著者

夏原 隆之 中山 雅雄 川北 準人 荒木 香織 市村 操一

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.67, pp.379-396, 2022 (Released:2022-05-26)

参考文献数

72

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The successful development of Transformational Leadership (TFL) theory has influenced research in organizational psychology since the 1980s. Research shows that TFL has been effective not only in the domain of business but also in the military, education, parenting, and public sectors. Sport psychology researchers became interested in TFL in the early 2000s. The TFL behaviors in sport include individualized consideration, inspirational motivation, intellectual stimulation, fostering teamwork, high performance expectation, and appropriate role modeling. The focus of the current review paper is to examine and organize research on TFL in the sport coaching literature. More specifically, the effects of coaches’ TFL behavior on the psychological and behavioral aspects of athletes are reviewed. The previous literature was organized into 7 themes: performance, training attitude, motivation, self-efficacy, cohesion, satisfaction, and psychological development. It is recommended that future research should examine the effect of TFL on desired psychological and behavioral outcomes of athletes and include it in sport coaching education.

著者

竹﨑 一真

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.64, no.2, pp.687-704, 2019-12-16 (Released:2019-12-20)

参考文献数

50

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In postwar Japan, the United States (US) could be viewed as Japan’s “significant other.” The US had a considerable cultural impact on Japan and was responsible for alterations in postwar Japanese identity. Of particular importance was the influence of the US on the popular view of body form. The postwar restructuring of Japan’s national identity included the adoption of new views of the body as a result of US influence. This study investigated the culture of male beauty/body (bodybuilding) that emerged in Japan during the postwar period of occupation, and revealed how “male beauty” consciousness was generated in relation to nationalism by focusing on (1) the social context in which “male beauty/body culture” emerged and (2) the changes in conceptions of masculinity and body consciousness. This analysis yielded the following results: (1) Bodybuilding emerged in the social context of the occupation/reconstruction period and from a masculine crisis of male feminization in Japan. It was developed by the Japan Bodybuilding Association (JBA) as part of a movement to create “new Japanese men”. (2) However, bodybuilding was criticized as being feminine, linked to homosexuality, and leading to a useless “Hercules-type” body. (3) In response to this criticism, the JBA shifted its aim from the acquisition of a burly, Herculean build to one of a healthy and functional (“Hermes-type”) body that represented harmony between the body and the spirit. The aim of this shift was to gain legitimacy for bodybuilding as a masculine act. In addition to these aims in trying to help create “new Japanese men”, the JBA also intended to legitimize male bodybuilding culture within a national context, seeking to popularize and expand its activity by criticizing the American “Hercules-type” body while promoting the “Hermes-type” body preferred in Japan. In this way, discourse concerning the legitimacy of male beauty/body (bodybuilding) culture developed in conjunction with nationalism, and created an important forum for consideration of the ideal Japanese male body form.

著者

吉本 隆哉 千葉 佳裕 為末 大 大沼 勇人 谷中 拓哉 松林 武生 杉崎 範英 礒 繁雄 山崎 一彦

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.65, pp.495-505, 2020 (Released:2020-08-26)

参考文献数

33

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This study was designed to clarify the relationships between the muscle cross-sectional area of the trunk and thigh and 400-m hurdle time in 12 young adult male athletes include a bronze medalist in the world championships (height 175.4 ± 6.0 cm, body mass 67.9 ± 5.8 kg, 400-m hurdle time 47.89―55.41 s). Crosssectional images from the origin to insertion of the trunk and thigh muscles were obtained using magnetic resonance imaging (MRI). These images were used to calculate the absolute cross-sectional areas of each muscle as indices of muscularity. Stepwise multiple regression analysis was performed to examine the association between the indices and 400-m hurdle time. This analysis produced an equation (adjusted R2 = .868) with the semitendinosus (β = −0.611, P = .001), quadratus lumborum (β = −0.300, P = .044) and adductor brevis (β = −0.395, P = .014) as the explanatory variables. It was concluded that individual differences in 400-m hurdle performance can be explained by the semitendinosus, quadratus lumborum and adductor brevis.

