著者

淵本 隆文

出版者

一般社団法人 日本体育学会

雑誌

日本体育学会大会号

巻号頁・発行日

vol.46, 1995

著者

淵本 隆文

出版者

一般社団法人 日本体育学会

雑誌

日本体育学会大会号 第46回(1995) (ISSN:24330183)

巻号頁・発行日

pp.397, 1995-09-10 (Released:2017-08-25)

著者

藤原 敏行 淵本 隆文

出版者

社団法人日本体育学会

雑誌

日本体育学会大会予稿集

巻号頁・発行日

no.56, 2005-11-01

著者

永田 聡典 淵本 隆文

出版者

日本バレーボール学会

雑誌

バレーボール研究 (ISSN:13449524)

巻号頁・発行日

vol.13, no.1, pp.1-7, 2011 (Released:2021-08-11)

被引用文献数

1

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This study was designed to develop a device (DSH) to measure the maximum spike height (Hs-max) in volleyball and examine its measurement methods. DSH measures the height of a ball, which is suspended and can be moved between 200 and 380 cm from the ground,when it is hit by a player. We selected thirty male university volleyball spikers, and measured the height of the tip of the middle finger with their arm stretched overhead( Hf) and the maximum vertical jump height( Hmax). Then, we asked them to spike a tossed ball, and measured the height( Hs) and speed of the ball when it was hit, using the 3D direct liner transformation( DLT) method. After having spiked a ball at many different levels, players evaluated the height( SAh) and speed( SAv) of the ball in each spike on a ten-score scale. We defined the height of the ball when [SAh + SAv] is maximum as “Hs-max” There were correlations between the ball height and SAh, and the ball speed measured by DSH and SAv. Since there was also a correlation between [SAh + SAv] and SAh or SAv, Hs-max proved to be valid. We selected twenty female university students, and measured Hs-max twice in two days using DSH. The reliability coefficient for the measurements was as high as 0.913. We divided the players into two groups: Group HS (n=15), players who spiked the ball at a height of 285.5 cm or more; and Group LS( n=15), players who spiked at 285 cm or less. Hs-max was significantly larger( p<0.05) and “Hs-max - Hs” was significantly smaller( p<0.01) in Group HS, compared to Group LS. The players in Group HS not only spiked the ball at higher points,but they were also good at controlling the timing of jump in order to spike at their maximum jump than those in Group LS. We concluded that the newly developed device, DSH, can measure the Hs-max values with excellent reliability and that the the Hs-max would provide valuable information for both players and coaches.

著者

伊藤 章 斉藤 昌久 淵本 隆文

出版者

Japan Society of Physical Education, Health and Sport Sciences

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.42, no.2, pp.71-83, 1997-07-10 (Released:2017-09-27)

被引用文献数

1 5

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A study was performed to compare joint torque development with EMG activities, and to investigate the relationship between peak torque and power during different phases of leg movement at different sprint velocities from the starting dash to full stride. Cinematographic recordings of sprint movement together with ground reaction forces and EMGs from seven lower limb muscles were obtained from four male sprinters at the 1st, 3rd, 5th, 9th, 13th and 19th (maximal velocity) steps from the sprint start. Joint torque and power in the hip, knee and ankle were computed from analysis of the film and ground reaction forces. The results can be summarized as follows: 1) The developmental patterns of joint torque and power, and the EMG activities were similar from the first step to the maximal velocity. 2) The phases of torque development were parallel to the related EMG activities. 3) Stretch-shortening cycles of muscle were observed in the m. Soleus during the foot contact period and in the m. Biceps femoris during the latter half of the swing period. 4) There was no peak torque or power that showed a decrease with increased sprint velocity. 5) Peak torque and power that increased with sprint velocity were (a) torque and positive power of the hip flexors during the first half of the swing period, (b) torque of the hip extensors during the latter half of the swing period, (c) torque and negative power of the knee extensors during the first half and latter half of the swing period, (d) torque of the ankle extensors during the middle of the foot contact period, (e) negative power of the ankle extensors during the first half of the foot contact period, and (f) positive power during the latter half of the foot contact period. These results suggest that muscles in the hip and knee joints cooperate with the change in swing movement, and that muscles in the ankle joint cooperate with the change in drive movement as sprint velocity increases. 6) The peak torque and power that remained high independent of sprint velocity were (a) torque and positive power of the hip extensors from the middle of the swing period to the middle of the foot contact period, (b) torque of the ankle extensors during the foot contact period, and (c) power of the ankle extensors during the latter half of the foot contact period. These results indicate the importance of the hip extensors and ankle extensors in sprinting.

著者

藤澤 朋子 淵本 隆文 金子 公宥

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.42, no.6, pp.436-445, 1998-03-10 (Released:2017-09-27)

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A study was conducted to examine how kinetic factors influence ball speed following a tennis forehand drive. The subjects were 15 male college tennis players, gripping the racket with their right hand. The players performed the forehand drive with maximum effort while aiming at a target area. The trials were filmed at 100 fps using two 16-mm movie cameras. Using Winter's method, the joint torque was determined two dimensionally on the horizontal plane for the wrist, elbow and shoulder joints, and for upper torso rotation during the stroke. The subjects were divided into two groups; a fast group (n=8) and a slow group (n=7) based on the ball speed. Despite a significant difference in ball speed between the two groups, no significant differences were observed in any items related to physique, muscle strength or pewer. The positive joint torque of the shoulder joint appeared from the first stage of the stroke, that of the elbow joint from the middle stagge, while that of the wrist joint appeared at the end of the stroke. The integrated positive joint torques (IT+) during forward swing were found to be the greatest in shoulder joint and the least in the wrist joint. The IT+ were significantly different between the fast and slow groups in all joint movements except for upper torso rotation. Individual ball speeds delivered by all subjects were positively correlated with the IT+ of the shoulder and elbow joints. From these results, it was concluded that (1) individual ball speeds are influenced considerably by the shoulder and elbow joint torques in the horizontal plane, and (2) players showing faster ball speed develop greater torques in all upper limb joint movements.