著者

志村 芽衣 宮澤 隆 矢内 利政

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.487-500, 2019-12-16 (Released:2019-12-20)

参考文献数

16

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The purpose of this study was two-fold; to determine the optimum impact condition for maximizing flight distance toward the opposite field and to examine the influence of the bat angles at impact on the batted ball characteristics (speed, rotation, and angle immediately after impact) and the flight characteristics (distance, trajectory, and time). Various impact conditions were defined using 3 factors: the angles of the bat at impact projected to the horizontal and vertical planes, and the vertical inclination angle of the line of impact (the product of the sine of this angle and the radius of the ball determines the under-cut distance). Three-dimensional finite element analysis was used to construct a model of impact between a baseball and a wooden baseball bat and to conduct simulation analysis. The initial flight condition of the batted ball after the impact was determined for each simulated condition, and the flight distance was estimated from the initial flight condition. The results showed that a nearmaximum flight distance of 90-95 m was attained over a wide range of the opposite field when the bat head was not lowered substantially more than the grip-end. However, when the bat head was lowered substantially more than the grip-end, the flight distance attainable with the given impact condition decreased as the vertical bat angle increased, and the range of horizontal bat angle within which a great flight distance was attainable became narrower. The latter results suggest that a batsman needs to acquire a sophisticated technique with a greater precision of ball impact to hit a ball toward a given horizontal angle in the opposite field if the bat swing is characterized as lowering of the bat head to a large extent.

著者

戎 利光

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.30, no.1, pp.37-43, 1985-06-01 (Released:2017-09-27)

被引用文献数

1 2

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本研究の目的は,運動持続距離を二等分あるいは三等分と分散して走運動を行った場合に,心肺持久性及び血液脂質に及ぼす身体的効果が,分散しないで一度に全距離を走った場合の効果と異なるか否かを明らかにすることである。53名の健康な男子学生をA群からD群の4群に分類した。A群は全距離を一度に走り,B群は半分の距離を1日2度(朝,夕)に分散して走り,C群は3分1の距離を1日3度(朝,昼,夕)に分散して走った。D群は対照群であり,本研究期間中特別な身体運動をしなかった。D群を除く全被験者は,週に3日間,各個人の最高心拍数の80%を維持して10週間に渡り,屋内のタータントラックを走った。そして, このトレーニング期間前後の最大酸素摂取量,最高心拍数,脂肪百分率(水中体重測定による),1.5マイル走の記録,総トリグリセライド,総コレステロール,高比重リボ蛋白コレステロール,低比重リボ蛋白コレステロール,超低比重リボ蛋白コレステロールを,各群ごどに比較,検討した。その結果,次のような結論を得た。分散した最短走距離が心肺持久性や血液脂質に影響を及ぼすような距離であれば,同一の運動強度及び頻度で同一距離を走る限り,その走距離を二等分あるいは三等分と分散しても総消費エネルギーは同一であり,心肺持久性や血液脂質に及ぼす影響に差はない。本研究は,米国ブリガムヤング大学及び米国デザレットジム財団からの研究交付金を受けた。

著者

吉浦 公生

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.6, no.1, pp.243, 1961-09-01 (Released:2016-12-31)

著者

鈴木 秀人

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

2021

著者

松倉 啓太 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

vol.65, pp.1049-1067, 2020 (Released:2020-12-24)

