Updated on 2023/12/26

 
OBATA Hiroki
 
Scopus Paper Info  
Total Paper Count: 0  Total Citation Count: 0  h-index: 10

Citation count denotes the number of citations in papers published for a particular year.

Affiliation
Institute of Liberal Arts Department of Humanities and Social Sciences
Job
Professor
External link

Research Interests

  • electrophysiology

Degree

  • The University of Tokyo  -  Ph.D.   2009.03

Biography in Kyutech

  • 2022.10
     

    Kyushu Institute of Technology   Institute of Liberal Arts   Department of Humanities and Social Sciences   Professor  

  • 2016.04
    -
    2022.09
     

    Kyushu Institute of Technology   Institute of Liberal Arts   Department of Humanities and Social Sciences   Associate Professor  

Academic Society Memberships

  • 2014.08   日本体力医学会   Japan

Papers

  • Different functional networks underlying human walking with pulling force fields acting in forward or backward directions Reviewed International journal

    Ogawa T., Obata H., Yokoyama H., Kawashima N., Nakazawa K.

    Scientific Reports   13 ( 1 )   2023.12

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1038/s41598-023-29231-6

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  • Cortical oscillations and interareal synchronization as a preparatory activity for postural response Reviewed International journal

    Fujio K., Obata H., Takeda K., Kawashima N.

    European Journal of Neuroscience   57 ( 9 )   1516 - 1528   2023.05

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1111/ejn.15956

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  • Effect of Long-Term Classical Ballet Dance Training on Postactivation Depression of the Soleus Hoffmann-Reflex Reviewed

    Hiroki Obata, GeeHee Kim, Tetsuya Ogawa, Hirofumi Sekiguchi, Kimitaka Nakazawa

    Motor Control   1 - 12   2022.01

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1123/mc.2021-0079

  • The effectiveness of Okayama University program during expansion period of COVID-19 infection Reviewed

    SUZUKI Hisao, KOBAYASHI Yuji, OTA Akemi, TAKAMARU Isao, KURASAKI Nobuko, EDAMATSU Chihiro, SUGA Masaki, SUMIMOTO Atsushi, SHITARA Kayo, YASUDA Tomohiro, NOGUCHI Kyoko, SHO Michiko, NOGAMI Reiko, MATSUI Hiroshi, TAKEDA Kohei, MIYAZAKI Masami, MIZUKAMI Masako, SHIOSHIMA Rie, NAKAYAMA Kyoichi, AKIHARA Yu, OBATA Hiroki, ITO Takehiko

    Japanese Journal of Physical Education and Sport for Higher Education ( Japanese Association of University Physical Eduation and Sports )   18 ( 0 )   49 - 55   2021.01

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    Language：Japanese   Publishing type：Research paper (scientific journal)

    <p>The expansion of COVID-19 infection had left no choice for our institution but to shift to on-line instructions instead of in-person instructions, which have resulted in significant decrease in the students’ physical activities. Under these circumstances, we developed the Okayama University (OU) program, which was an online instruction program for university physical education aimed to increase the students’ physical activities. The OU program consisted of endurance exercise, resistance training, and stretching exercise which were the exercise items that improve health related physical fitness. The physical activity and exercise standards of OU program met the traditional structured exercise program standard of American College of Sports Medicine (ACSM), the lifestyle physical activity program standard of joint creation of ACSM and U.S. Centers for Disease Control and Prevention, and the combination of above-mentioned program standards. Our OU program has been introduced on the website of Japanese Association of University Physical Education and Sports. As a result, we were able to provide a package of our teaching materials to 63 universities, and the package was used by 2,404 students in 24 universities. Among these 24 universities, 19 of them participated in this research, and 1,333 students evaluated the effectiveness of the OU program. The survey period was July and August 2020. The students who gave “Fair” to the difficulty score for theoretical learning in OU program was 73.6%. Seventy-point six percent of the students answered that their physical fitness improved since the beginning of the program, whereas 71.5% of them had routinized their physical activity. The degree-of-satisfaction average score of OU program were 4.0 points (max 5.0 points), and the students who answered either “Satisfied” or “Somewhat satisfied” were 72.4%. The comprehensive evaluation average score was 3.8 points (max 5.0 points), and the students who evaluated the program either “Very good” or “Good” were 69.5%. Since our OU program received high evaluation and its efficacy was established, it was suggested that the program was an effective on-line instruction material useful in university physical education.</p>

    DOI： 10.20723/jpeshe.18.0_49

    CiNii Research

  • Spatiotemporal characteristics of locomotor adaptation of walking with two handheld poles Reviewed

    Obata H., Ogawa T., Yokoyama H., Kaneko N., Nakazawa K.

