2024, 22, 2, 96, 100

Refereed, Acta Psychologica, Comparison of force and timing control in periodic isometric leg extension., 2024, 246, 104258, Scientific journal, 10.1016/j.actpsy.2024.104258

Refereed, Journal of Motor Learning and Development, Ability of adjusting grip strength from childhood to adulthood, Ohtaka C; Fujiwara M, 2024, 12, 142, 154, Scientific journal, 10.1123/jmld.2022-0036

Refereed, 2023, 95, 42, 51, 10.5332/hatsuhatsu.2023.95_42

Refereed, Isokinetics and Exercise Science, Effect of force adjustment modalities on characteristics for force generation and relaxation., 2023, 31, 251, 263, 10.3233/IES-220121

Refereed, The Journal of Physical Fitness and Sports Medicine, The Japanese Society of Physical Fitness and Sports Medicine, The effects of subjective effort on overground and treadmill running: A comparative analysis, Hasebe F; Miura M; Ono K; Goto Y; Nakata H; Ohtaka C; Fujiwara M, 2023, 12, 2, 45, 57, Scientific journal, 10.7600/jpfsm.12.45

2022, 34, 4, 257, 263

Refereed, 2022, 1, 1, 11, Research institution

Refereed, Journal of Motor Learning and Development, The developmental progression and sex differences in agility during continuous two-footed jumping among children aged 4 to 16 years., Muro A; Takatoku N; Ohtaka C; Fujiwara M; Nakata H, 2022, 11, 71, 85, Scientific journal

Not Refereed, 2022, 24, 1, 12, 23

Refereed, Japan Journal of Human Growth and Development Research, The characteristics for grading ability of gripping, jumping, and throwing in later childhood, Chiaki Ohtaka; Motoko Fujiwara, 2022, 93, 32, 44, Scientific journal, 10.5332/hatsuhatsu.2022.93_32

Refereed, 2022, 71, 3, 271, 278, 10.7600/jspfsm.71.271

Refereed, Journal of Physical Fitness and Sports Medicine, Motor control characteristics for simultaneous bilateral asymmetrical tasks performed by upper limbs, Ono K; Hasebe F; Miura M; Ohtaka C; Fujiwara M, 2022, 11, 2, 97, 106, Scientific journal, 10.7600/jpfsm.11.97

Refereed, Journal of Human Sport and Exercise, Force control characteristics for generation and relaxation compared between the upper and lower limbs., Ohtaka C; Fujiwara M, 2022, 17, 1, 181, 196, Scientific journal, 10.14198/jhse.2022.171.17

Refereed, Research Journal of Sport Science in Nara Women’s University, Characteristics of ball throwing motion among young children from the viewpoint of two-dimensional motion analysis, 2021, 23, 1, 1, 10, Research institution, 2021_二次元動作解析からみた幼児のボール投げ動作の特徴.pdf, False

Refereed, Journal of Motor Learning and Development, Kinematic characteristics of standing long jump in young children aged 4 to 5 years old., Ogawa M; Ohtaka C; Fujiwara M; Nakata H, 2021, 9, 80, 94, Scientific journal

Refereed, The Japanese Journal of Ergonomics, Japan Ergonomics Society, The Effect of Force Level Condition before Controlling on the Characteristics of Grading, Chiaki OHTAKA; Motoko FUJIWARA, 2021, 57, 1, 34, 41, Scientific journal, 10.5100/jje.57.34

Refereed, Postural control with external perturbation on an unstable support surface: Effect of disturbance magnitude and predictability, Miura M; Ono K; Hasebe F; Ohtaka C; Fujiwara M, 2020, 22, 2, 1, 11, Research institution, 2021_不安定板上での外乱に対する姿勢制御外乱の大きさおよび予測の有無の影響.pdf, False

Refereed, Research Journal of Sport Science in Nara Women’s University, Relationship between the subjective and objective parameters for accurate force generation and relaxation., Ohtaka C; Fujiwara M, 2020, 22, 1, 1, 11, 2020_Relationship between the subjective and objective parameters for accurate force generation and relaxation.pdf, False