参考文献数

21

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The aim of this study was to shed light on preparatory sequences performed by elite goalkeepers for defense against shots in response to variations in the position from where a shot at goal is taken, and in the number of touches ahead of the shot. The samples were extracted from videos of shots in all 64 matches of the 2018 FIFA World Cup in Russia. First, to analyze the characteristics of shots in elite games, data on shots from different areas and after various numbers of touches were studied. Then, to analyze the preparatory sequences taken by goalkeepers to defend against those shots, the shots were classified into 6 groups based on ‘the presence or absence of a specific prejump’, ‘a change in the distance between the feet during the preparation period’, and ‘whether the goalkeeper was still in a moving position or had completed the move’. The results of this analysis of the characteristics of the elite game made it possible to divide the positions from where shots were taken in 2 types, based on the probability of the shot being on target and the probability that a goal would be scored. In addition, it was shown that when one-touch shots were on target, it was difficult for goalkeepers to defend against them. Next, as an overall trend, the most frequent preparatory sequence performed by goalkeepers was to prepare for a shot with a slight jump in order to widen the distance between the feet after they had finished moving into position. In addition, a breakdown of the preparatory sequences for various numbers of touches ahead of the shot revealed that – for onetouch shots – a proportion of goalkeepers moved into position until immediately before the shot was taken. Overall, from these analyses, it was concluded that elite goalkeepers must engage in different preparatory sequences depending on the circumstances of the shot.

著者

小野 雄大 友添 秀則

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.14043, (Released:2014-09-29)

参考文献数

61

被引用文献数

6 3

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The Young Men's Association (YMA) was an education institute that provided business programmes and further education for young men. It aimed to train both mind and body, and valued sporting activities.   However, there has been little knowledge about the state of sporting activities provided by the YMA. Therefore, the present study aimed to evaluate the state of the sporting activities at Fuchu YMA in Tokyo. For this purpose, the study used Fuchu-sport bulletins which specialized in such sporting programmes during the Taisho era and pre-war Showa era.   The main findings are summarized as follows.   1)  Fuchu-sport was modeled on a specialized magazine, Asahi Sports. The publication of Fuchu-sport was an indication of the high interest in sport during the Taisho era.   2)  After the Ministry of Home Affairs and the Ministry of Education announced their first and second instructions, the Tokyo government independently ran conferences aimed at the development of sport and physical education at Tokyo YMA. Accordingly, Tokyo was one step ahead of other areas in Japan in setting up athletic clubs for the YMA.   3)  The organization of kyogi-bu was supported mainly by Fuchu YMA, but also funded by the local authority and by Fuchu ordinary and higher elementary school, the latter being also committed to conducting actual sporting activities.   4)  University students were recruited as coaches, and thereby the kyogi-bu provided successful programmes that led to an improvement in competitive level. However, this improvement resulted in elimination of some of the members.   5)  The remarkable successes of the kyogi-bu and its development in Fuchu were accomplished by collaborating with the local educational institutions. The relationship between the YMA and school athletic clubs was another significant factor in running the sporting programmes.   The present study has provided deeper insights into the nature of sporting activities held by the YMA during the Taisho era and pre-war Showa era.

著者

西 泰信 岩井 圭司

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.11110, (Released:2012-07-11)

参考文献数

30

被引用文献数

1

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The purpose of this study was to identify psychological factors that contribute to the development of sub-clinical primary exercise dependence among Japanese exercisers. Most studies of exercise dependence follow a top-down, quantitative, hypothesis-verification approach. The present study, in contrast, used a qualitative method, the Grounded Theory Approach. Dialogue data were collected from 14 exercisers who were evaluated for sub-clinical primary exercise dependence in semi-structured interviews and analyzed by classifying them into categories. Through these steps, seven types as psychological factors were identified as leading to sub-clinical primary exercise dependence among Japanese exercisers: dependence, obsessive-compulsiveness, conflict avoidance, maintenance of a positive self-concept, perceieved benefit of exercise, limited stress-coping resource, and typical increase in exercise volume. It was also found that dependence and obsessive-compulsiveness play a crucial and direct role in the development of sub-clinical primary exercise dependence, and that conflict avoidance and maintenance of a positive self-concept can precipitate obsessive-compulsiveness. Finally, a perceived benefit of exercise was shown to be an integral component of dependence.