    Experimental Brain Research   238 ( 12 )   2973 - 2982   2020.12

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    Language：English   Publishing type：Research paper (scientific journal)

    Pole walking (PW) has received attention not only as a whole-body exercise that can be adapted for elderly people with poor physical fitness but also as a possible intervention for the restoration of gait function in normal walking without the use of poles (i.e., conventional walking CW). However, the characteristics of PW, especially how and why PW training affects CW, remain unclear. The purpose of this study was to examine the characteristics of locomotor adaptation in PW from the perspective of kinematic variables. For this purpose, we compared the locomotor adaptation in PW and CW to that when walking on a split-belt treadmill in terms of spatial and temporal coordination. The result showed that adaptations to the split-belt treadmill in PW and CW were found only in interlimb parameters (step length and double support time ratios (fast/slow limb)), not in intralimb parameters (stride length and stance time ratios). In these interlimb parameters, the movement patterns acquired through split-belt locomotor adaptations (i.e., the aftereffects) were transferred between CW and PW regardless of whether the novel movement patterns were learned in CW or PW. The aftereffects of double support time and step length learned in CW were completely washed out by the subsequent execution in PW. On the other hand, the aftereffect of double support time learned in PW was not completely washed out by the subsequent execution in CW, whereas the aftereffect of step length learned in PW was completely washed out by the subsequent execution in CW. These results suggest that the neural mechanisms related to controlling interlimb parameters are shared between CW and PW, and it is possible that, in interlimb coordination, temporal coordination is preferentially stored in adaptation during PW.

    DOI： 10.1007/s00221-020-05954-0

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  • Effects on Postural Kinematics of Performing a Cognitive Task During Upright Standing Reviewed

    Hagio K., Obata H., Nakazawa K.

    Perceptual and Motor Skills   127 ( 4 )   639 - 650   2020.08

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    Language：English   Publishing type：Research paper (scientific journal)

    © The Author(s) 2020. The execution of cognitive tasks is known to alter postural sway during standing, but the underlying mechanisms are still debated. This study investigated how performing a mental task modified balance control during standing. We required 15 healthy adult males to maintain an upright stance under conditions of simply relaxing and maintaining normal quiet standing (control condition) or while performing a secondary cognitive task (mental arithmetic). Under each condition, we measured the participants’ center of pressure and used kinematic measurements for a quantitative evaluation of postural control modulation. We calculated the standard deviation of the joint angles (ankle, knee, and hip) and the estimated joint stiffness to measure joint mobility changes in postural control. To estimate the kinematic pattern of covariation among these joints, we used uncontrolled manifold analysis, an assessment of the strength of multijoint coordination. Compared to normal standing, executing the cognitive task while standing led to reduced movements of the ankle and hip joints. There were no significant differences in ankle stiffness or uncontrolled manifold ratios between the conditions. Our results suggest that when performing a secondary cognitive task during standing, neither changes in the modification of stiffness nor the strength of multijoint coordination (both of which preserve the center of mass position) explains changes in postural sway.

    DOI： 10.1177/0031512520919543

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  • “Paralympic Brain”. Compensation and Reorganization of a Damaged Human Brain with Intensive Physical Training Reviewed International journal

    Kimitaka Nakazawa, Hiroki Obata, Daichi Nozaki, Shintaro Uehara, Pablo Celnik

    Sports (Basel)   2020.04

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.3390/sports8040046

  • Cross-sectional comparison of the probabilistic structure in the distribution of pitching location among baseball pitchers of different ages Reviewed

    Ogawa T., Kobayashi H., Kuwata M., Obata H., Shinya M., Ijiri T., Miki T., Nakazawa K.

