independent t test showed a statistically significant difference in adaptive perfectionism (positive) between successful and unsuccessful athletes. However, there was no significant difference in maladaptive perfectionism (negative) between the two groups. Furthermore, the Mann-Whitney U test results showed that the difference in all motivation subscales was not significant between successful and unsuccessful karate athletes. Finally, it can be stated that some findings emphasize the role of psychological characteristics in sport success and performance in the two groups which have in the highest rank of Asian and world karate.

The aim of this study was to compare the plantar pressure distribution of dominant and non-dominant legs of females who were participated in the kata and kumite national team.
Twelve kumite and 8 kata female athletes of the Karate national team participated in this study. Plantar pressure was measured using emed platform during barefoot walking. After dividing the foot into 10 masks, peak pressure, pressure-time integral, maximum force and force-time integral were calculated. Wilcoxon and U-Mann-Witney tests were used to analyze parameters at a significance level of p ≤ 0.05.
In comparison of kata and kumite teams it was found that, kata plantar pressure parameters in Metatarsal-2 (p=0.05) and Metatarsals-3, 4, 5 (p=0.04) were significantly less than those in kumite. Also, in comparison of dominant and non-dominant leg, plantar pressure parameters of dominant leg were less in Metatarsal-2 (p=0.04) and more in Bigtoe (p=0.04) and Toes-3, 4, 5 (p=0.03) than those in the non-dominant leg.
Results may be indicative different of natures of the two athletic fields in that Kumite has a higher impact on plantar pressure due to higher mechanical loads. Furthermore, the unequal use of the legs may affect plantar pressure because of leg dominance. Thus, further and more comprehensive studies are necessary to prevent exercise-induced adaptations in professional levels and their treatments.

The aim of this study was to compare the balance(dynamic and static) and reaction time(simple and choice) in national elite male Kata and Kumite players and related profile form. For this reason 30 national elite male karate players(15 athletes from Kata and 15 athletes from Kumite) were randomly selected. Study design was the causal comparative research. For the evaluation of static, dynamic balance and simple & choice reaction time used the stork, SEBT and four directional systems respectively. Descriptive and inferential test used for statistical analysis. Independent t-test used for the data analysis in level (P≤0.05). The results showed that: The Kata players had better static balance than Kumite player (P=0.001). And the Kata players had better dynamic balance than Kumite player(P=0.001). Also the Kata and Kumite players were equal in simple reaction time(P=0.652). At least the Kata and Kumite players were equal in choice reaction time(P=0.126). Finally we found that the balance is more important to Karate athletes than reaction time for choice between Kata and Kumite.