Research Center in Back, Neck, Other Joint Pain and Human Performance (BNOJPH), Khon Kaen University , Khon Kaen , Thailand.
School of Physical Therapy, Faculty of Associated Medical Sciences, Khon Kaen University , Khon Kaen , Thailand.
Ergonomics. 2019 Dec;62(12):1524-1533. doi: 10.1080/00140139.2019.1661525. Epub 2019 Sep 9.
This study examined the differences in neck muscle activity at various neck flexion angles in smartphone users with and without neck pain. Forty-four participants performed texting tasks for 1 min and 30 s. Neck muscle activity and pain in the neck were measured at different neck flexion angles. There was a difference in neck muscle activity for each of the neck flexion angles; the Cervical Erector Spinae (CES) muscle activity increased while the Upper Trapezius (UT) muscle activity decreased when at increased neck flexion angles. At neck flexion angle of 0°-15°, the activity of both CES and UT muscles were acceptably low. Smartphone users with neck pain had slightly higher muscle activity levels than smartphone users without neck pain. In conclusion, smartphone users should consider adopting neck flexion angles between 0 and 15 degrees during smartphone use as there is an association between this neck flexion angle range and reduced CES muscle activity. This study demonstrated that both smartphone users with and without neck pain should try to keep their neck flexion angle between 0° and 15° when using their smartphone. This would reduce neck muscle activity and the risk of developing neck disorders associated with smartphone use.
本研究旨在探讨有无颈部疼痛的智能手机使用者在不同颈椎前屈角度下颈部肌肉活动的差异。44 名参与者进行了 1 分 30 秒的发短信任务。在不同的颈椎前屈角度下测量了颈部肌肉活动和颈部疼痛。在各个颈椎前屈角度下，颈部肌肉活动存在差异；颈椎伸肌（CES）肌肉活动增加，而颈上部斜方肌（UT）肌肉活动减少。在颈椎前屈角度为 0°-15°时，CES 和 UT 肌肉的活动均处于较低水平。有颈部疼痛的智能手机使用者的肌肉活动水平略高于无颈部疼痛的智能手机使用者。总之，智能手机使用者在使用智能手机时应考虑采用 0 度至 15 度的颈椎前屈角度，因为该颈椎前屈角度范围与 CES 肌肉活动减少有关。本研究表明，有或无颈部疼痛的智能手机使用者在使用智能手机时，应尽量将颈椎前屈角度保持在 0°到 15°之间。这将减少颈部肌肉活动，降低与使用智能手机相关的颈部疾病的风险。
