Updated on 2024/04/13

Affiliation
Faculty of Sport Sciences, School of Sport and Sciences
Job title
Assistant Professor(without tenure)
Degree
(Ph.D. in Sport Sciences (Graduate School of Sport Sciences)) ( 2022.03 Waseda University )
(MSc in Sport Sciences (Graduate School of Sport Sciences)) ( 2019.03 Waseda University )
(BSc in Nutrition (School of Health and Nutrition)) ( 2016.03 Tokai Gakuen University )
Profile

免許/ 資格

・公認スポーツ栄養士 (JSPO Sports Dietitian) (2023年10月~)

・管理栄養士 (Registered Dietitian) (2016年6月~)

・栄養教諭一種  (Nutrition Teacher) (2016年4月~)

 

Research Experience

  • 2024.04
    -
    Now

    Surugadai University   Faculty of Sport Science,   Part-time Lecturer

  • 2023.04
    -
    Now

    Waseda University   Comprehensive Research Organization, Waseda Institute of Sports Nutrition   Concurrent Researcher

  • 2023.04
    -
    Now

    Waseda University   Faculty of Sport Sciences

  • 2022.09
    -
    Now

    Jumonji University   Faculty of Human Life The Department of Food and Nutrition   Part-time Lecturer

  • 2022.04
    -
    2023.03

    Waseda University   Waseda Institute of Sports Nutrition   Research Associate

Education Background

  • 2019.04
    -
    2022.03

    Waseda University   Graduate School of Sport Sciences  

  • 2017.04
    -
    2019.03

    Waseda University   Graduate School of Sport Sciences  

  • 2012.04
    -
    2016.03

    Tokai Gakuen University   School of Health and Nutrition   Department of Nutrition  

Committee Memberships

  • 2023.12
    -
    Now

    日本スポーツ栄養学会  国際交流委員

  • 2023.09
    -
     

    日本体力医学会特別大会-2023東京シンポジウム-  実行委員

Professional Memberships

  • 2022
    -
    Now

    Japan Society of Health Evaluation and Promotion

  • 2019
    -
    Now

    Professionals in Nutrition Exercise and Sport

  • 2019
    -
    Now

    American College of Sports Medicine

  • 2014
    -
    Now

    The Japan Sports Nutrition Association

Research Areas

  • Sports sciences   スポーツ栄養学

Research Interests

  • Sports nutrition

  • Relative energy deficiency in sport (REDs)

  • Bone health

Awards

  • Young Investigator Excellent Abstract Award

    2022.12   IUNS-ICN 22nd International Congress of Nutrition  

  • Hamano Yoshio Commemorative Award

    2021.08   Waseda University  

Media Coverage

 

Papers

  • Breakfast Skipping is Associated with Iron Deficiency in Young Female Workers

    Tatsuya Ishizu, Sihyung Lee, Mika Goshozono, Nozomi Miura,Honoka Tamamura, Madoka Mukai, Motoko Taguchi

      50 ( 3 ) 361 - 368  2023.05  [Refereed]

    Authorship:Lead author

    DOI

  • Association between serum uncarboxylated osteocalcin levels and nutritional intake in Japanese female athletes

    Tatsuya Ishizu, Suguru Torii, Motoko Taguchi

    Physical Activity and Nutrition   26 ( 3 ) 001 - 005  2022.09  [Refereed]

    Authorship:Lead author

     View Summary

    [Purpose] The current study aimed to determine the association between serum uncarboxylated osteocalcin (ucOC) levels and dietary vitamin K intake in female Japanese athletes.[Methods] The nutritional profile and food group intake of 52 Japanese female athletes were investigated using a digital photographic method with data obtained from 3-day dietary records. The food groups were categorized into 18 groups in line with the standard tables of food composition in Japan. Fasting blood samples were collected for serum ucOC levels, and dual-energy X-ray absorptiometry (DXA) evaluated body composition and bone parameters.[Results] The results showed that dietary vitamin K intake level was 235 ± 148 µg/day, and approximately 70% (n = 36) of participants consumed more than the adequate intake (AI) level, based on the Dietary Reference Intakes for Japanese females aged 18–29. Serum ucOC levels were negatively associated with daily vitamin K intake (r = −0.388, <i>P</i> = 0.004) and calcium (r = −0.596, <i>P</i> = 0.004) after adjusting for energy intake.[Conclusion] Our study revealed that serum ucOC levels were negatively associated with dietary vitamin K intake in female Japanese athletes. Serum ucOC levels reflected dietary vitamin K intake in female athletes. In summary, female athletes consume more vitamin K than the general population to maintain bone health. Furthermore, our results indicated that serum ucOC levels might be linked to dietary calcium intake.