Refereed, Research Journal of Sport Science in Nara Women’s University, The relationship between continuous bilateral hop and basic exercise ability among young children, Continuous bilateral hop has been used to evaluate a person's agility by focusing on the movement time. In the present study, we examined the movement time as well as hopping pattern score on continuous bilateral hop, and investigated the relationship between continuous bilateral hop and basic motor ability (25-m sprint, tennis ball throwing and standing long jumping) among 131 young children aged 4 to 5 years. The movement time was significantly shorter in 5- than in 4-year-old children, but the hopping pattern score did not change with increasing age. The score was significantly higher in girls than in boys, while the movement time was significantly shorter in boys than in girls. Moreover, a significant correlation was observed between the movement time and basic motor ability (25-m sprint and standing long jumping), the score and basic motor ability (25-m sprint, tennis ball throwing and standing long jumping). These data suggest that continuous bilateral hop can be used as indexes for agility as well motor coordination in young children., 2020, 22, 1, 12, 21, Research institution, 2020_幼児における両足連続跳び越しの質的評価と基礎的運動能力との関係性の検討.pdf, False

Refereed, Descente Sports Science, Ability of adjusting the grip strength in childhood, Ohtaka C; Nakata H; Fujiwara M, 2020, 41, 244, 251, 2020_幼少期における筋出力調節能力の発達過程に関する研究.pdf, False

Refereed, Journal of Motor Behavior, Force control characteristics for generation and relaxation in the lower limb., Ohtaka C; Fujiwara M, 2019, 51, 331, 341, Scientific journal, 10.1080/00222895.2018.1474337

Refereed, Research Journal of Sport Science in Nara Women’s University, The relationship between physical fitness and intelligence tests among young children: focusing on changes over 15 years, 2019, 21, 2, 1, 9, Research institution, 2019_幼児の体力的特性と知能特性との関連についての検討_15年の推移に着目して.pdf, False

Refereed, ProS One, The difference in hemodynamic responses between dominant and non-dominant hands during muscle contraction and relaxation: An fNIRS study., Yokoyama N; Ohtaka C; Kato K; Kubo H; Nakata H, The present study used functional near-infrared spectroscopy (fNIRS), and investigated the differences in neural activation of ipsi- or contralateral hemispheres between right dominant and left non-dominant hands among right-handed subjects using consecutive motor tasks with muscle contraction and relaxation. The subjects performed tasks under four conditions: (1) right hand up (R-Up), (2) left hand up (L-Up), (3) right hand down (R-Down), and (4) left hand down (L-Down). The peak amplitude of oxy-Hb was significantly larger at the contralateral than ipsilateral hemisphere in the premotor area (PM) under the R-Up condition, and no significant differences were observed between contra- and ipsilateral hemispheres under the L-Up condition. In addition, the peak amplitude was more negative at the contra- than ipsilateral hemisphere in the PM under the R-Down condition, while the peak amplitude was significantly more negative at the ipsi- than contralateral hemisphere in the PM under the L-Down condition. These results suggest that the PM of the left hemisphere among right-handed subjects plays an important role in muscle contraction and relaxation with force control., 2019, 14, 7, e0215736, Scientific journal, True, 10.1371/journal.pone.0220100

Refereed, Journal of Physical Fitness and Sports Medicine, Effect of switching force control direction on consecutive compared to discrete adjustment., Ohtaka C; Fujiwara M, 2019, 8, 173, 180, Scientific journal, 10.7600/jpfsm.8.173

Refereed, 2019, 40, 47, 57

Refereed, Neuroscience Letters, Remote effects on corticospinal excitability during motor execution and motor imagery., Shironouchi F; Ohtaka C; Mizuguchi N; Kato K; Kakigi R; Nakata H, 2019, 707, 134284, Scientific journal, 10.1016/j.neulet.2019.134284

Refereed, 2019, 21, 1, 21, 29, Research institution, 2019_幼児期の運動遊びプログラムにおける調整力_サーキット遊びおよびリレー遊びの実践から.pdf, False

Refereed, Japan Journal of Physical Education, Health and Sport Sciences, Ability of young children to control their grip strength, Ohtaka C; Umemoto M; Fujiwara M, 2019, 64, 229, 236, Scientific journal, 10.5432/jjpehss.18084

Refereed, Japan Journal of Physical Education, Health and Sport Sciences, A strategy for adjusting the distance of the standing long jump in young children, Ohtaka C; Fujiwara M, 2018, 63, 281, 290, Scientific journal, 10.5432/jjpehss.17091

Refereed, 2018, 22, 25, 30

Refereed, Research Journal of Sport Science in Nara Women’s University, The relationship between cognitive styles and darts performance, Imanaka M; Ohtaka C; Fujiwara M; Nakata H, 2018, 20, 1, 13, Research institution, 2018_認知スタイルとダーツパフォーマンスの関係性の検討.pdf, False