著者

満下 健太 村越 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

pp.19048, (Released:2020-01-10)

被引用文献数

1

著者

谷中 拓哉 近田 彰治 矢内 利政

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.16056, (Released:2017-01-24)

参考文献数

12

被引用文献数

1

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A wide range of topspin rotation of a bat around the long-axis, referred to as “rolling”, has been observed in baseball batting, but the mechanical reasons for the large variability among individual batters has not been examined. The purpose of this study was to investigate the factors determining this variability in rolling velocity among professional baseball players. Twenty-nine professional batters each performed eight “free-batting” trials. An electromagnetic tracking device was used to measure the three-dimensional rotational motion of the bat in each trial. The rolling velocity was 678±376°/s, comprised a negative contribution attributable to the batter's effort of exerting torque (Mechanism 1; −1144±488°/s) and a positive contribution attributable to the gyroscopic effect (Mechanism 2; 1808±339°/s). A significant positive correlation (r=0.67, p<0.05) was found between the rolling velocity and the negative contribution of Mechanism 1. These results indicate that (a) the torque exerted by the batter resists the rolling and that (b) a higher rolling velocity is attained by batters who exert a smaller resistive torque on the bat than those who exert a larger torque. On the other hand, no correlation (r=0.09) was found between the rolling velocity and positive contribution of mechanism 2. These findings suggest that the batter makes an active effort to resist rolling, and that the amount of resistive torque exerted by the batter is the primary reason for the inter-individual difference in rolling velocity attained at the instant of ball impact. As the resistive torque is likely to be exerted by the nobside hand in the form of pronation torque (Ae et al. 2015) and the pronation causes lowering of the bat-head (increasing nutation angle), a reduction of the pronation torque should decrease the resistive torque acting on the bat, helping to attain a high rolling velocity. In fact, we observed a greater deceleration of nutation velocity in the fast-rolling group than in the slowrolling group (p<0.05). To attain the high rolling velocity, therefore, we suggest that batters should aim to build up the nutation velocity of the bat until about 50 ms before ball impact, and then vigorously decelerate it immediately before ball impact.

著者

大峰 光博

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.61, no.2, pp.629-637, 2016

被引用文献数

1

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The purpose of this study was to analyze problems related to the mechanism whereby students can accept corporal punishment during extracurricular sports activities with reference to the books <i>Escape from Freedom</i> and <i>Man for Himself</i> that were central to Erich Fromm's authority theory. Specifically, the author focused on the concepts of &ldquo;authoritarian character,&rdquo; &ldquo;authoritarian ethics,&rdquo; and &ldquo;authoritarian conscience.&rdquo; Fromm pointed out that anxiety prompted Germany's citizens to give up their freedom in order to obey authoritarian powers such as Hitler and the Nazis.<br>  Students taking part in extracurricular sports activities were considered from the viewpoint of Fromm's authority theory. It was revealed that students comply with a leader's authority in order to relieve anxiety, and have positive thoughts about corporal punishment. Furthermore, it was found that such acceptance of corporal punishment succeeded in eliminating conspicuous suffering, but not in removing any underlying conflicts.<br>  Fromm pointed that fear of anxiety was relieved by spontaneous activity. To achieve spontaneous activity by students, it was suggested that some form of measure that does not create the type of partnership that occurred between Germany's citizens and Hitler would be desirable for any relationship between the leader of extracurricular sports activities and the students.<br>

著者

中川 宏 熊本 水頼

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.18, no.2, pp.83-89, 1973-10-25 (Released:2017-09-27)

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ウェイトリフティングの選手について, ベンチプレスを行なわせたときの筋の作用機序について筋電図学的に検討した. 1) 手関節の姿勢制御を示すような筋の働きは認められなかった. 2) 肘関節はただ単純に伸展を行なっているだけで, 姿勢制御を示す筋の働きは殆んど認められなかった. 3) 筋力に余裕のあるとき, 肘関節伸展は上腕三頭筋外側頭のみで行なわれ, 筋力の劣るときは同筋長頭も参画した. 長頭の収縮がもたらす肩関節伸展の力は, 肩関節屈曲筋群の活動の増強で消却された. 4) 肩関節は水平位内転と屈曲の合成された動きを示す筋放電様相を呈した. 5) 挙上能力の劣るものには, 無駄な, かつまた抑制的と考えられる筋放電も認められた.