    DOI

  • Habitual Dietary Status and Stress Fracture Risk Among Japanese Female Collegiate Athletes

    Tatsuya Ishizu, Suguru Torii, Motoko Taguchi

    Journal of the American Nutrition Association     1 - 8  2022.07  [Refereed]

    Authorship:Lead author

    DOI

    Scopus

  • Japanese female athletes with low energy availability exhibit low multiple food group intake and increased tartrate-resistant acid phosphatase 5b levels: a cross-sectional study

    Tatsuya Ishizu, Suguru Torii, Eri Takai, Nozomi Miura, Motoko Taguchi

    The Journal of Physical Fitness and Sports Medicine   11 ( 2 ) 107 - 116  2022.03  [Refereed]

    Authorship:Lead author

    DOI

  • Prebiotic Food Intake May Improve Bone Resorption in Japanese Female Athletes: A Pilot Study

    Tatsuya Ishizu, Eri Takai, Suguru Torii, Motoko Taguchi

    Sports   9 ( 6 ) 82 - 82  2021.06  [Refereed]

    Authorship:Lead author

     View Summary

    The aim of the present study was to clarify the influence of inulin and lactulose-fortified prebiotic food intakes on bone metabolism turnover among Japanese female athletes. The participants included 29 female athletes aged 18–25 years. They were requested to consume their habitual foods or drinks with one pack of prebiotic food every day for 12 weeks. Dietary intake, training time, body composition, blood sample, and fecal microbiota were assessed during this intervention period. Body composition, total energy intake, and training time of the participants revealed no significant changes during the intervention period. The occupation ratio of Bifidobacterium spp. was significantly increased at 3 and 4 weeks (18.0 ± 8.3% and 17.6 ± 8.5%, respectively) compared to that of pre-intervention (11.7 ± 7.3%) (p = 0.019 and p = 0.035, respectively). The serum TRACP-5b level was significantly decreased at 12 weeks (363 ± 112 mU/dL) compared to that at baseline (430 ± 154 mU/dL) (p = 0.018). These results suggest that the prebiotic food used in this study might have beneficial effects on bone health and gut microbial environment among female athletes. Further studies are warranted to identify the mechanism of the prebiotics–gut–bone axis.

    DOI

    Scopus

    3
    Citation
    (Scopus)

Books and Other Publications

Presentations

  • Factors Associated with Bone Parameters in Male Collegiate Athletes.

    Tatsuya Ishizu, Kazuki Kioka, Rikako Yoshitake, Suguru Torii, Koichi Watanabe, Naomi Omi, Motoko Taguchi

    ARIHHP Human High Performance Forum 2024 

    Presentation date: 2024.02

  • Prevalence of Surrogate Markers of Relative Energy Deficiency in Male Collegiate Athletes.

    Motoko Taguchi, Tatsuya Ishizu, Kazuki Kioka, Rikako Yoshitake, Koichi Watanabe, Suguru Torii, Naomi Omi

    ARIHHP Human High Performance Forum 2024 

    Presentation date: 2024.02

  • Relationship of body composition and sport types on bone mineral density in young female athletes

    Tatsuya Ishizu, Suguru Torii, Mika Goshozono, Scott B. Going, Motoko Taguchi

    American College of Sports Medicine 70th Annual Meeting 

    Presentation date: 2023.05

  • Association of serum uncarboxylated osteocalcin levels with dietary vitamin K, soy products, and vegetable intake in Japanese female athletes

    Tatsuya Ishizu, Suguru Torii, Motoko Taguchi

    IUNS-ICN 22nd International Congress of Nutrition 

    Presentation date: 2022.12

  • Nutritional Food Containing Inulin and Lactulose Reduces Bone Resorption Marker in Japanese Female Athletes.

