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

vol.62, no.2, pp.575-586, 2017 (Released:2017-12-19)

参考文献数

29

被引用文献数

4 4

---

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 2 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

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

vol.63, no.2, pp.695-705, 2018-12-10 (Released:2018-12-20)

参考文献数

17

被引用文献数

2

---

The purpose of this study was to clarify the exertion of torque and motion related to the generation of mechanical energy in both hip joints during baseball batting. The participants were 98 male amateur baseball players (body height: 172.6±5.6cm, body weight: 70.3±8.1kg, age: 19.0±1.9yr, career: 11.0±2.8yr). The batting motion was recorded using a motion capture system (10cameras, 250Hz), and the ground reaction forces acting on each foot were estimated using 2 force plates (1000Hz). Hip joint angles were expressed as Euler angle of the thigh relative to the lower torso. Hip joint torques were calculated using inverse dynamics. Other kinetic variables–e.g. hip joint torque power, mechanical work by hip joint torque–were also calculated. The main results were as follows: 1. Throughout the analysis phase, there was no significant correlation between the bat head speed at impact and the angles of both hip joints. 2. For the hip joint on the pitcher side, the generation of mechanical energy by flexion and adduction torque was large during the phase before maximum pelvis rotational velocity. 3. For the hip joint on the catcher side, the generation of mechanical energy by extension torque was large in the phase before maximum pelvis rotational velocity. These results suggest that there are no differences in the kinematics of both hip joints depending on the bat head speed at impact. In addition, it is indicated that the ability to exert flexion and adduction torques for the hip joint on the pitcher side and the extension torque for the hip joint on the catcher side during baseball batting motion contribute to the generation of mechanical energy.

著者

中島 大貴 畔栁 俊太郎 安藤 優香 廖 本暠 山口 瑞生 桜井 伸二

出版者

日本スポーツパフォーマンス学会

雑誌

スポーツパフォーマンス研究 (ISSN:21871787)

巻号頁・発行日

vol.14, pp.1-12, 2022 (Released:2022-01-28)

参考文献数

11

---

野球において,投手が投じる変化球は,“キレ”という言葉を用いて評価されることが多い.しかし,このキレに対して野球選手がどの程度共通した認識を持っているのか,また,それは客観的な指標(速度や変化量などの運動学的特徴)で表すことができるのかは明らかではない.そこで本研究では,①野球投手が投じた変化球に対する評価者のキレの評価の一致度を検証すること,②そのキレの評価と実際に投球された変化球の運動学的特徴との関係を明らかにすることを目的とした.そのために,高校生投手12名,大学生投手20名が投じた各球種の運動学的特徴を調べ,高校生,大学生それぞれ投手と同一チームに所属する複数の捕手(評価者)に各投手の各球種のキレを5段階で評価させた.そして,評価者間のキレの評価の一致度,および,キレの評価とその運動学的特徴との関係を,高校生,大学生それぞれにおいて調べた.その結果,キレという言葉に対する認識が一致している球種と,そうでない球種があることがわかった.また,カーブ,カットボールにおいては,ボールの運動学的特徴でキレを定量化することができたが,スライダーやチェンジアップにおいてはできなかった.

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

---

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

中島 大貴 Hirotaka Nakashima

出版者

Chukyo University(中京大学)

巻号頁・発行日

2021-03-19

著者

中島 大貴 森下 義隆 八木 賢太郎 桜井 伸二

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.24, pp.8-18, 2020 (Released:2020-07-06)

参考文献数

23

---

In baseball, the flight distance of batted balls is influenced by not only the batted ball velocity but also the spin. Previous studies reported that balls batted toward the opposite field (right field for the right-handed batter) had greater side spin and curved horizontally. If batters could impart less side spin to the ball, flight distance would be expected to increase because the ball would travel more linearly. The purpose of this study was to investigate how the spin of a batted ball is affected by the vertical bat angle at impact. A pitching machine was used to launch balls toward a fixed bat. The bat was positioned at six different angles under two conditions; the bat's long axis was adjusted horizontally and the bat head was declined 40° lower than the bat grip. The batted ball spins resulting from the batted ball angles were compared between the conditions. There were significant correlations between the horizontal batted ball angle and the side spin of the batted balls in both conditions. There was no significant difference between the slopes of the regression lines for the conditions. In brief, balls batted toward the same direction had similar spin regardless of the conditions. Therefore, it is suggested that the batters should not attempt to control batted ball spin, and increasing their bat swing speed would be still the most important key factor to hit balls long distances toward the various directions.

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.18026, (Released:2018-09-07)

参考文献数

17

被引用文献数

2

---

The purpose of this study was to clarify the exertion of torque and motion related to the generation of mechanical energy in both hip joints during baseball batting. The participants were 98 male amateur baseball players (body height: 172.6±5.6cm, body weight: 70.3±8.1kg, age: 19.0±1.9yr, career: 11.0±2.8yr). The batting motion was recorded using a motion capture system (10cameras, 250Hz), and the ground reaction forces acting on each foot were estimated using 2 force plates (1000Hz). Hip joint angles were expressed as Euler angle of the thigh relative to the lower torso. Hip joint torques were calculated using inverse dynamics. Other kinetic variables–e.g. hip joint torque power, mechanical work by hip joint torque–were also calculated. The main results were as follows: 1. Throughout the analysis phase, there was no significant correlation between the bat head speed at impact and the angles of both hip joints. 2. For the hip joint on the pitcher side, the generation of mechanical energy by flexion and adduction torque was large during the phase before maximum pelvis rotational velocity. 3. For the hip joint on the catcher side, the generation of mechanical energy by extension torque was large in the phase before maximum pelvis rotational velocity. These results suggest that there are no differences in the kinematics of both hip joints depending on the bat head speed at impact. In addition, it is indicated that the ability to exert flexion and adduction torques for the hip joint on the pitcher side and the extension torque for the hip joint on the catcher side during baseball batting motion contribute to the generation of mechanical energy.

著者

廖 本暠 中島 大貴 半田 卓也 菊地 啓太 桜井 伸二

出版者

中京大学先端共同研究機構体育研究所

雑誌

中京大学体育研究所紀要 = BULLETIN OF RESEARCH INSTITUTE OF HEALTH AND SPORT SCIENCES CHUKYO UNIVERSITY

巻号頁・発行日

vol.36, no.1, pp.55-62, 2022-03-31

著者

中島 大貴 塚元 佑真 樗澤 寧々 井上 沙美 桜井 伸二

雑誌

中京大学体育研究所紀要 = BULLETIN OF RESEARCH INSTITUTE OF HEALTH AND SPORT SCIENCES CHUKYO UNIVERSITY

巻号頁・発行日

vol.34, pp.71-75, 2020-03-31