J Korean Phys Ther.  2018 Apr;30(2):47-53. 10.18857/jkpt.2018.30.2.47.

The Effect of Visual Feedback of Head Angles With Using a Mobile Posture-Aware System on Craniocervical Angle and Neck and Shoulder Muscles Fatigue During Watching the Smartphone

• Kim SJ
• Jeong SY
• Yoon TL

• KMID: 2411320
• DOI: http://doi.org/10.18857/jkpt.2018.30.2.47

Abstract

PURPOSE
To find the effect of visual feedback of head angle with using a mobile posture-aware system on craniocervical angle and neck and shoulder muscles fatigue for preventing or decreasing the forward head posture.
METHODS
Twenty-four healthy young adults in Chungbuk to participate in this study. The subjects started to watch a movie clip for 10 minutes with visual feedback in 0°, 30°, and 60° of head angles. During the task, surface electromyography (EMG) was used to collect data from the upper trapezius (UT), sternocleidomasetoid muscle (SCM), cervical erecter spinae (CES) during watching the smartphone. Craniocervical angles were measured using a sagittal-view photograph of the subject in a sitting posture. A one-way repeated analysis of variance with a significant level of 0.05 used for statistical analysis.
RESULTS
Craniocervical angle with 0° visual feedback was significantly greater than 30°and 60°. Craniocervical angle with 30° visual feedback was significantly greater than 60°. In addition, MDF of UT muscles in 0° and 30° of visual feedback was significantly greater than 60°.
CONCLUSION
We concluded that 0° visual feedback of head angle with using a mobile posture-aware system would be beneficial to prevent or decrease forward head posture during watching a smartphone. We also could recommend using of 30° visual feedback in case of caring UT muscle fatigue primarily.

Keyword

Electromyography; Forward head posture; Head up application; Muscle fatigue

MeSH Terms

Chungcheongbuk-do
Electromyography
Fatigue*
Feedback, Sensory*
Head*
Humans
Muscle Fatigue
Muscles*
Neck*
Posture
Shoulder*
Smartphone*
Superficial Back Muscles
Young Adult