Differences in the activity of the shoulder girdle and lower back muscles owing to postural alteration while using a smartphone

Gen Adachi, Tomoki Oshikawa, Hiroshi Akuzawa, Koji Kaneoka

Research output: Contribution to journalArticlepeer-review

Abstract

The purpose of this study was to clarify the influence of different postures on the activity of the shoulder girdle and lower back muscles while using a smartphone. Sixteen healthy male participants maintained two postures while using a smartphone: a good posture in which the tragus and acromion were closer to the vertical line passing through the greater trochanter, and a poor posture in which the tragus and acromion were farther from the vertical line passing through the greater trochanter. The target muscles were the rhomboid major (Rhom), upper trapezius, middle trapezius, lower trapezius (LT), lumbar erector spinae (LES), and lumbar mul-tifidus (LMF). The activities of the Rhom and LT were significantly lower with poor posture than those with good posture. The activities of LES and LMF were significantly higher with poor posture than those with good posture. The results of this study indicated that poor posture was associated with hypoactivity of the shoulder girdle muscles and hyperactivity of the lower back muscles when compared with good posture. Poor posture for prolonged periods while using a smartphone would lead to malfunction of the shoulder girdle muscles and musculofascial lower back pain.

Original languageEnglish
Pages (from-to)274-279
Number of pages6
JournalJournal of Medical Investigation
Volume67
Issue number3.4
DOIs
Publication statusPublished - 2020

Keywords

  • Fine-wire EMG
  • Low back pain
  • Posture
  • Shoulder girdle muscles
  • Smartphone

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Fingerprint Dive into the research topics of 'Differences in the activity of the shoulder girdle and lower back muscles owing to postural alteration while using a smartphone'. Together they form a unique fingerprint.

Cite this