著者

紅楳 英信 横澤 俊治 山辺 芳 白崎 啓太 湯田 淳

出版者

一般社団法人 日本体育学会

雑誌

日本体育学会大会予稿集 第66回(2015) (ISSN:24241946)

巻号頁・発行日

pp.289, 2015-08-25 (Released:2017-04-06)

著者

真鍋 芳明 横澤 俊治 尾縣 貢

出版者

The Japanese Society of Physical Fitness and Sports Medicine

雑誌

体力科学 (ISSN:0039906X)

巻号頁・発行日

vol.53, no.3, pp.321-336, 2004-06-01 (Released:2010-09-30)

参考文献数

36

被引用文献数

7 5

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The purpose of this study was to compare hip and knee joint extension torque and the activity of eight muscles around the hip and knee joints during three squat exercises with different movements.Ten male athletes performed three different squats (Normal squat : NS, Knee push squat : KPS, Hip drive squat : HDS) . KPS is the type of squat which emphasizes knee joint movement without moving the hip joint position back and forth. On the other hand, HDS is the type of squat which emphasizes hip joint movement, while keeping the knee joint position fixed. Kinematic and kinetic variables such as angle, angular velocity, net torque and power of the joints of the lower extremity were calculated during the descending and ascending phase of each squat. At the same time, surface electrodes were placed on eight muscles of the lower extremity, and %iEMG was also calculated during the same phases.During the descending phase, Elector spinae muscle activity and hip joint extension torque was significantly greater for HDS than KPS. Rectus femoris and Vastus lateralis muscle activity was significantly greater for KPS than HDS. In addition, KPS showed significantly greater knee joint extension torque than HDS and NS. At the ascending phase, Elector spinae, Glueus maximus and Biceps femoris muscle activity, and hip joint extension torque was significantly greater for HDS than KPS and NS. Rectus femoris muscle activity and knee joint extension torque was significantly greater for KPS than HDS and NS.These results suggest that HDS is effective for selectively training the hip extensor, and KPS is effective for training the Rectus femoris muscle.

著者

紅楳 英信 横澤 俊治 相田 裕次 湯田 淳

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

vol.64, 2013

著者

紅楳 英信 横澤 俊治 湯田 淳

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

vol.62, 2011

著者

横澤 俊治 熊川 大介 荒川 裕志 勝亦 陽一 赤木 亮太

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.15082, (Released:2016-04-07)

参考文献数

23

被引用文献数

4 2

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The purpose of this study was to identify the biomechanical factors limiting distance and the jump technique in the maximum effort standing long jump. The limiting factors and jump technique were identified through an analysis of the relationship between patterns of joint powers in the propulsion phase of the standing long jump and maximum isokinetic strength of the lower limb. The participants were 11 male athletes specializing in different events. Isokinetic strength of the extensor muscles at the ankle (30 and 90 deg/s), knee (60 and 180 deg/s), and hip (60 and 180 deg/s) joints was evaluated by dynamometry. Joint powers in the propulsion phase of standing long jump were calculated by inversed dynamics methods using digitized two-dimensional coordinate data (50 Hz) and ground reaction force data (500 Hz). Pearson's product-moment correlation analyses were used to assess the relationships between jump distance, joint powers over the propulsion phase, and isokinetic strength of the lower limb joints. The results indicated the following.  1. The magnitude of the body center of mass velocity and whole body mechanical energy at toe-off were correlated with jump distance (velocity: r=0.857, p<0.01, energy: r=0.926, p<0.01).  2. Peak powers at the knee and hip joints over the propulsion phase, normalized to body mass, were correlated with jump distance (knee: r=0.767, p<0.01, hip: r=0.723, p<0.05).  3. Isokinetic extensor strength at the ankle, knee and hip joints, normalized to body mass, did not correlate with peak power at the corresponding joint over the propulsion phase. Also, only knee extensor strength at 60 deg/s was correlated with jump distance (r=0.652, p<0.05).  4. Knee extension torque at maximum knee flexion, which is used as an index of countermovement, was correlated with jump distance (r=0.836, p<0.01) and peak knee power (r=0.765, p<0.01). In one participant who had the highest ratio of peak powers over the propulsion phase to isokinetic strength, knee extensor power was enhanced by increasing the knee extension torque with countermovement and coupling of the arm swing to knee extension during the propulsion phase.  Therefore, although the jump distance depended on the lower limb joint powers over the propulsion phase, the power was not directly modulated by isokinetic strength. This phenomenon might be derived from strategies that enhanced lower limb power with countermovement and coupling of the arm swing to lower limb motion.

著者

原 樹子 立 正伸 横澤 俊治 平野 裕一

出版者

独立行政法人 日本スポーツ振興センター国立スポーツ科学センター

雑誌

JAPANESE JOURNAL of ELITE SPORTS SUPPORT (ISSN:21888183)

巻号頁・発行日

vol.1, pp.21-31, 2008 (Released:2019-09-04)

参考文献数

19

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本研究では,スクワットジャンプの動作初期の股関節角度の違いが跳躍高に与える影響について検討し,体力測定や競技の現場に役立つ知見を提示することを目的とした.被験者にマットスイッチ上で,3種の股関節初期角度(個人が至適と考える任意の角度:SJV,最大伸展角度:SJL,最小伸展角度:SJS)からジャンプを行わせ,同時に矢状面より画像を撮影し,跳躍高と動作初期の下肢関節角度を求めた.股関節の初期角度はSJL,SJV,SJSそれぞれ91.6±13.3 ,70.0±19.5,49.7±11.0°であり,有意差が見られたのはSJL>SJS,SJV>SJS,SJL>SJVであった.跳躍高はSJL,SJV,SJSそれぞれ0.34±0.05 m,0.37±0.04 m,0.40±0.06 mであり,有意差が見られたのはSJL<SJS(17.6%増加),SJV<SJS(8.1%増加),SJL<SJV(8.8%増加)であった.被験者の任意の股関節初期角度(SJV;70.0±19.5°)はSJSとSJLのほぼ中間であった.以上の結果,股関節の初期角度を個人が至適と考える任意の角度ではなく,可能な限り小さくするほうが,跳躍高が増加することがわかった.

著者

法元 康二 阿江 通良 横澤 俊治 藤井 範久

出版者

日本コーチング学会

雑誌

コーチング学研究 (ISSN:21851646)

巻号頁・発行日

vol.24, no.2, pp.139-152, 2011

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<p>&nbsp;&nbsp;&nbsp;&nbsp;The purpose of this study was to investigate technical factors relating to the maintenance of walking speed in race walking in official 20km races. Thirty-five elite race walkers were analyzed as subjects by using VTR camera (60 Hz) at 4-8km and 14-18km point during 20km official race. The results were as follows. <BR>&nbsp;&nbsp;&nbsp;&nbsp;Decreases in the recovery hip and knee joint torques resulted in decreases in the backward joint forces at the hip and knee, which decreased the joint force power at the recovery hip and knee and the mechanical energy flow from the recovery leg to the torso during the second half of the recovery phase. Therefore, decreases in the joint force at the recovery hip and knee decreased the mechanical energy flow, which might lead to decrease in the walking speed.</p>