    Tatsuya Ishizu, Eri Takai, Suguru Torii, Rie Ishizawa, Hiroko Murata, Mizuki Kato, Motoko Taguchi,

    American College of Sports Medicine 67th Annual Meeting 

    Presentation date: 2020.05

  • アスリートのための新たなスポーツフーズ

    石津達野

    女性アスリートシンポジウム『女性アスリートのコンディショニングと栄養』 

    Presentation date: 2020.01

  • 新たなスポーツフーズが女性アスリートの身体的コンディションに及ぼす影響

    石津達野, 高井恵理, 田口素子

    ハイパフォーマンススポーツカンファレンス 2019 

    Presentation date: 2019.10

  • 女性アスリートにおける貧血既往歴と習慣的な食事摂取状況との関連

    石津達野, 遠藤有香, 村田浩子, 田口素子

    日本スポーツ栄養学会第4回大会 

    Presentation date: 2017.08

▼display all

Research Projects

  • アスリートのエナジーアベイラビリティーと代謝相互作用の解明

    早稲田大学  日本学術振興会 科学研究費助成事業

    Project Year :

    2024.04
    -
    2027.03
     

  • 男性アスリートにおける骨密度と関連する栄養学要因の検討

    2023 年度国立大学法人筑波大学体育系ヒューマン・ハイ・パフォーマンス先端研究センター(ARIHHP) 公募型

    Project Year :

    2023.06
    -
    2024.02
     

Misc

  • スポーツにおける相対的エネルギー不足(RED-S)予防のための栄養の役割

    田口素子, 石津達野

    臨床整形外科   58 ( 4 ) 351 - 357  2023.04

     View Summary

    <文献概要>エナジー・アベイラビリティー(EA)の低下した状態が継続することにより,疲労骨折をはじめさまざまな健康障害が引き起こされることが報告されている.その予防のためには毎日の食事から運動量に見合うエネルギーを摂取することに加え,カルシウム,ビタミンD,ビタミンKなどの十分な摂取が必要である.毎食の食事は主食,主菜,副菜,牛乳・乳製品,果物をそろえた「アスリートの食事の基本形」に近づけるように指導する.整形外科医と公認スポーツ栄養士の連携による選手に対する栄養教育が必須である.

 

Syllabus

Teaching Experience

  • Sports Nutrition

    Surugadai University  

    2024.04
    -
    Now
     

  • Seminar for Freshmen Ⅲ

    Waseda University  

    2024.04
    -
    Now
     

  • Seminar for Freshmen Ⅱ

    Waseda University  

    2023.09
    -
    Now
     

  • Seminar for Freshmen Ⅰ

    Waseda University  

    2023.04
    -
    Now
     

  • Sports nutrition

    Jumonji University  

    2022.09
    -
    Now
     

 

Internal Special Research Projects

  • 若年男性アスリートにおけるlow energy availabilityのスクリーニングツールの検討

    2023  

     View Summary

    日常的に激しいトレーニングを行うアスリートは、トレーニングによって消費したエネルギー量に見合った食事からのエネルギー摂取量を確保することが難しい場合があり、その結果low energy availability (EA) に陥る場合がある。このエネルギー不足の状態であるlow EAは様々な生理指標に負の影響を与えることが報告されている。EAは食事からのエネルギー摂取量、運動時のエネルギー消費量及び除脂肪量を評価することによって算出できるが、スポーツ現場で正確にEAを評価することは極めて困難である。そのため、EA状態をスクリーニングするツールの検討が求められている。そこで、本研究の目的は日本人若年男性アスリートにおけるlow EAのスクリーニングツールの有用性を検討することとした。スクリーニングの結果に基づき、low-risk群とat-risk群に分類したところ、low EAに関連する血中内分泌指標は2群間で異なっており、スクリーニングツールは有用であることが示唆された。この研究に関連する成果について、国内でポスター発表を2件行った。また現在は国際学術誌への論文投稿に向けて準備を進めており、その成果は国際学術集会でも発表予定である。