著者

堀井 千代鶴 長田 一臣

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.4, no.1, 1959

著者

桜井 伸二 池上 康男 矢部 京之助 岡本 敦 豊島 進太郎

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.35, no.2, pp.143-156, 1990-09-01 (Released:2017-09-27)

被引用文献数

10 6

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Many joint actions are involved in the throwing motion of a fastball pitch; therefore, two dimensional (2-D) procedures are insufficient for analyzing the throwing motion. In this study,three dimensional (3-D) high-speed cinematography was used to record fastball pitches of varsity baseball pitchers. Two small reference sticks were fixed on the hands and forearms of the throwing arm of the subjects to detect their movements.The direct linear transformation (DLT) method was used for 3-D space reconstruction from 2-D images filmed by two from 2-D images filmed by two phase-locked cameras (200 frames/s).The throwing arm has seven degrees of freedom of joint motion except in the fingers; three for the shoulder, one for the elbow, one for the radioulnar, and two for the wrist. Following seven joint angle changes corresponding to all these degrees of freedom were obtained throughout the pitching motion. 1) horizontal abduction/horizontal adduction angle at the shoulder joint, 2) abduction/adduction angle at the shoulder joint, 3) internal rotation/external rotation angle at the shoulder joint, 4) flexion/extension angle at the elbow joint, 5) pronation/supination angle at the radio-ulnar joint (forearm), 6) radial flexion/ulnar flexion angle at the wrist joint, 7) palmar flexion/dorsi flexion angle at the wrist joint. The results showed that horizontal adduction and internal rotation of the shoulder,extension of the elbow, pronation of the forearm, and palmar flexion of the wrist were the important joint actions for fastball pitching in baseball. Preliminary to these motions were motions in the opposite direction; e.g., horizontal abduction and external rotation of the shoulder,flexion of the elbow, supination of the forearm, and dorsi flexion of the wrist were detected.These motions in the opposite direction would be useful to extend the range of the motion in each joint angle. The results also appear to be connected to intrinsic muscle propertios, that greater power can be exerted during shortening of the muscle when it is stretched just before the shortening action.

著者

宮西 智久 藤井 範久 阿江 通良 功力 靖雄 岡田 守彦

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.41, no.1, pp.23-37, 1996-05-10 (Released:2017-09-27)

被引用文献数

7

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We investigated the contribution of the motions in the upper torso and the throwing arm joints to the ball velocity during the baseball throw. The ball velocities caused by the anatomical rotations at the upper torso, shoulder, elbow, wrist and metacarpophalangeal joints were calculated as the vector products between the anatomical angular velocity vectors of joints and the respective relative displacement vectors from the joint centers to the center of ball, by using a mathematical model reported by Sprigings et al. (1994). Horizontal throws of twenty-four male university baseball players were filmed using a three-dimensional DLT method. In order to verify the ball velocities obtained from the anatomical joint rotations from the instant of the stride foot contact to the ball release, the velocity of ball measured directly from video recording was compared with that calculated by the mathematical model. A good agreement was acquired between the velocity of ball measured and that calculated. The velocities obtained from the left-rotation, flexion at the upper torso joint and the horizontal flexion at the shoulder joint contributed to the ball velocity in the early phase where the increase of ball velocity was slow. The velocities obtained from the internal-rotation at the shoulder joint, extension at the elbow joint, palmar-flexion at the wrist joint, and left-rotation/flexion at the upper torso joint contributed in the late phase where the increase of ball velocity was rapid. At the ball release, the contribution of each joint, which is the ratio of the positive ball velocity obtained from the anatomical joint rotations to the summation of individual positive ball velocities was as follows; 34.1% by the internal-rotation at the shoulder, 17.7% by the palmar-flexion at the wrist, 15.2% by the extension at the elbow, and 9.6% by the left-rotation at the upper torso joint.