Not Refereed, 2018, 22, 26, 32

Refereed, Japan Journal of Human Growth and Development Research, The developmental process of the "foresee-movement" among young children in catching a bouncing ball: data from a two-year longitudinal survey, Umemoto M; Ohtaka C; Fujiwara M, 2017, 74, 44, 55, Scientific journal, 10.5332/hatsuhatsu.2017.74_45

Refereed, Annual Reports of Graduate School of Humanities and Sciences, The relationship between force control strategy and performance for force generation and relaxation, Ohtaka C, 2017, 32, 63, 79, Research institution

Not Refereed, A study of voluntary force control : Difficulty of force relaxation, 2017, 64, 1, 48, 53

Refereed, Research Journal of Sport Science in Nara Women’s University, Variation of children’s body image in the physical education: Practice of mat exercise focused on the diversity of movements, Ohtaka C; Takezawa M, 2017, 19, 29, 37, Research institution, 2017_体育学習における子どもたちの身体イメージの変容_動きを広げるマット運動の授業実践から.pdf, False

Refereed, PERCEPTUAL AND MOTOR SKILLS, SAGE PUBLICATIONS INC, Control Strategies for Accurate Force Generation and Relaxation, Chiaki Ohtaka; Motoko Fujiwara, Characteristics and motor strategies for force generation and force relaxation were examined using graded tasks during isometric force control. Ten female college students (M age=20.2 yr., SD=1.1) were instructed to accurately control the force of isometric elbow flexion using their right arm to match a target force level as quickly as possible. They performed: (1) a generation task, wherein they increased their force from 0% maximum voluntary force to 20% maximum voluntary force (0%-20%), 40% maximum voluntary force (0%-40%), or 60% maximum voluntary force (0%-60%) and (2) and a relaxation task, in which they decreased their force from 60% maximum voluntary force to 40% maximum voluntary force (60%-40%), 20% maximum voluntary force (60%-20%), or to 0% maximum voluntary force (60%-0%). Produced force parameters of point of accuracy (force level, error), quickness (reaction time, adjustment time, rate of force development), and strategy (force wave, rate of force development) were analyzed. Errors of force relaxation were all greater, and reaction times shorter, than those of force generation. Adjustment time depended on the magnitude of force and peak rates of force development and force relaxation differed. Controlled relaxation of force is more difficult with low magnitude of force control., Oct. 2016, 123, 2, 489, 507, Scientific journal, 10.1177/0031512516664778

Refereed, Research Journal of Sport Science in Nara Women’s University, Analysis of the upper limb in basketball dribbling: A focus on differences in proficiency and tempo, 2016, 18, 35, 46, Research institution, 2016_バスケットボールのドリブルにおける上肢の動作分析_熟練度とテンポの違いに着目して.pdf, False

Refereed, Research Journal of Sport Science in Nara Women’s University, The motion characteristics of the forehand stroke on ball speed in tennis, Tanaka C; Ohtaka C; Fujiwara M, 2016, 18, 13, 24, Research institution

Refereed, Research Journal of Sport Science in Nara Women’s University, Practice about "expressive movements" in the practice of mat exercise for physical education in junior High school, Ohtaka C; Nakagawa M, 2016, 18, 79, 86, Research institution

Refereed, Japan Journal of Physical Education, Health and Sport Sciences, Japan Society of Physical Education, Health and Sport Sciences, Effect of switching the control direction on force control using isometric leg extension, Ohtaka C; Fujiwara M, In this study, we investigated the effects of differing control processes on the duration of zero-velocity in force control and force level control accuracy and quickness using isometric leg contraction tasks. Eleven participants were instructed to adjust the target force from 20% maximal voluntary contraction (MVC: 20% task) or from 60%MVC (60% task) to 20%, 40%, or 60%MVC after relaxing completely. The participants were instructed to control their force as quickly and as accurately as possible on receiving a visual stimulus, and the force produced by the participants was recorded. We investigated the differences in the task (20% or 60%MVC) and target (20%, 40%, or 60%MVC) force levels. We found that the target force level in the 20% task was higher than during the other target force levels for both tasks. The duration of zero-velocity was longer during the 60% task than in the 20% task for all target force levels. Before and after the period of zero-velocity, relaxation and re-adjustment time were longer during the 60% task than during the 20% task for all target force levels. Furthermore, the re-adjustment time was longer in the 60% task than in the 20% task for all target force levels; re-adjustment time was also found increase successively for the 20%, 40% and 60% MVC target force levels. Therefore, our findings suggest that during control the slight magnitude, accurate control of the force was difficult, irrespective of the magnitude of the force before relaxing completely. Moreover, the duration of zero-velocity became longer with greater magnitudes of force before relaxing completely, which affected the quickness at which force control was achieved after switching the control direction.
, 2016, 61, 2, 489, 501, Scientific journal, 10.5432/jjpehss.15102