著者

中嶋 哲也

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.13097, (Released:2014-10-15)

参考文献数

70

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This study investigates the emergence of the concept of “sportification of judo” in Japan, focusing on the process of “student judo” in relation to the competition between the First Higher School (“Ichikoh”) and the Second Higher School (“Nikoh”) in 1918, up until formation of the Association of Judo by the Four Imperial Universities in 1928. Jigorō Kanō, the father of judo, was dissatisfied that Nikoh had overused ground techniques against Ichikoh in 1918, and in June 1924, Kodokan published a revised set of umpiring rules to control the use of ground techniques in student judo.   However, Tsunetane Oda, the manager of Nikoh judo club, criticized Kanō, and advocated that ground techniques were a valid combat method. Oda finally compromised, because Takeshi Sakuraba, one of Kanō's best pupils, refuted Oda's proposal. However, it was the first time that Kodokan had been publicly criticized by someone concerned with student judo, and this seems to have been a trigger for student judo to become independent from Kodokan.   In parallel with the emergence of the democracy movement after World War I, Judo came to be regarded as extremely outmoded, and judo practitioners began to place more emphasis on theory rather than actual competition. Kanō interceded with the Tokyo Gakusei Judo Rengōkai (Tokyo Student Judo Association, “TGJR”), and in 1924 persuaded the TGJR to let their umpire rules reflect the revised umpire rules. However, the Imperial University of Tokyo (IUT) rebelled against this movement, and left the TGJR. The IUT then appealed to each of the Imperial Universities, and held the Teidai Taikai (the Four Imperial Universities Competition, “FIUC”) to encourage nationwide spread of the Kosen Judo Taikai (National High School and Vocational School Judo Competition, which was hosted by Kyoto Imperial University, “KJT”). The Imperial University Judo Association, which hosted the FIUC, then abandoned the combat characteristics that were advocated by Kodokan, with the aim of representing judo as a “sport”.   One of the reasons why Kibisaburō Sasaki criticized Kodokan was that he had been treated coldly by Kanō and Kyūzō Mifune at the Shūki Kōhaku Shiai (a contest between two Kodokan groups) in November 1922, because he had used ground techniques frequently. Moreover, Sasaki as a member of the IUT judo club had experienced the withdrawal of the IUT from the TGJR, and the holding of the FIUC. Therefore, Sasaki criticized Kodokan while student judo was being organized. Sasaki claimed that “sportification” did not confer any new value on the principles of Kodokan judo. Kanō criticized the over-use of ground techniques by KJT and the FIUC, which lacked a combat system. However, Sasaki considered that Kanō's opinion was a long-established custom, and insisted that the FIUC was a sports competition. Thus, the claim made by Sasaki meant that the FIUC had become independent from Kodokan judo.

著者

水島 淳 広瀬 健一

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.67, pp.297-302, 2022 (Released:2022-05-11)

参考文献数

17

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Communities of practice have been applied in coach development programs around the world. The purpose of the current study was to explore the concept of community of practice, the theoretical background, the literature on community of practice for sport coaches, and the value creation process in community of practice. The findings of this study should offer some insight into how we can implement community of practice for coach learning and development.

