人材検索について
ハイパフォーマンススポーツに係る研究者やサポートスタッフ等の人材情報の検索ができます。HPSCに現在勤務する職員（HPSCスタッフ）、HPSCの勤務経験者（HPSC OB/OG）、HPSCの各種事業における協力者（HPSC事業協力者）のカテゴリーに分けております。人材データベースへのご登録はHPSCからご依頼させて頂いた方のみとしております。
最終更新日：2026/07/23
山下 大地
ヤマシタ ダイチ
(Daichi Yamashita)
論文
- タイトル
- タイトル（英）
- Differences in trunk rotation angle between bar-holding and crossed-arms positions in a seated position.
- 参照URL
- https://researchmap.jp/daichiyamashita/published_papers/54410968
- 著者
- 著者（英）
- Yuko Ishida,Natsuka Inoue,Shogo Okamoto,Masashi Aoyagi,Frederick James Henderson,Daichi Yamashita
- 担当区分
- 最終著者,責任著者
- 概要
- 概要（英）
- INTRODUCTION: As trunk rotation is essential for sports requiring spinal mobility, accurate assessment is important for identifying functional deficits and evaluating performance. This study compared trunk rotation angles and left-right asymmetry between bar-holding and crossed-arms positions. MATERIALS AND METHODS: Twenty-four athletes performed seated trunk rotation under two conditions: (1) a bar-holding position (bar resting on shoulders), which allows shoulder girdle contribution, and (2) a crossed-arms position, which minimizes it. A ceiling-mounted camera captured overhead images. Markers attached to the acromion and posterior superior iliac spines were used to track trunk and pelvic movement, respectively. Rotation angles were calculated relative to the horizontal reference line. Each angle was measured three times per condition and averaged for analysis. RESULTS: Trunk rotation angles were significantly greater in the bar-holding condition than in the crossed-arms condition (right: 58.0 ± 12.9° vs. 49.2 ± 10.1°; left: 55.9 ± 12.3° vs. 47.5 ± 9.6°; p < 0.01). High positive correlations were found between conditions for both right (r = 0.82, p < 0.01) and left rotation angles (r = 0.65, p < 0.01). Asymmetry patterns were also positively correlated between conditions (r = 0.64, p < 0.01). DISCUSSION: The larger angles in the bar-holding condition confirm that shoulder girdle motion contributes substantially to the measured trunk rotation. However, the consistent asymmetry patterns suggest that either posture is valid for identifying side-to-side imbalances. CONCLUSION: This study highlights that the choice of upper limb position substantially influences the measured range of trunk rotation. Collectively, these findings emphasize that clinicians should select the specific test position based on the evaluation purpose-whether to isolate thoracic motion or to assess coordinated trunk-shoulder movement.
- 出版者・発行元
- 出版者・発行元（英）
- 誌名
- 誌名（英）
- Asia-Pacific journal of sports medicine, arthroscopy, rehabilitation and technology
- 巻
- 45
- 号
- 開始ページ
- 69
- 終了ページ
- 73
- 出版年月
- 2026年7月
- 査読の有無
- 査読有り
- 招待の有無
- 掲載種別
- 研究論文（学術雑誌）
- ISSN
- DOI URL
- https://doi.org/10.1016/j.asmart.2026.05.010
- 共同研究・競争的資金等の研究課題