著者

藤井 宏明

出版者

日本性科学会

雑誌

日本性科学会雑誌 = Japan Journal of Sexology (ISSN:13496654)

巻号頁・発行日

vol.23, no.1, pp.30-36, 2005-07-31

参考文献数

8

著者

廣木 義久 藤井 宏明 平田 豊誠

出版者

日本地学教育学会

雑誌

地学教育 (ISSN:00093831)

巻号頁・発行日

vol.68, no.3, pp.119-128, 2016-03-31 (Released:2017-05-31)

参考文献数

18

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岩石の風化作用による土砂の形成の理解における土に関する学習の効果を,中学生を対象に検証した.土には花崗岩の風化物である粘土質のマサを用いた.授業では,生徒は次の二つのことを学んだ.土はさまざまな粒径の粒子,すなわち,礫・砂・泥(粘土を含む)の混合物であること,土は岩石の風化作用により形成されること,である.単元終了直後には,89.3%の生徒が砂の形成を風化モデルで説明し,その割合は,単元終了から3カ月後でも70.7%と高い値を維持していた.

著者

藤井 宏明 藤井 範久

出版者

日本バイオメカニクス学会

雑誌

バイオメカニクス研究 (ISSN:13431706)

巻号頁・発行日

vol.25, pp.14-27, 2021 (Released:2021-10-09)

参考文献数

19

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The purpose of this study was to investigate the body movements to generate handle velocity in the tangential and the radial direction of hammer head during the hammer throw turn. The positive leading distance of handle has the effect of accelerating the hammer head in hammer throw. In addition, the increase and decrease of the leading distance of handle are consistent with the increase and decrease of handle velocity in the radial direction of hammer head. It will be important to clarify the movement of the body for the acquisition of the leading distance of handle by examining the acquisition of the handle velocity in the radial direction by the body movement. Throwing motions of 44 male throwers (throwing record: 80. 50–44. 17 m) participated in the study as subjects. Throwing motions were videotaped on high-speed VTR cameras, and three-dimensional coordinates were calculated using a DLT method. The handle velocity was calculated as the vector products between the anatomical angular velocity vectors of joint and the respective relative displacement vectors from the joint center to handle, by applying a mathematical model. The handle velocity obtained by body movements were projected onto the rotating plane coordinate system. The basic findings were summarized as follows: (1) The handle velocity in the radial direction can be obtained by trunk long-axis rotation, the trunk left lean, the extension of the shoulder joint, the trunk back lean, and translational movement of the body. (2) The handle velocity in the tangential direction can be obtained by the trunk long-axis rotation, trunk twist, horizontal abduction of left shoulder joint and the flexion of shoulder joint.

著者

苅山 靖 豊田 彩乃 藤井 宏明

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.21056, (Released:2021-11-27)

著者

松尾 信之介 藤井 宏明 苅山 靖 大山 卞 圭悟

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.56, no.2, pp.287-295, 2011 (Released:2011-12-28)

参考文献数

18

被引用文献数

4

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Changes in the activity of hip adductor muscles with increased running speed were investigated in 4 male sprinters (personal best for 100 m: 10.58±0.26 s). The subjects were instructed to run at three different speeds (3-4 m/s, 6-8 m/s and 9- m/s). The surface electromyograms (EMGs) of 10 muscles around the hip joint were recorded, and whole-body motions were also filmed with a high-speed video camera (150 fps). Regardless of running velocity, the adductor longus (AL) showed activity concomitant with the rectus femoris when the hip joint was in extension. This suggested that the AL functioned as a hip flexor. On the other hand, the adductor magnus (AM) showed activity when the hip joint was flexed, suggesting that the AM assisted hip extensors such as the gluteus maximus. During high-speed sprinting, the AL was also activated when the hip joint was flexed. Similarly, the AM also showed activity when the hip joint was extended, corresponding to the latter half of the support phase. During the support phase, the AM may serve to stabilize the frontal plane by co-contracting with hip abductors such as the gluteus medius and tensor fasciae latae. Furthermore, the AL and AM showed increased activity while the hip was fully flexed and extended. This remarkable muscle activity around the flexion-extension reversal point during high-speed sprinting may stabilize the hip joint so that it resists dislocative force through the unique anatomical features of the hip adductor muscles, i.e. “shunt-” rather than “spurt-type” architectural characteristics.