著者

水島 淳 広瀬 健一

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.21158, (Released:2022-03-25)

著者

金堀 哲也 山田 幸雄 會田 宏 島田 一志 川村 卓

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.59, no.1, pp.133-147, 2014 (Released:2014-06-13)

参考文献数

28

被引用文献数

6 2

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The purpose of this study was to clarify the viewpoint of a well-experienced baseball coach when evaluating batting skills using kinematics indices. Method: First, three baseball coaches evaluated sixteen baseball players in their own teams. The players were divided subjectively into a first superior (FG) group and a second superior (SG) group according to batting ability. Next, the hitting motion of all sixteen players was captured using a VICON system (9 cameras, 250 Hz). We measured the speed of the batted and pitched ball, or the timing of release by the pitcher, using three synchronized high-speed cameras (250 Hz). From these kinematics data, we calculated several kinematics indices for each batter, focusing especially on the indices for motion of the lower extremities and trunk. In contrast, a well-experienced expert coach who had never met these players evaluated the hitting motion of each player using only motion films without the above kinematics indices, and similarly divided them into FG and SG. The evaluation of fourteen players agreed between the team coaches and the expert coach. The FG and the SG each comprised seven players. We analyzed these fourteen players using the kinematics indices, and clarified objectively the differences in hitting motion between the two groups. Results & Conclusions: The speed of swing, batted ball speed and physical index were approximately the same in the two groups. However, players in the FG group showed a significantly longer distance of center of gravity migration in step than those in the SG group. This might have been attributable to the hip abduction movement on the pivot side on the basis of kinematics indices (p<0.05). Moreover, players in the FG group took more time in step, and swung in a shorter time after landing on the stepped foot, relative to the players in the SG group (p<0.05). These results suggest that the well-experienced expert coaches paid particular attention to the above hitting motion rather than the speed of swing, batted ball speed and physical index as coaching points.

著者

堀内 元 中島 大貴 桜井 伸二

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.16095, (Released:2017-08-25)

参考文献数

29

被引用文献数

2 4

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The purpose of this study was to evaluate the generation, absorption and transfer of mechanical energy during baseball batting, focusing on the lower extremities and torso. The batting motion and ground reaction forces acting on each foot of 79 amateur baseball players were recorded using a motion capture system and two force plates. The joint forces and joint torques were calculated using inverse dynamics. In addition, the mechanical powers as a function of each joint torque were calculated to assess the generation/absorption of mechanical energy. The mechanical powers as a function of joint forces and joint torques acting on each segment were calculated to assess the transfer of mechanical energy. The main results were as follows:  1. In the phase from contact of the stride foot to the peak lower torso rotational velocity (lower torso acceleration phase), the mechanical energy was generated and flowed into the lower torso as a function of hip joint torque.  2. In the lower torso acceleration phase, the mechanical energy flowed out from the lower torso to the upper torso as a function of torso joint torque.  3. In the phase from the peak lower torso rotational velocity to impact (swing phase), the mechanical energy was generated and flowed into the upper torso as a function of torso joint torque.  4. In the swing phase, the mechanical energy of the bat increased rapidly, and this amount of change was significantly correlated with the bat head speed at impact.  5. Though the analysis phase, the change in the mechanical energy of the torso was small.  These results suggest that both hip joints generate mechanical energy and that the torso acts as a pathway of mechanical energy during baseball batting. In addition, the transfer of mechanical energy from the torso to the upper extremities and the bat contributes to increasing the bat head speed at impact.

著者

小野 雄大 友添 秀則 根本 想

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.17015, (Released:2017-09-27)

