PDF(Pubmed)
Abstract：
BACKGROUND: Asymmetry in involuntary trunk motion during voluntary movements of the lower extremities is a risk factor for musculoskeletal injuries and may be related to core stability. Core stability plays a pivotal role in maintaining postural stability during distal segment movements. Because mediolateral head motion partially represents trunk motion during rhythmic movements, controlling it can help ensure symmetric trunk motion. This study aimed to investigate the relationship between core stability and asymmetric trunk motion during rhythmic movements, and to evaluate the effects of feedback music on mediolateral head motion.
METHODS: We developed a system that uses a wireless earbud and a high-resolution inertial measurement unit sensor to measure head angle and provide feedback music. When the head angle exceeds a predefined threshold, the music is muted in the earbud on the side of the head tilt. In our lab-based study, we measured head angles during cycling at 70% of maximum speed using this self-developed system, and compared them between individuals with good (Sahrmann core stability test: 2-5 level) and poor core stability (0-1 level). The amplitude of mediolateral head motion was represented by the difference between the left and right peak angles, and the symmetry in mediolateral head motion was represented by the average of left and right peak angles.
RESULTS: Individuals with poor core stability demonstrated significantly greater amplitude of, and less symmetry in, mediolateral head motion than those with good core stability. Additionally, feedback music significantly reduced the amplitude of mediolateral head motion in both the good- and poor-core-stability groups.
CONCLUSIONS: Our findings indicate that core stability is crucial for maintaining symmetric head motion during rhythmic movements like cycling. Feedback music could serve as an effective tool for promoting symmetry in head motion and thus preventing musculoskeletal injuries.
METHODS: We developed a system that uses a wireless earbud and a high-resolution inertial measurement unit sensor to measure head angle and provide feedback music. When the head angle exceeds a predefined threshold, the music is muted in the earbud on the side of the head tilt. In our lab-based study, we measured head angles during cycling at 70% of maximum speed using this self-developed system, and compared them between individuals with good (Sahrmann core stability test: 2-5 level) and poor core stability (0-1 level). The amplitude of mediolateral head motion was represented by the difference between the left and right peak angles, and the symmetry in mediolateral head motion was represented by the average of left and right peak angles.
RESULTS: Individuals with poor core stability demonstrated significantly greater amplitude of, and less symmetry in, mediolateral head motion than those with good core stability. Additionally, feedback music significantly reduced the amplitude of mediolateral head motion in both the good- and poor-core-stability groups.
CONCLUSIONS: Our findings indicate that core stability is crucial for maintaining symmetric head motion during rhythmic movements like cycling. Feedback music could serve as an effective tool for promoting symmetry in head motion and thus preventing musculoskeletal injuries.
摘要：
背景：下肢自主运动过程中不自主躯干运动的不对称性是肌肉骨骼损伤的危险因素，可能与核心稳定性有关。在远端运动过程中，核心稳定性在保持姿势稳定性方面起着关键作用。因为中外侧头部运动部分代表有节奏运动时的躯干运动，控制它可以帮助确保对称躯干运动。这项研究旨在研究有节奏运动过程中核心稳定性与不对称躯干运动之间的关系。并评估反馈音乐对中侧头部运动的影响。
方法：我们开发了一种系统，该系统使用无线耳塞和高分辨率惯性测量单元传感器来测量头部角度并提供反馈音乐。当头部角度超过预定阈值时，音乐在耳塞的头部倾斜的一侧被静音。在我们的实验室研究中，我们使用这个自主开发的系统以最大速度的70％测量了自行车的头部角度，并在具有良好（Sahrmann核心稳定性测试：2-5级）和较差核心稳定性（0-1级）的个体之间进行比较。头部中外侧运动的幅度由左右峰角之间的差异表示，头部中外侧运动的对称性由左右峰角的平均值表示。
结果：核心稳定性差的个体表现出明显更大的振幅，对称性较低，头部中外侧运动比核心运动稳定性好。此外,反馈音乐显著降低了核心稳定性良好和核心稳定性较差组的中外侧头部运动幅度.
结论：我们的发现表明，核心稳定性对于在有节奏的运动（如循环）过程中保持对称的头部运动至关重要。反馈音乐可以作为促进头部运动对称性的有效工具，从而防止肌肉骨骼损伤。
方法：我们开发了一种系统，该系统使用无线耳塞和高分辨率惯性测量单元传感器来测量头部角度并提供反馈音乐。当头部角度超过预定阈值时，音乐在耳塞的头部倾斜的一侧被静音。在我们的实验室研究中，我们使用这个自主开发的系统以最大速度的70％测量了自行车的头部角度，并在具有良好（Sahrmann核心稳定性测试：2-5级）和较差核心稳定性（0-1级）的个体之间进行比较。头部中外侧运动的幅度由左右峰角之间的差异表示，头部中外侧运动的对称性由左右峰角的平均值表示。
结果：核心稳定性差的个体表现出明显更大的振幅，对称性较低，头部中外侧运动比核心运动稳定性好。此外,反馈音乐显著降低了核心稳定性良好和核心稳定性较差组的中外侧头部运动幅度.
结论：我们的发现表明，核心稳定性对于在有节奏的运动（如循环）过程中保持对称的头部运动至关重要。反馈音乐可以作为促进头部运动对称性的有效工具，从而防止肌肉骨骼损伤。