著者

鈴木 健介 浅井 武 平嶋 裕輔 中山 雅雄

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.20061, (Released:2021-03-04)

著者

岡野 憲一 山中 浩敬 九鬼 靖太 谷川 聡

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.16068, (Released:2017-03-13)

参考文献数

29

被引用文献数

3

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This study examined for the first time the correlation between the spike jump (SPJ), an action specific to volleyball, and other jumps among 202 top-level male volleyball players from domestic leagues (84 from the V. League and 118 from the first division of the Kanto University Volleyball Association). We then categorized the ability of the players during stretch-shortening cycle exercise (SSC) to examine the characteristics of SPJ performance and other positions. The results indicated that, on the one hand, ability in both the counter movement jump (CMJ) and rebound jump (RJ) is required for the SPJ, RJ showing more prominence among elite players. On the other hand, for SSC ability, exercise requiring a longer duration, such as the CMJ, was found to be more critical for the SPJ with a one-step run-up. In terms of different player positions, the results suggested that a middle blocker (MB) with a shorter run-up required a jump that exerts force through longer-duration SSC exercise, whereas a wing spiker (WS) with a full run-up demonstrated more ballistic SSC exercise in his jump. On the basis of these findings, this study has shown the importance of evaluating the characteristics of jump performance according to each player position when designing or choosing the most appropriate physical training exercises for volleyball players.

著者

梅垣 明美 大友 智 上田 憲嗣 深田 直宏 吉井 健人 宮尾 夏姫

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.367-381, 2018-06-10 (Released:2018-06-20)

参考文献数

43

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In school education, it is important to encourage students to improve their social skills. Umegaki et al. (2016b) have developed an instructional model known as the Acquisition of Social Knowledge in Sport (ASKS) Model for facilitating improvement in social skills in the context of physical education. They consider that the ASKS Model with heterogeneous team organization would improve social skills that would be applicable to daily life outside of physical education classes and help students to maintain these social skills. However, no previous study has examined whether the ASKS Model would be effective for homogeneously organized teams. Therefore, the present study was designed to examine the type of team organization that would be most effective for the ASKS Model by comparing physical education classes with the ASKS Model based on homogeneous teams and heterogeneous teams. The study focused on physical education classes for male students in the second year of junior high school. The classes included those without the ASKS Model, those with the ASKS Model based on homogeneous teams, and those with the ASKS Model based on heterogeneous teams. A formative evaluation of friendship-building and the KiSS-18 questionnaire on paper were administered before and after each class. The study confirmed 2 points: First, the ASKS Model appeared to be effective when heterogeneous teams were organized. Second, the effectiveness was suggested to be improved when heterogeneity of motor skills was maintained, rather than heterogeneity of social skills.

著者

池本 淳一

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.2, pp.529-547, 2014

被引用文献数

1

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&nbsp;&nbsp;This paper focuses on the position of &ldquo;Ju-ken&rdquo; matches and their promoter, Kenji Kano, in Japanese boxing history. A &ldquo;Ju-ken&rdquo; match was a match between a judoist and a boxer, and such bouts were held from the middle of the Taisho era to the early Showa era in Kobe, Tokyo and Osaka. The main organizer of these matches was the &ldquo;International Ju-ken club&rdquo;, whose owner Kenji Kano was the nephew of Jigoro Kano. This study divides the history of Ju-ken into three periods, each with respective features.<br> &nbsp;&nbsp;The first period was from October 1919 to April 1921. Ju-ken at this time was intended to reform judo into a competitive sport through fighting with boxing. Although judo had been well established at that time, it was facing a challenge due to loss of its spirit and form as a martial art during the process of sportification. Jigoro Kano, the founder of Judo, was unhappy with this change. By studying boxing, karate, aikido, stick fighting and other martial arts, he aimed at creating a &lsquo;Martial Art Judo&rsquo;. His nephew Kenji Kano pursued martial art-oriented judo as well, but his approach to reconstructing judo as a martial art was through mixed martial arts games, the &ldquo;Ju-ken match&rdquo;.<br> &nbsp;&nbsp;The middle period was from May 1921 to March 1925, when Ju-ken evolved into a spectator sport that encapsulated the struggle for superiority in terms of nationality and ethnicity. Because Kodokan prohibited their members from participating in any mixed-martial arts match from April 1921, Ju-ken became a spectator sport. In addition, after charity matches following the Great Kanto Earthquake, in order to bring more excitement to the game, Ju-ken heightened the opposition and rivalry based on the nationalities and ethnicities of the athletes.<br> &nbsp;&nbsp;The final period was from April 1925 to August 1931, when Ju-ken changed into a show that was intended to provoke nationalistic emotions among the audience. After the development of &ldquo;normal&rdquo; boxing, Ju-ken held normal boxing matches in their games and adopted new boxing-like rules. These new rules and the point systems put foreign boxers at a disadvantage when fighting against Japanese judoists, ensuring that Japanese would always defeat foreigners.<br> &nbsp;&nbsp;Finally, through assimilation of knowledge and focusing on boxing, this study argues that Ju-ken matches created a background for localization of modern boxing in Japan.<br>