参考文献数

94

被引用文献数

2 5

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In recent years, the way university sports are conducted has been under discussion. In particular, there is some concern about the balance between studies and competitive activities, which is important when considering the future of university sports in Japan. As no previous research has focused on sports recommendation admissions to universities in Japan, the present study first attempted to clarify the way in which this system has developed.  The following findings were obtained:  1. In Japan, even before the recommendation admission system was officially approved, athletes had been given preferential treatment in entrance examinations, which was not disclosed to the public or stipulated in application guides.  2. Soon after the recommendation admission system was officially approved, campus disputes worsened, which caused the preferential admission treatment of athletes to be severely criticized, making it difficult to continue with the conventional system any longer. Accordingly, during the period from the late 1960s to the early 1970s, universities abolished the preferential treatment given to athletes in entrance examinations.  3. Since the recommendation admission system was officially approved in 1967, the faculties of physical education at private universities, among others, started to actively admit athletes based on recommendation. These physical education faculties selected students based on physical skill tests to secure competent athletes. Thus, by matching the admission policy of the faculty with the sporting abilities of athletes, universities were able to secure competent athletes without having to impose a special admission quota for athletes.  4. In the 1980s, private universities played a leading role in conducting entrance examinations with a special admission quota for athletes. Waseda University launched the Special Selection System for Physical Education Major, which introduced a special admission quota for athletes, specified the athletic events and performances, and made the selection process widely known to the public. In conducting this selection, however, the university faced a dilemma of whether or not to employ it as the system for strengthening their sports teams.  5. In 1987, the Ad Hoc Council on Education, an advisory body of the Japanese Government on education, recommended that assessment of sports activities be taken into consideration in entrance examinations. The 1989, the Guidelines for University Entrance Examination, revised in accordance with the Council's recommendation, listed “adequate assessment of activities in sports, culture, etc.” as a selection method for university admission for the first time.

著者

小林 ゆい 森下 はるみ

出版者

社団法人日本体育学会

雑誌

体育學研究 (ISSN:04846710)

巻号頁・発行日

vol.45, no.1, pp.77-88, 2000-01-10

被引用文献数

4

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A study was performed to clarify the relationship between basic movements and respiration patterrn in Kyogen, a Japanese traditional performing art. The subjects were three professional Kyogen actors (Oukura-ryu, Yamamoto-ke), with performing careers of 10, 19 and 53 years, respectively. The latter subject had been designated an important intangible cultural property. The subjects were asked to perform four typical Shosa (kata) at three speeds and three Komai-a chain of dance movements. We recorded the respiration curve using a rubber strain gauge placed on the actor's thorax, and observed the relationship between movements and respiration phase, cycle, and ratio of inspiration time to expiration time. The results were as follows:Shosa (kata)Subj.10-year career : Regardless of movement speed, the respiration phases were harmonized, which is a typical feature of sports performance.Subj.53-year carrer : In all shosa, the respiration phases were independent of movements. However the respiration cycle and the ratio of inspiration time to expiration time were proportional to the speed of movement. Subj.19-year career : The subject showed features intermediate between those of the subjects with 10- and 53-year careers. Komai Subjs.with 19-and 53-year careers : The respiration curve was independent of movement, and appeared similar to that during the singing of "Utai" music by Jiutai actors. It was found that the the respiration curves between basic movements and the respiration pattern in Kyogen gradually changed from harmonization to separation, according to the actor's skill. However, during performance of "Utai", the respiration pattern was harmonized with the "Utali" melody.

著者

坂口 将太 図子 浩二

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.58, no.2, pp.599-615, 2013 (Released:2013-12-07)

参考文献数

27

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This study investigated the development of rebound jumping ability in preschool children. The subjects included 100 boys (2 years: 8, 3 years: 19, 4 years: 33, 5 years: 30, and 6 years: 10) and 80 girls (2 years: 11, 3 years: 22, 4 years: 21, 5 years: 18, and 6 years: 8). The measurements used were jumping height in counter movement jumping (CMJ), index (jumping height/ground contact time) of consecutive rebound jumping (RJ), foot length, shank length, Achilles tendon length, relative Achilles tendon length (Achilles tendon length/shank length), relative foot length (foot length/shank length) and calf girth as morphological characteristics. The main results obtained were as a follows.   1)  CMJ jumping height and RJ-index increased with age. Development of RJ-index depended on the increase in jumping height because ground contact time did not change even though jumping height increased with age.   2)  CMJ and RJ ability development types were classified into 3 groups according to ±1 SD of the residual of regression line with age in months (good, equal, and poor groups). For RJ ability, the number of equal groups decreased significantly after 50 months in boy and girls. In addition, for boys, the number of individuals in the good group increased significantly after 50 months, whereas for girls, the number of individuals in the poor group increased significantly after 50 months. No such changes were found in CMJ ability.   3)  RJ jumping height and ground contact time were compared among the 3 groups. The good group showed a significantly higher jumping height and shorter ground contact time than the other 2 groups. In addition, morphological characteristics showed no significant differences among the 3 groups.   These results suggest that the development of RJ ability differs from that of CMJ ability, and that the development difference in RJ ability begins to become evident in infants over 50 months. In addition, it is suggested that this difference is influenced by factors other than morphological characteristics.

