Journal of High Performance Sport
Online ISSN : 2434-7302
Print ISSN : 2434-7299
Current issue
Displaying 1-2 of 2 articles from this issue
  • Masahiro Hagiwara, Taisuke Kinugasa, Katsuyoshi Shirai, Shuhei Yamashi ...
    2024 Volume 12 Pages 12-21
    Published: 2024
    Released on J-STAGE: May 23, 2024

    Talent identification and development (TID) becomes an indispensable part of athlete development pathways in high-performance sport. Japanese talented athletes identified by local TID (LTID: the projects led by each prefecture) have been educated through sports science literacy programs to change behavior for enhancing sport performance. It remains unclear whether the effects of behavior change up to 6 months after the literacy programs intervention and the importance of the literacy programs for talented athletes. The purpose of this study was to clarify these issues using a questionnaire survey based on the self-evaluation of 43 talented athletes in the LTID project (aged 14 to 15 years). The results showed that more than 80% of the talented athletes progressed from the “precontemplation” or “contemplation” phase to the “action” phase in the behavior change stages after the literacy program intervention. Six months after the intervention, more than 70% of the talented athletes reached the “maintenance” phase in the behavior change stages. In addition, over 90% of the talented athletes indicated that the literacy programs were important or somewhat important. These results suggested that the intervention of sports science literacy programs had a positive effect on behavior change for talented athletes in LTID and the importance of the literacy programs. However, further studies are needed with more comprehensive perspectives that may include other objective measures of behavior change and its association with long-term improvement in sport performance.

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  • Hirotaka Nakashima, Shinsuke Yoshioka, Masahiro Harada, Noriko Hakamad ...
    2024 Volume 12 Pages 1-11
    Published: 2024
    Released on J-STAGE: May 24, 2024

    Ski deflection plays a vital role in determining the quality of the carving turn and overall skiing performance. Therefore, it is essential to quantify the ski deflection accurately. Prior research has utilized strain gauges to investigate ski deflection, but this method posed challenges, including difficulties in measuring the multiple points of the ski. To address these limitations, we focused on utilizing Fiber Bragg Grating (FBG), a technology that can effectively resolve these issues, and developed new techniques to investigate ski deflection. Furthermore, we employed this method to quantify the ski deflection during the carving turn for sit-skier, identifying their areas of improvement to enhance the skiing performance. This paper presents the verification tests of ski deflection using FBG, as well as the technical issues encountered by sit-skiers. Firstly, we conducted a laboratory test to confirm if the FBG strain sensor could detect ski deflection when weights were suspended. Secondly, we conducted an on-snow test to determine if the FBG strain sensor could detect the ski deflection during a straight downhill ski run, with forward and backward loads. The results of these verification tests validated FBG's ability to measure ski deflection. Subsequently, we compared the ski deflection of a sit-skier with that of a standing skier during a carving turn. We found that the sit-skier had difficulty deflecting the forebody of the ski, which limited the range of carving turn techniques sit-skier could perform compared with the standing skier. For instance, fine adjustments in turn radius during carving turns are restricted. In summary, our study demonstrates the potential of FBG to measure ski deflection at multiple points accurately, providing detailed insights for skiers, unlike the strain gauge. Thus, we anticipate that FBG will become a common technique for measuring ski deflection in the future.

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