Not Refereed, 2016, 20, 4, 182, 188

Refereed, 2016, 7, 71, 9, 17, Scientific journal, 10.5332/hatsuhatsu.2016.71_9

Refereed, Annual Reports of Graduate School of Humanities and Sciences, Effects of control direction on the accuracy of force control, Ohtaka C, 2015, 31, 115, 125

Refereed, Research Journal of Sport Science in Nara Women’s University, The effects of "Force relaxation" level on force control, Ohtaka C; Fujiwara M, 2015, 17, 1, 8

Refereed, Research Journal of Sport Science in Nara Women’s University, Nara Women's University, The effects of “Force relaxation” on quickness of force control, Ohtaka C; Fujiwara M, 2014, 16, 1, 8

Refereed, Research Journal of Sport Science in Nara Women’s University, The effects of "Force relaxation" on accuracy of force control, Ohtaka C; Fujiwara M, 2013, 15, 37, 46, Research institution

Not Refereed, 2020, 36, 72

Poster presentation, 2024

Oral presentation, Nov. 2023

Poster presentation, Sep. 2023

Ohtaka C; Chishiro S; Takahara N; Yamamoto K; Fujiwara M; Shibasaki M, 28th Annual Congress of the European College of Sport Science, Characteristics of muscle stiffness during isometric contraction and relaxation by shear wave elastography, Poster presentation, Jul. 2023

Oral presentation, Mar. 2023

Oral presentation, Mar. 2023

Oral presentation, 2023

Poster presentation, 12 Nov. 2022

Oral presentation, 31 Jul. 2022

Oral presentation, 20 Mar. 2022, 20 Mar. 2022 - 21 Mar. 2022

2021, 17 Sep. 2021 - 19 Sep. 2021

2021, 07 Sep. 2021 - 09 Sep. 2021

2021, 07 Sep. 2021 - 09 Sep. 2021

2021, 07 Sep. 2021 - 09 Sep. 2021

2021, 07 Sep. 2021 - 09 Sep. 2021

Oral presentation, 09 Sep. 2021

Oral presentation, 13 Mar. 2021, 13 Mar. 2021 - 14 Mar. 2021

Others, Feb. 2021

Poster presentation, 2020

Poster presentation, 2020

Poster presentation, 2020

Poster presentation, 2020

Poster presentation, 2020

Others, 2020

Poster presentation, 2020

Oral presentation, 2019

Public discourse, 2019

Poster presentation, 2019, False

Poster presentation, 2019, False

Poster presentation, 2019, False

Poster presentation, 2019, False

Oral presentation, 2018

Poster presentation, 2018

Poster presentation, 2018

Poster presentation, 2018

Poster presentation, 2018

Poster presentation, 2018

Others, 2018

Poster presentation, 2017

Poster presentation, 2017

Poster presentation, 2017

Public discourse, 2017

Oral presentation, 2017

The 17th International Conference on Environmental Ergonomics (Kobe, Japan), 15th November, 2017., Control strategies for accurate force generation and relaxation in isometric contraction of lower limb., Poster presentation, 2017

Oral presentation, 2016

Poster presentation, 2016

Poster presentation, 2016

Oral presentation, 2016

Poster presentation, 2016

Poster presentation, 2016

Poster presentation, 2016

Poster presentation, 2016

Poster presentation, 2016

Poster presentation, 2015

Poster presentation, 2015

Poster presentation, 2015

Poster presentation, 2015

Poster presentation, 2015

Poster presentation, 2015

Poster presentation, 2015

Poster presentation, 2015

Poster presentation, 2014

Poster presentation, 2014

Poster presentation, 2014

Poster presentation, 2014

Poster presentation, 2013

Poster presentation, 2013

Poster presentation, 2012

Poster presentation, 2012

Poster presentation, 2012

Poster presentation, 2012

Japan society, 21 Mar. 2022