著者

佐野 史郎

出版者

社団法人日本体育学会

雑誌

体育學研究 (ISSN:04846710)

巻号頁・発行日

vol.15, no.5, 1971-07-30

著者

田邊 元

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.66, pp.791-807, 2021 (Released:2021-11-27)

参考文献数

88

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This paper aims to clarify some of the diverse martial arts practices during the Meiji era by identifying martial arts entertainment that was mainly prevalent in that period. It follows the activities of shinto-ryu kenbujutsu, which was founded by Hibino Raifu in the middle of the Meiji period and included performances in its practice. This paper analyzes the martial arts practiced in martial arts performances from the perspective of their performance character. The performance character refers to the nature of martial arts as practiced in a “see/be seen” relationship. How was the martial art practiced in such a relationship? The study examines how Hibino practiced martial arts entertainment while being aware of the audience’s gaze. Chapter 2 gives a detailed description of Hibino’s life. Hibino was different from other martial artists in that he had connections with the regime side, such as soldiers, politicians, and scholars, although his origins are unknown. Throughout the Sino-Japanese War and the Russo-Japanese War, he was supported by many people, and his performances were attended by military and political figures. He actively presented the martial arts to such audiences, including those on the regime side, in the form of entertainment. Chapter 3 clarifies specific details of the practice of shinto-ryu, which included sword dance, practiced by a swaggerer and recognized by the audience as a dance performed by female geisha. Hibino stated that kenbujyutsu and sword dance were different, and that sword fighting represented an extension of “martial arts training”, which through practice showed the “reality and activity of the yamato spirit”. To be more specific, the demonstration was so fierce that the swords broke, and the audience felt as if they were watching a duel, and even cried. Of course, the audience included soldiers and politicians as mentioned earlier. In other words, Hibino’s martial arts performances satisfied both the masses and the critical gaze of soldiers and politicians. As mentioned above, although the martial arts could be perceived as “violent” in the new era, Hibino adapted to the times by actively presenting performances that met the requirements of the audience.

著者

五賀 友継 李 燦雨

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.63, no.1, pp.121-137, 2018-06-10 (Released:2018-06-20)

参考文献数

93

被引用文献数

1

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The aim of this study was to clarify the establishment and development process of Dai Nippon Kyudo Kai (DNKK), which existed from the Meiji to the pre-war Showa era, and its organizational forms. The tasks of the study were to elucidate the establishment and developmental process of the DNKK based on the historical characteristics of the organization, which can be divided into 6 periods. The organizational forms were examined based on the articles of incorporation, and the trends of membership and branch distribution were also clarified. The results were as follows: 1)The DNKK was established as Seinen Kyujutsu Kai under the Toshizane Honda school in 1909, and shortly renamed the Dai Nippon Kyujutsu Kai. When it became an incorporated foundation in 1919, it was renamed the DNKK. The kyudo philosophy of Kako Neya was strongly reflected at the time of its foundation. 2)The DNKK increased its membership by developing its publishing arm, and promoted kyujutsu and kyudo as part of the regular curriculum in the school. 3)Division among DNKK members in 1915 and the death of Toshizane Honda in 1917 led to a schism of Toshizane Hondaʼs pupils, which resulted in diffusion of the Toshizane Honda method among kyudo players. 4)The DNKK was renamed kyudo from kyujutsu when it became an incorporated foundation in 1919. They considered kyujutsu to be a subject within kyudo. 5) The massive promotion of the DNKK was financially supported by kyudo shops. 6)Analysis of the articles of incorporation showed that the kyudo philosophy of Kako Neya was strongly reflected in the policy of the DNKK through a mechanism based on the opinions of the board of councilors. 7) The conflict with Dai Nippon Butoku Kai over kyudoyosoku resulted in further expansion of the DNKK because of the massive promotion program against them, and a medically negative interpretation to kyudoyosoku evident at the Tokyo Provisional First Army Hospital. 8)Kako Neya decided to step down in 1943, and the activity of the DNKK was substantially terminated in 1944 due to the influence of war. 9)The cumulative total DNKK membership was 22,769 between June 1912 and October 1943. The membership trend was affected by various external factors. 10)A total of 426 branches were established domestically and internationally. The trend of branch establishment was similar to that of membership, and 75% of branches were located in Eastern Japan. The DNKK aggressively promoted overseas expansion.