著者

森田 啓 荒牧 亜衣 植木 陽治 深澤 浩洋

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.64, no.1, pp.303-313, 2019

被引用文献数

2

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The purpose of this research is to consider ways to encourage critical thinking in Philosophy of Physical Education and Sports classes. Introductory classes for students specializing in sports education were observed. Students reviewed a specific example in which a batter was given an intentional walk five consecutive times and they aimed to consider the case critically.<br> Right after watching the case on screen, students noted whether they agreed with such a practice or not. Then, 3 points were explained and students noted their opinion again.<br> The 3 points were;<br> (1) position of activities of sports clubs<br> (2) regarding it as a competitive sport<br> (3) regarding it as part of education (Physical Education)<br> In 4 years, 8 classes were held and 1,020 students participated in them. 118 of them (11.5%) changed their opinion after listening to the explanation. It must prove that those students were able to analyse even their own initial judgement critically and perceive it differently.<br> Furthermore, the following became clear from comments written after the classes:<br> By watching and using a specific example on screen, there is a possibility to eliminate/reduce negative images some people hold towards sports(P.E.) philosophy or philosophy. It also increases the possibility to engage students positively by introducing active learning of actually thinking and writing down their opinions.

著者

堀山 健治 田中 豊穂 中川 武夫 林 邦夫 伊保 清次

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.33, no.3, pp.175-183, 1988-12-01 (Released:2017-09-27)

被引用文献数

3

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This study was planned to to compare the hearing level of Kendo-Players with that of non-Kendo-Players to make clear whether or not long term practice of Kendo causes hearing loss. Pure-tone audiometry by air conduction was applied to 172 Kendo-Players and 76 non-Kendo-Players with an audiometer (Audiometer AA-69, Audiogram Recorder RE-05, Soundproof Room AT-45, Rion, Japan). Among them, the following cases were excluded from the analysis. 1) Cases who have had medication against tuberculosis. 2) Cases with perforation in the tympanic membranes. 3) Cases with occupational experience of more than a year in noise nuisance. 4) Cases with experience of head phone listening for more than one hour a day, twice a week for at least one year. The thresholds of hearing between 149 Kendo-Players (cases, age: 19-76) and 44 non Kendo-Players (controls' age: 20_78) were analysed to compare mean hearing thresholds between the age groups, and to examine covariance adjusted with age. The dose-response relationship was examined by the partial correlation coefficients controlled by age between the thresholds of hearing and the length of Kendo experience (year) or the total experience hours of Kendo (hour). The rusults showed that the hearing loss of Kendo-players was greater than non-Kendo players, especially at the frequency of 4000 and 8000 Hz in the age group of 30-59 years old. It is supposed that long term practice of Kendo may cause hearing loss. Further study, however, will be needed to re-examine the dose-response relactionship with more carefully selected samples for the epidemiological survey in the future.