    Sports Biomechanics   2020.01

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    Language：English   Publishing type：Research paper (scientific journal)

    The present study was a cross-sectional comparison of probabilistic structure in the distribution of pitching location among baseball pitchers of various age groups (25 elementary school (ES), 20 junior high school (JH), 15 high school (HS), and 18 college students (CL)). In the results, despite the general age-dependent variations in pitching precision, the difference was reflected not only in error ‘size’ but also in the ‘shape’ of error as it was shown by fitting 95% confidence ellipse to the two dimensional distribution of pitch location. While the precision measure as a reflection of trial-by-trial variability of release timing (major axis length of the ellipse) was constant, minor axis length of the ellipse as a reflection of variability in the pitching form of each participant demonstrated significant differences among the groups. In the ES group particularly, the trial-by-trial variability in the trajectory angle of the throwing arm was significantly correlated with the minor axis length; this correlation was far greater than those in older groups. The present study is the first to demonstrate the detailed structure of the variability of pitching location of baseball dependent on age.

    DOI： 10.1080/14763141.2020.1822908

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  • Unique controlling mechanisms underlying walking with two handheld poles in contrast to those of conventional walking as revealed by split-belt locomotor adaptation Reviewed International journal

    237 ( 7 )   1699 - 1707   2019.07

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1007/s00221-019-05541-y

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  • Repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation Reviewed International journal

    14 ( 4 )   2019.04

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1371/journal.pone.0214818

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  • Short-term inhibition of spinal reflexes in multiple lower limb muscles after neuromuscular electrical stimulation of ankle plantar flexors Reviewed International journal

    237 ( 2 )   467 - 476   2019.02

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1007/s00221-018-5437-6

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  • Remarkable hand grip steadiness in individuals with complete spinal cord injury Reviewed

    Nakanishi T., Kobayashi H., Obata H., Nakagawa K., Nakazawa K.

    Experimental Brain Research   2019.01

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1007/s00221-019-05656-2

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  • Effects of breathing movement on the reduction of postural sway during postural-cognitive dual tasking Reviewed

    13 ( 5 )   2018.05

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1371/journal.pone.0197385

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  • Influence of motor imagery on spinal reflex excitability of multiple muscles Reviewed

    668   55 - 59   2018.03

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1016/j.neulet.2018.01.015

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  • Corticospinal excitability is modulated as a function of postural perturbation predictability Reviewed

    12   2018.02

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.3389/fnhum.2018.00068

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  • On the skilled plantar flexor motor action and unique electromyographic activity of ballet dancers Reviewed

    236 ( 2 )   355 - 364   2018.02

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1007/s00221-017-5131-0

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  • Short-term effects of electrical nerve stimulation on spinal reciprocal inhibition depend on gait phase during passive stepping Reviewed International journal

    38   151 - 154   2018.02

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1016/j.jelekin.2017.12.007

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  • Effects of anode position on the responses elicited by transcutaneous spinal cord stimulation Reviewed

    1114 - 1117   2017.09

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    Language：English   Publishing type：Research paper (international conference proceedings)

    DOI： 10.1109/EMBC.2017.8037024

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  • Baseball pitching accuracy: an examination of various parameters when evaluating pitch locations Reviewed

    16 ( 3 )   399 - 410   2017.07

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1080/14763141.2017.1332236

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  • Neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles Reviewed

    12 ( 6 )   2017.06

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1371/journal.pone.0180275

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  • 外乱の予測に応じた足関節底背屈筋の皮質脊髄路興奮性の事前調節

    藤尾 公哉, 小幡 博基, 河島 則天, 中澤 公孝

    理学療法学Supplement   2016 ( 0 )   2017.01

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    Language：Japanese   Publishing type：Research paper (other academic)

