期刊
SPORTS BIOMECHANICS
卷 -, 期 -, 页码 -出版社
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
DOI: 10.1080/14763141.2021.1995475
关键词
Performance; motion analysis; kinematics; swimming
资金
- JSPS KAKENHI [26750301]
- Grants-in-Aid for Scientific Research [26750301] Funding Source: KAKEN
This study investigated the relationship between 3D lower-limb kinematics and forward-swimming velocity during undulatory underwater swimming (UUS) at maximal velocity. The results showed that peak angular velocities of hip internal and external rotation were significantly correlated with forward-swimming velocity, with hip internal rotation occurring at the middle of down-kicking and peak external rotation occurring at the terminal of down-kicking. Swimmers exhibited higher peak angular velocity of hip internal/external rotation with a large active range of motion for hip rotation, suggesting that three-dimensional lower-limb joint movements, particularly hip rotation, may enhance UUS proficiency.
The three-dimensional (3D) motion of lower-limb joints is evaluated during various sports. However, few studies have reported the 3D lower-limb joint movement during undulatory underwater swimming (UUS). This study aimed to investigate the relationship between 3D lower-limb kinematics and forward-swimming velocity during UUS at maximal velocity. A total of 26 male international- and national-level swimmers were assessed during UUS using a motion-capture system. The 3D angle and angular velocity of the lower-limb joints were calculated and relationships between forward-swimming velocity, angle, and angular velocity were investigated using correlation analysis. The peak angular velocities of hip internal and external rotation were significantly correlated with forward-swimming velocity (r = .48, p = .01 and r = -.74, p < .01, respectively). Peak hip internal rotation was observed at the middle of down-kicking (25% kick cycle, 243 degrees/s), whereas peak external rotation was observed at the terminal of down-kicking (50% kick cycle, -351 degrees/s). The swimmers showed a higher peak angular velocity of hip internal/external rotation with a large active range of motion for hip rotation. The swimmers moved their lower-limb joints three-dimensionally, and aside from flexion/extension movements, and hip rotation may increase UUS proficiency.
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