背景:由于技术的快速发展,智能手机的使用在过去十年中迅速增加。这种智能手机的广泛使用导致生理问题和肌肉骨骼疾病(MSD)由于不适当的姿势。
目的:过去的研究报道了短期使用智能手机的影响/不适,范围从3-20分钟,这并不代表当前智能手机依赖的时代(大约7小时/天)。
方法:这项研究是对54名年龄在20-28岁之间的参与者进行的,他们以坐姿发短信1小时。屈曲角度,胸锁乳突肌(SCM)两侧(显性和非显性)肌肉活动(最大自愿收缩%),上斜方肌(TRP),指伸肌(EDM)和短肌外展肌(APB),并对主观不适进行分析。
结果:智能手机发短信1小时后,八个上肢的肌肉活动:SCM(24.80%),TRP(29.45%),EDM(14.44%)和APB(19.87%)显着(p<0.001)以27.4±3.18°和82.94±7.03°头部和下臂屈曲角度增加了1.5-1.9倍,分别。颈椎上的机械载荷增加了4.6倍,和主观不适的3倍。
结论:长时间保持相同的姿势会导致姿势压力,肌肉失衡,和不适,导致颈椎间盘压力增加的MSD。
UNASSIGNED: Smartphone usage has increased rapidly in the last decade due to rapid technological advancements. This extensive usage of smartphones led to physiological problems and musculoskeletal disorders (MSD) due to inappropriate postures.
UNASSIGNED: Past studies have reported the effects/discomfort of smartphone usage for short periods, ranging from 3-20 min, which does not represent the current era of smartphone dependency (approximately 7-hr/day).
UNASSIGNED: This study was performed on fifty-four participants aged 20-28 with 1-hr smartphone texting in a sitting posture. Flexion angles, both sides (dominant and non-dominant) muscle activity (maximum voluntary contraction %) at sternocleidomastoid (SCM), upper-trapezius (TRP), extensor digitorum (EDM) and abductor pollicis brevis (APB) muscles, and subjective discomfort were analyzed.
UNASSIGNED: After 1-hr smartphone texting, the muscle activity at eight upper extremities: SCM (24.80%), TRP (29.45%), EDM (14.44%) and APB (19.87%) significantly (p < 0.001) increased by 1.5-1.9 times with 27.4±3.18° and 82.94±7.03° head and lower-arm flexion angles, respectively. The mechanical loads on the cervical spine increased by 4.6 times, and subjective discomfort by 3 times.
UNASSIGNED: Maintaining the same posture for a long duration causes postural stress, muscular imbalances, and discomfort, leading to MSD with increased cervical intervertebral disc pressure.