    <p>【はじめに，目的】</p><p></p><p>運動野から脊髄運動ニューロンに下降する皮質脊髄路（CST）は，ヒト二足立位の制御に関わる神経経路の一つである。これまでの研究で，足関節底背屈筋CSTの興奮性は，不安定な環境に暴露された際に上昇することが報告されており，フィードバック情報に応じて，姿勢要求に見合うように変調していると考えられる。</p><p></p><p>一方，姿勢外乱により不安定な環境が予測される時，CSTがどのように調節されるかは明らかではない。CSTが予測情報を利用して興奮性を調節しているのであれば，予測される外乱に応じてあらかじめ応答を設定していると考えられる。</p><p></p><p>本研究の目的は，足関節底背屈筋CSTの興奮性が，外乱の方位・強度の予測情報に応じて，先行して変調するかを明らかにすることであった。</p><p></p><p></p><p>【方法】</p><p></p><p>対象は健常な成人男性12名（27.3±5.6歳）であった。経頭蓋磁気刺激装置（TMS）を用い，姿勢外乱が印加される50ms前の運動誘発電位（MEP）を計測した。参加者には，プラットフォーム上（Motion-Base MB-150）で立位姿勢を保持するように指示した。外乱は，足底支持面の前後方向への水平移動を負荷した。今回の研究では，強度および方位を変えた3種類の外乱を用いた。実験条件は，それぞれの外乱が単独で加わる①前方・弱（3.5cm，10cm/s），②前方・強（7.0cm，25cm/s），③後方（7.0cm，25cm/s）と，3種の外乱が順不同に加わる④ランダム，さらに，外乱を負荷しない⑤外乱なし，を設けた。筋活動応答を，前脛骨筋（TA），ヒラメ筋（SOL）から導出した。統計処理は，各条件で得られたMEPの差を一元配置分散分析により比較した。統計的有意水準は5%とした。</p><p></p><p></p><p>【結果】</p><p></p><p>前脛骨筋MEPは，外乱なし，後方，前方・弱，ランダム，前方・強条件の順に増大していた。分散分析の結果，前脛骨筋MEPには条件間の主効果が認められた（F<sub>2.2</sub> <sub>24.7</sub>=14.9，p＜0.001）。事後解析において，後方以外の他の条件で外乱なし条件よりも有意に増大していた。またこれは外乱の強度・方位の影響を受け，前方・強条件で前方・弱および後方条件よりも有意な増大を示した。一方，ヒラメ筋MEPについては，条件間の主効果が認められなかった（F<sub>4 44</sub>=2.2，p=0.09）。</p><p></p><p></p><p>【結論】</p><p></p><p>本研究の結果から，外乱の予測によってTAのCSTの興奮性が事前に変調することが明らかとなった。また，この変調は，外乱の強度および方位に応じてスケーリングされることが分かった。このことは，無意識・無自覚に調節される立位の制御においても，随意運動と同じように，予測情報を利用して中枢神経系の応答が事前設定されていることを示唆している。また，TAとSOLの間で予測の効果が異なっており，このことは立位姿勢における両筋の役割の違いや，皮質脊髄路との連絡の強さの違いを反映していると考えられる。</p>

    DOI： 10.14900/cjpt.2016.0476

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  • The effects of temporal and spatial predictions on stretch reflexes of ankle flexor and extensor muscles while standing Reviewed

    11 ( 7 )   2016.07

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1371/journal.pone.0158721

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  • Effect of Different Joint Angle on Stretch Reflex Sensitivity in Lower Leg Muscles Reviewed

    Yamamoto S., Kumagai T., Obata H., Koyama H., Komeda T., Nakazawa K.

    Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings   2   1483 - 1486   2003.12

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  • Facilitation of both stretch reflex and corticospinal pathways of the tibialis anterior muscle during standing in humans Reviewed

    Nakazawa K., Kawashima N., Obata H., Yamanaka K., Nozaki D., Akai M.

    Neuroscience Letters   338 ( 1 )   53 - 56   2003.02

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    Excitability of both stretch reflex (SR) and motor evoked potential (MEP) elicited in the tibialis anterior (TA) muscle by transcranial magnetic stimulation were tested in standing humans. The results demonstrated significantly greater values for both SR and MEP in the TA while standing than while in the supine posture, although background electromyographic activity was silent in the two conditions. Taken together with previous reports that both pathways are facilitated in the TA at the early stance phase of human walking, our findings suggest that a common neural mechanism underlies both observations, one that might be functionally relevant for securing ankle joint stabilization during upright standing. © 2002 Elsevier Science Ireland Ltd. All rights reserved.

    DOI： 10.1016/S0304-3940(02)01353-8

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Publications (Books)

  • Medical Nordic Walking　水中ポール・ウォーキング

    宮下充正監修（Joint author）

    一般社団法人全日本ノルディック・ウォーク連盟  2022.02  （ ISBN:9784991158322 ）

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    Language：Japanese

  • Medical Nordic Walking　ノルディック・ウォークの医科学的基礎

    宮下充正監修（Joint author）

    一般財団法人全日本ノルディック・ウォーク連盟  2016.04 

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    Language：Japanese

Grants-in-Aid for Scientific Research

  • 末梢入力により誘導される脊髄神経回路の可塑性

    Grant number：26350564  2014.04 - 2016.03   基盤研究(C)

Other External Funds

  • ヒト脊髄運動学習に伴う脳内ネットワーク再編の解明

    2019.01 - 2020.03

    1. 上原生命科学財団研究助成金