著者

吉田 拓矢 川原 布紗子 福田 有紗 白井 蒼 佐久間 彩 図子 あまね 淺井 武 谷川 聡 平嶋 裕輔

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.20110, (Released:2021-05-12)

被引用文献数

1

著者

遠藤 俊典 宮下 憲 尾縣 貢

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.53, no.2, pp.477-490, 2008-12-10 (Released:2009-02-25)

参考文献数

26

被引用文献数

3 8

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The purpose of the present study was to clarify the factors involved in deceleration in the last phase of a 100 m sprint by comparing the kinetics of the lower limb joints between the maximal running velocity phase (Max) and the deceleration phase (Dec). Five male collegiate sprinters, running 60 m and 100 m at maximal effort, were videotaped with high-speed cameras (250 fps) and the ground reaction force (1000 Hz) was measured at the 50-m and 85-m points. The kinematics and kinetics of the lower limb joints were then calculated. The results were as follows: 1) The deceleration of running velocity was due to a decrease of stride frequency. 2) In the Dec, braking impulse increased, but propulsion impulse decreased significantly. 3) Significant decreases were found in joint torque and negative power exerted by ankle plantar flexors. 4) Hip negative work exerted by hip joint torque in the late support phase tended to decrease, and it is thought that this decrease affected the delay of hip-flex movement during the early recovery phase. These results reveal that the function of the ankle has a direct influence on deceleration, and suggest that the negative work exerted by hip joint torque during the support phase may help to maintain hip-flex movement during the early recovery phase in the final phase of the 100-m sprint.

著者

鈴木 楓太

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.19012, (Released:2020-02-10)

被引用文献数

1

著者

勝又 宏 川合 武司

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.40, no.6, pp.381-398, 1996-03-10 (Released:2017-09-27)

被引用文献数

7

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This study was designed to examine how baseball batters adjust their batting actions to slow-speed and fast-speed pitches by measuring the ground reaction forces. The followings were revealed during different phases of the batting action. 1) At the take-back motion phase, the weight was transferred onto the catcher-side foot. The ground reaction force of the left foot, i.e., the pitcher-side foot, was increased immediately to fix the left foot firmly on the ground at the bat-swing phase. 2) In batting the slow-speed pitches, fixing the stepped left foot on the ground was remained momentarily before the bat-swing action. 3) In batting the slow-speed and fast-speed pitches, the ground reaction force curves of the left foot at the bat-swing phase were almost the saae. 4) The bat swing was started after fixing the left foot on the ground. 5) In each batting for the slow-speed and the fast-speed pitches which were mixed at random, the beginnig-phases of the batting motions were started at the almost same time. These analyses suggest the followings: 1)Ddecision on hitting the pitch is made before fixing the stepped foot firmly on the ground. 2)By momentary fixation of the stepped foot on the ground, the bat-swing action is synchronized to the pitch for correctly timed hitting. 4)When it is difficult for batters to predict whether the next pitch will be fast-speed or slow-speed, batters' actions may be prepared to hit the fast-speed pitches. And when the pitched ball is slow-speed, batters may adjust the start of the bat-swing action by momentary fixation of the stepped foot on the ground.

