著者

緒方 博紀 飯塚 太郎 安藤 良介 山下 大地 尾崎 宏樹

出版者

独立行政法人 日本スポーツ振興センター国立スポーツ科学センター

雑誌

Journal of High Performance Sport (ISSN:24347299)

巻号頁・発行日

vol.11, pp.38-51, 2023 (Released:2023-08-08)

参考文献数

38

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In this case report, we examined the performance changes during tapering in two badminton athletes (one male and one female) who advanced to the finals at the World Championships (WC). Furthermore, the significance of a resistance priming session implemented during tapering was discussed. Both athletes participated in a pre-competition training camp in Japan before the WC. A resistance priming session was scheduled one and two days before the WC for the male and female athletes, respectively. Non-countermovement jump (NCMJ) and countermovement jump (CMJ) were measured using a linear position transducer to monitor performance responses from the camp to the WC final. The baseline of the jump performance was given from 15 days (male) and 151 days (female) prior to the WC final. In the male athlete, the mean power of NCMJ decreased 7 days before the finals. This result may be attributed to accumulated fatigue caused by high volume training in the training camp and the short taper period as well as long travel to the host city. In the female athlete, the mean velocity and power of CMJ were the same as baseline before the semi-final. That is, the quarter-final match, where she competed for 85 minutes-the longest game time among the previous matches, may have affected her fatigue. Regardless of these findings, both athletes showed higher jump performance than at baseline just before the final because the matches likely played a role in tapering. In addition, both athletes recorded their personal best jump height just before the final. These findings may indicate that jump performance can be an indicator of tapering and peaking. The findings of this report also demonstrate that athletes may maintain resistance training adaptations by taking advantage of resistance priming for peaking and tapering.

著者

飯塚 太郎 平野 加奈子 烏賀陽 真未子

出版者

独立行政法人 日本スポーツ振興センター国立スポーツ科学センター

雑誌

Sports Science in Elite Athlete Support (ISSN:24322091)

巻号頁・発行日

vol.2, pp.21-29, 2017 (Released:2019-02-15)

参考文献数

12

被引用文献数

1

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In 2006, the Badminton World Federation (BWF) changed the scoring system in badminton to a 21 points × 3 games rally-point scoring system, intending to shorten the duration of matches. However, as the match duration in recent international tournaments is once again increasing, BWF is considering making further changes to the scoring system. In this paper, we examine the changes in match duration in international tournaments since the new scoring system was implemented in 2006. This analysis was performed by comparing the duration of matches from twelve Superseries tournaments during the 2008 Beijing Olympic Games qualification period and the 2016 Rio de Janeiro Olympic Games qualification period. As a result, it was found that the durations of the matches for the Superseries tournaments during the latter period had significantly increased from the former period. A further analysis was conducted to compare match characteristics between the Japan Open Superseries in 2007 and 2015, held during the Beijing and Rio de Janeiro Olympic Games qualification periods, respectively. It was shown that rally time in men’s and women’s singles events and rest time in all events were significantly longer in Japan Open 2015 as compared to 2007. Therefore, it is suggested that the increase in rest time as well as rally time were associated with longer duration of matches in Superseries tournaments during the Rio de Janeiro Olympic Games qualification period.

著者

平野 加奈子 飯塚 太郎 烏賀陽 真未子

出版者

独立行政法人 日本スポーツ振興センター国立スポーツ科学センター

雑誌

Sports Science in Elite Athlete Support (ISSN:24322091)

巻号頁・発行日

vol.2, pp.1-9, 2017 (Released:2019-02-15)

参考文献数

4

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This paper describes the support using match videos that was provided for the Japanese national badminton team in preparation for the 2016 Rio de Janeiro Olympic Games. In order to help coaches and players effectively strategize for their matches, we provided them with match videos and match analysis data. The purpose of the match analysis was categorized as follows: (1) to define the play tendencies of opponents, and (2) to evaluate the performances of Japanese players for further training. Additionally, match videos were provided to the coaches and players through video streaming technology so that they could easily access them anytime. We suggest that these support assisted the coaches and players in preparing for their matches, especially in the decision-making process of formulating strategies.

著者

飯塚 太郎 Yonghao Yue 土橋 宣典 西田 友是

出版者

一般社団法人情報処理学会

雑誌

情報処理学会研究報告. [オーディオビジュアル複合情報処理] (ISSN:09196072)

巻号頁・発行日

vol.63, pp.99-104, 2008-12-04

参考文献数

8

被引用文献数

2

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心理学的知見から、音と映像とのリズムを時間的に同期させると、人間は心地よいと感じると言われており、その同期作業はコンテンツ作成においても頻繁に行われている。本研究では、従来手作業で行っていた同期作業をコンピューターを用いて支援するシステムの構築を目指す。音や映像において急激な変化のある箇所を特徴として検出し、映像の再生速度を調整して音と映像の特徴を同期させる。特徴検出では、まず、音楽や映像の局所的な平均変化率をその区間における信号の分散により測り、特徴検出のための閾値をもとめる。次に閾値を超えた信号を特徴として検出し、その超過度をその特徴の重みとする。音と映像との同期作業では、まず、それぞれの特徴の時間的なずれと、特徴の重みを考慮して、より時間的に接近し、かつ重みの大きいもの同士をマッチングさせる。次に、マッチングされた特徴の各ペアについて、音と映像の特徴が現れる時間の差が、人間が違和感を感じない許容限界よりも小さくなるように、動画の再生速度を調節する。