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Methods include 64 junior high school soccer players completing the FFQ and providing dietary records for three nonconsecutive days, with ranking estimates and correlation analyses to compare FFQ versus dietary records. Results report median crude and energy-adjusted correlations plus intraclass correlation and cross-classification accuracy. Conclusion supports FFQJA as a suitable tool for ranking and categorizing junior high school athletes.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/food-frequency-questionnaire-for-japanese-athletes-validation-with-junior-high-school-athletes/459895/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/food-frequency-questionnaire-for-japanese-athletes-validation-with-junior-high-school-athletes/459895.png","ImageObject",300,407,{"name":92,"@type":93},"Stanley","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-04","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What was the purpose of the study?","Question",{"text":112,"@type":113},"To assess the validity of a food frequency questionnaire developed for Japanese athletes (FFQJA) in junior high school students.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How were the FFQ results validated in junior high school soccer players?",{"text":117,"@type":113},"Participants completed the FFQ and provided dietary records for three nonconsecutive days, and the study compared ranking estimates and correlation metrics between both methods.",{"name":119,"@type":110,"acceptedAnswer":120},"What did the study conclude about FFQJA for younger athletes?",{"text":121,"@type":113},"FFQJA was found to be valid for Japanese junior high school soccer players and could be used to rank and categorize individuals.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},459895,1790815129,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":44,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144,"preview_page_count":4},2336477405376,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","OPEN ACCESS  \n[https://doi.org/10.20463/pan.2025.0031](https://doi.org/10.20463/pan.2025.0031)  \n2025;29(4):023-031  \nReceived: 2025/09/10, Revised: 2025/10/26, Accepted: 2025/10/30, Published: 2025/12/30  \n©2025 Yosuke Nagashima et al.; License Physical Activity and Nutrition. This is an open access article distributed under the terms of the creative commons attribution license ([https://creativecommons.org/l](https://creativecommons.org/l)icenses/by-nc/2 .0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.  \n*Corresponding author : Yosuke Nagashima  \nDepartment of Health Science, Musashigaoka Junior College, 111-1 Minamiyoshimi, Yoshimi, Hiki-gun, Saitama 355-0154, Saitama, Japan.  \nTel: +81-493-54-6756  \nE-mail: [nagashima-y@musashigaoka.ac.jp](nagashima-y@musashigaoka.ac.jp)  \n©2025 The Korean Society for Exercise Nutrition  \n[Purpose] To investigate the validity of a food frequency questionnaire (FFQ) developed for Japanese athletes (FFQJA) among junior high school students.  \n[Methods] Sixty-four junior high school soccer players (13-15 years old) completed the FFQ and provided dietary records (DRs) for 3 nonconsecutive days (2 weekdays and 1 weekend day). Individual ranking estimates, crude Spearman’s correlation coefficients, and energy-adjusted correlation coefficients were used to validate the FFQ. To evaluate the mean estimates, the differences and percentage differences between the results obtained from the DRs and FFQ were calculated. The consistency of intakes between the two methods and the validity of classification were evaluated.[Results] The median crude correlation coefficients between the questionnaire responses and DRs were 0.483 (range: 0.350-0.708) and 0.386 (range: 0.191- 0.684) for nutrients and food groups, respectively. The median energy-adjusted correlation coefficients were 0.477 (range: 0.340-0.722) and 0.384 (range:−0.112 to 0.744), respectively. The median percentage differences were −7.2 and −17.6, respectively, and the median intraclass correlation coefficients were 0.469 and 0.214, respectively. Cross-classification analysis showed that the median kappa values were 0.350 and 0.275, respectively. The misclassification rate was 3% for nutrients and 6% for food groups.  \n[Conclusion] The FFQ developed and validated for Japanese athletes was found to be valid for Japanese junior high school soccer players. Therefore, the FFQJA could be a suitable tool for ranking and categorizing individuals among Japanese junior high school athletes.  \n[Keywords] food frequency questionnaire, Japanese athletes, junior high school athletes, dietary assessment, validation, ranking individuals  \nFood frequency questionnaire for Japanese athletes: validation with junior high school athletes  \nYosuke Nagashima1* / Masaharu Kagawa2 / Akiko Horikawa3 / Akiyo Shiohara4 / Ayana Mitsume1 / Kazuko Ishikawa-Takata5  \n1. Department of Health Science, Musashigaoka Junior College, Saitama, Japan  \n2. Institute of Nutrition Sciences, Kagawa Nutrition University, Saitama, Japan  \n3. Department of Human Development and Sport Science, Tokyo International University, Saitama, Japan  \n4. Faculty of food and nutritional sciences, Toyo University, Saitama, Japan  \n5. Faculty of Health and Sports Sciences, Toyo University, Tokyo, Japan  \nINTRODUCTION  \nAdequate dietary intake is important for normal growth and development, maintaining health and well-being, reducing the risk of illness and injury, and optimizing sports performance in junior athletes1. Diet is routinely assessed by nutrition professionals to evaluate whether an individual is achieving specific health and sports nutrition targets2. However, the accurate nutritional assessment of athletes in practical situations is difficult3.  \nIn epidemiological studies, food frequency questionnaires (FFQs) have been used as effective measures for assessing habitual dietary patterns. As dietary habits vary gre","cbCaihKdbfrNmr6Z","https://ap.wps.com/l/cbCaihKdbfrNmr6Z","pdf",971884,"English","# Introduction\n# Purpose and Methods\n# Results\n# Conclusion","[{\"question\":\"What was the purpose of the study?\",\"answer\":\"To assess the validity of a food frequency questionnaire developed for Japanese athletes (FFQJA) in junior high school students.\"},{\"question\":\"How were the FFQ results validated in junior high school soccer players?\",\"answer\":\"Participants completed the FFQ and provided dietary records for three nonconsecutive days, and the study compared ranking estimates and correlation metrics between both methods.\"},{\"question\":\"What did the study conclude about FFQJA for younger athletes?\",\"answer\":\"FFQJA was found to be valid for Japanese junior high school soccer players and could be used to rank and categorize individuals.\"}]","Food frequency questionnaire for Japanese athletes - validation with junior high school athletes | PDF",1790757199,23]