著者

石井 泰光 山本 正嘉 図子 浩二

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.55, no.1, pp.63-79, 2010 (Released:2010-07-20)

参考文献数

39

被引用文献数

3

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The purpose of this study was to investigate the similarities of upper torso rotation and pelvic rotation around the vertical axis of the global coordinate system with trunk rotation during throwing and striking movements. We enrolled twenty-three right-handed male college students, who performed baseball pitching and batting movements and the golf driver shot. During the throwing and striking movements, 3D coordinates of body landmarks were obtained using the VICON 612 system with 10 cameras operating at 120 frames per second. The ball speed during pitching and the head speed during batting and the driver shot were measured using a high-speed camera at 250 frames per second and analyzed using WINanalyze (2D motion analyzer). The angles of rotation of the upper torso and pelvis were calculated as the angles between the respective segment and the global x-axis. The trunk rotation angle was calculated as the angle between the upper torso segment and the pelvic segment. The sequential data for rotational movement variables were normalized from the onset of the minimum upper torso angle until release or impact. There were significant positive correlations between the ball speed during pitching, head speed during batting, and head speed during the driver shot (pitching vs. batting, r=0.627, p<0.01; pitching vs. driver shot, r=0.670, p<0.01; batting vs. driver shot, r=0.554, p<0.01). There were significant positive correlations between the two striking movements with regard to the maximum angular velocity of upper torso rotation (r=0.567, p<0.01) and pelvic rotation (r=0.523, p<0.05). The batting and driver shot showed similarity of trunk rotation and pelvic rotation in that the contribution of pelvic angular velocity to the maximum upper torso angular velocity was larger than the contribution of trunk rotational angular velocity to the maximum upper torso angular velocity. Upon trunk rotation, there were no significant positive correlations among the pitching, the batting, and the driver shot with regard to maximum angular velocity. These results indicate that the ball and head speeds are strongly related during pitching, batting, and the driver shot. The upper torso rotation and pelvic rotation around the vertical axis of the global coordinate system are related only during batting and the driver shot.

著者

津越 智雄 浅井 武

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.55, no.2, pp.565-576, 2010 (Released:2010-12-28)

参考文献数

24

被引用文献数

5

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This study examined the physique, physical fitness and motor ability of soccer players, especially junior youth and youth players of “J-League” clubs, using relatively common field test items in accordance with the Japan Football Association (JFA) Physical Measurement Guidelines (2006). We also compared the physique, physical fitness and motor ability between those who were promoted and those who retired from clubs for each generational category (top team group and second team group for the professional category) in an attempt to identify factors that significantly influence selection to higher categories. The study subjects were 213 male soccer players who were affiliated to a team (aged 19 years or older) in the Japan Professional Soccer League (J-League) or its subsidiary clubs, including the youth team (16-18 years) and the junior youth team (13-15 years), between 2006 and 2008. All subjects were compared for the following items: body height, body weight, percentage body fat, 10-m run, 30-m run, 50-m run, shuttle run (10 m×5), STEP 50, vertical jump, standing five-step jump, and multi-stage shuttle run. The measurements were also compared between those who were promoted and those who retired from the club for each category using the t-test and discrimination analysis. The results revealed that the factors of physique, physical fitness and motor ability that significantly influenced the promotion or retirement of junior youth and youth players were those related to physique (especially body weight), speed and agility. Power-related factors were more important in youth players, but were less influential than the above-mentioned factors. The influence of endurance-related factors appeared to be even smaller. The field test items used in the present study are considered valuable for use in training practice in that they can be performed relatively easily and allow selective factors for each category to be determined to some extent.