Department of Medical Rehabilitation, University of Nigeria, Enugu Campus, Enugu State, Nigeria.
Department of Community Medicine, Enugu State University of Science and Technology, Enugu State, Nigeria.
J Back Musculoskelet Rehabil. 2021;34(6):1015-1021. doi: 10.3233/BMR-200018.
High prevalence of breastfeeding (BF)-related musculoskeletal disorders (MSDs) in nursing mothers have been reported in previous studies. Studies are scarce on the biomechanical effects of the commonly utilized BF positions.
This study evaluated the electromyographic (EMG) activities of the trunk muscles in response to three BF positions commonly utilized by mothers globally.
20 non-pregnant nulliparous females participated in this experimental study. EMG activities from erector spinae (ES) and external oblique (EO) muscles were recorded bilaterally in three BF conditions: cradle (C1); cross-cradle (C2); football (FB). Data were analyzed using descriptive statistics and inferential statistics of one-way analysis of variance with alpha level set at 0.05.
The activity levels of right EO and ES muscles significantly increased during the C2 hold, while the left EO and ES muscles revealed significantly higher EMG levels in the C1 trial. Asymmetrical activity between the right and the left parts of the EO muscle was significantly higher during the C2 hold.
These findings suggest that compared to C2 and C1 holds, FB hold may be more biomechanically efficient relative to its decreased muscular demands. The physical stresses associated with BF may be higher with the adoption of C2 and C1 holds, especially for prolonged periods.
之前的研究报告称，母乳喂养（BF）相关的肌肉骨骼疾病（MSD）在哺乳期母亲中很常见。关于常用 BF 姿势的生物力学影响的研究很少。
本研究评估了三种全球母亲常用 BF 姿势下的躯干肌肉的肌电图（EMG）活动。
20 名未怀孕的初产妇参加了这项实验研究。在三种 BF 条件下（摇篮式（C1）；交叉摇篮式（C2）；橄榄球式（FB）），双侧记录竖脊肌（ES）和外斜肌（EO）的 EMG 活动。使用描述性统计和单因素方差分析的推断统计方法进行数据分析，alpha 水平设置为 0.05。
在 C2 抱姿中，右侧 EO 和 ES 肌肉的活动水平显著增加，而在 C1 试验中，左侧 EO 和 ES 肌肉的 EMG 水平显著升高。在 C2 抱姿中，EO 肌肉右侧和左侧之间的不对称性活动显著更高。
与 C2 和 C1 抱姿相比，与 FB 抱姿相比，其肌肉需求减少，可能更具生物力学效率。采用 C2 和 C1 抱姿时，与 BF 相关的身体压力可能更高，尤其是在长时间内。
