Ahn SH, Jung SH, Kim HA, Kim JH, Weon YS, Kwon OY. Differences in neck muscle activity according to lying positions using a smartphone.
J Back Musculoskelet Rehabil 2022;
35:383-391. [PMID:
34334376 DOI:
10.3233/bmr-200315]
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Abstract
BACKGROUND
Due to the extended use of smartphones, people spend a lot of time on these devices while lying down.
OBJECTIVE
The purpose of the present study was to compare the differences in neck muscle activity of participants while they watched videos on a smartphone in four different lying positions (supine (SUP), prone on elbows (PE), side lying (SIDE), and 45∘ head turn while side lying (45-SIDE)).
METHODS
Twenty-three healthy volunteers (22.4 ± 1.7 years) were enrolled in this study. We assessed the activities of their right and left sternocleidomastoid (SCM), anterior scalene, cervical erector spinae (CES), and upper trapezius (UT) muscles while they watched videos on a smartphone in four different lying positions.
RESULTS
The right and left SCM and CES had significantly different muscle activities depending on the lying positions. The SCM activity had a significantly greater asymmetry in the 45-SIDE position, while the CES activity had a significantly greater asymmetry in the SIDE and 45-SIDE positions. Moreover, the UT activity had a significantly greater asymmetry in the SUP, PE, and SIDE positions.
CONCLUSIONS
Neck muscle activity and asymmetry were the lowest in the SUP position relative to the other positions. Therefore, lying down in the SUP position may minimize neck muscle activation while using a smartphone.
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