News
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：2025/04/07
中村 隼人
ナカムラ ハヤト
(Hayato Nakamura)
論文
- タイトル
- タイトル（英）
- Hamstring Activity Before and After Break-Point Angle Calculated By Smartphone Application During the Nordic Hamstring Exercise.
- 参照URL
- https://researchmap.jp/nakhay42/published_papers/49668919
- 著者
- 著者（英）
- Toshiaki Soga,Shota Yamaguchi,Takayuki Inami,Hiromi Saito,Nadaka Hakariya,Naoto Nakaichi,Sho Shinohara,Koki Sasabe,Hayato Nakamura,Teerapat Laddawong,Kei Akiyama,Norikazu Hirose
- 担当区分
- 概要
- 概要（英）
- INTRODUCTION: Previous studies have reported a gradual decrease in biceps femoris (BF) electromyography (EMG) activity after the break-point angle (BPA) during the Nordic hamstring exercise (NHE). However, no investigation has been conducted on BF EMG activity before and after BPA as calculated using a smartphone application (Nordic Angle app). HYPOTHESIS/PURPOSE: The aim of this study was to investigate the BF EMG activity before and after BPA, as calculated using the Nordic Angle app. The hypotheses were that BF EMG activity would peak near the BPA and gradually diminish afterward. METHODS: After a warm-up, participants performed three repetitions of prone leg curls to discern maximum voluntary isometric contraction (MVIC) of the hamstrings. The peak value of the BF EMG activity during the prone leg curl was used to convert BF EMG activity during NHE to %MVIC. BPA during NHE was calculated using the Nordic Angle app by analyzing a movie recorded with an iPhone camera. Additionally, the knee flexion angle during NHE was determined using two-dimensional motion analysis software based on video data. To compare EMG activity before and after BPA calculated by the Nordic Angle app, the knee flexion angle was divided into seven phases: 10-15° before BPA, 5-10° before BPA, BPA ± 5°, 5-10° after BPA, 10-15° after BPA, 15-20° after BPA, and 20-25° after BPA. RESULTS: There was no significant difference between the BPA of the Nordic angle and the knee flexion angle at peak BF EMG activity (d = 0.13, p = 0.678). The BF EMG activity at 20-25° after BPA was significantly lower than the BF EMG activity at BPA ± 5° (d = 0.87, p = 0.011). CONCLUSIONS: To prevent the recurrence of hamstring injuries, it is important to incorporate knee flexion exercises that enhance BF EMG activity at 15-35° of knee flexion (0° indicates a fully extended knee). Thus, it is recommended to keep the BPA of the Nordic Angle within 35° to effectively prevent recurrent hamstring injuries during NHE. LEVEL OF EVIDENCE: 3b.
- 出版者・発行元
- 出版者・発行元（英）
- 誌名
- 誌名（英）
- International journal of sports physical therapy
- 巻
- 18
- 号
- 6
- 開始ページ
- 1290
- 終了ページ
- 1298
- 出版年月
- 2023年
- 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/10.26603/001c.89271
- 共同研究・競争的資金等の研究課題