著者

藤井 宏明

出版者

環太平洋大学

雑誌

環太平洋大学研究紀要 = Bulletin of International Pacific University (ISSN:1882479X)

巻号頁・発行日

vol.10, pp.181-185, 2016-03-30

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The purpose of study was investigated for male throwing athlete, the relationship between performance and control test for thrower and also examined the physical properties required between events, it is intended to obtain suggestions for guidance. As a result, items that significant correlation with the IAAF score was observed is as follows. 30m dash, Standing jump,Standing five jump, Run-up five step jump, RJ-index, Vertical Jump, shot front-back throw, clean, snatch. From these, running skill as a feature of excellent throwing athlete, jumping ability, investment capability, is that it has all of the physical fitness factors revealed. In addition, it is divided into the Javelin throw athlete and Circle-based athlete (shot put, discus throw, hammer throw), it was also examined the relationship between the IAAF score and control test items. Javelin throw on the playing characteristics of using the run-up, high correlation jump forces such as 30 dash and five step jump and continuous rebound jump was observed. On the other hand, in the circle-based events, shot front-back throw, clean, and snatch, a high correlation was observed in the event to exhibit at once power it with the recoil. Thus, each throwing event, it has been found that there is a need for physical elements, depending on the respective event characteristics.

著者

松尾 信之介 藤井 宏明 苅山 靖 大山 卞 圭悟

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.1106020186, (Released:2011-06-07)

参考文献数

21

被引用文献数

4

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Changes in the activity of hip adductor muscles with increased running speed were investigated in 4 male sprinters (personal best for 100 m: 10.58±0.26 s). The subjects were instructed to run at three different speeds (3 4 m/s, 6 8 m/s and 9 m/s). The surface electromyograms (EMGs) of 10 muscles around the hip joint were recorded, and whole-body motions were also filmed with a high-speed video camera (150 fps). Regardless of running velocity, the adductor longus (AL) showed activity concomitant with the rectus femoris when the hip joint was in extension. This suggested that the AL functioned as a hip flexor. On the other hand, the adductor magnus (AM) showed activity when the hip joint was flexed, suggesting that the AM assisted hip extensors such as the gluteus maximus. During high-speed sprinting, the AL was also activated when the hip joint was flexed. Similarly, the AM also showed activity when the hip joint was extended, corresponding to the latter half of the support phase. During the support phase, the AM may serve to stabilize the frontal plane by co-contracting with hip abductors such as the gluteus medius and tensor fasciae latae. Furthermore, the AL and AM showed increased activity while the hip was fully flexed and extended. This remarkable muscle activity around the flexion-extension reversal point during high-speed sprinting may stabilize the hip joint so that it resists dislocative force through the unique anatomical features of the hip adductor muscles, i.e. “shunt-” rather than “spurt-type” architectural characteristics.

著者

苅山 靖 藤井 宏明 森 健一 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.58, no.1, pp.91-109, 2013 (Released:2013-06-08)

参考文献数

24

被引用文献数

2 5

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This study aimed to clarify the 3-dimensional joint kinetics of the takeoff leg for the single-leg rebound jump (SRJ) and the double-leg rebound jump (DRJ). 14 male track and field athletes (sprinters, jumpers and decathletes) performed the SRJ and the DRJ with maximal effort. Kinematics and kinetics data were recorded using a Vicon T20 system (250 Hz) and force platforms (1000 Hz). The results of all the analyses were as follows: 1.  In the SRJ, hip joint work around the adduction-abduction and internal-external rotation axes was higher than in the DRJ, because of larger hip abduction and internal rotational torque in the SRJ. 2.  In the SRJ, hip abduction and internal rotation torque were larger than those in the DRJ. These may have been caused by the anatomical and mechanical differences between the SRJ and DRJ. 3.  In the SRJ, hip abduction torque affected the increment in jump height. This result suggests that hip abduction torque affects the higher jump height for a single leg to a greater extent in the SRJ than in the DRJ. 4.  In the SRJ, the trunk lateral flexion caused by trunk flexion torque reduced the lateral displacement of the center of gravity due to pelvic list. These results suggest that 1) the SRJ is an effective training tool for improvement of technique and force output ability for prioritization of power output at the hip internal rotators, especially the hip abductors in addition to the hip extensor, and 2) hip abduction torque in the SRJ has a role in both postural control and determining the increment in jump height. These findings will be useful for clarifying the most pertinent points related to the SRJ and for developing an effective method that can be applied to plyometrics.