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, 27 (7), 2183-7

Perceived Body Discomfort and Trunk Muscle Activity in Three Prolonged Sitting Postures

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Perceived Body Discomfort and Trunk Muscle Activity in Three Prolonged Sitting Postures

Pooriput Waongenngarm et al. J Phys Ther Sci.

Abstract

[Purpose] This study aimed to investigate the perceived discomfort and trunk muscle activity in three different 1-hour sitting postures. [Subjects] A repeated-measures design study was conducted on 10 healthy subjects. [Methods] Each subject sat for an hour in three sitting postures (i.e., upright, slumped, and forward leaning sitting postures). Subjects rated perceived body discomfort using Borg's CR-10 scale at the beginning and after 1 hour sitting. The electromyographic activity of the trunk muscle activity was recorded during the 1-hour period of sitting. [Results] The forward leaning sitting posture led to higher Borg scores in the low back than those in the upright (p = 0.002) and slumped sitting postures (p < 0.001). The forward leaning posture was significantly associated with increased iliocostalis lumborum pars thoracis (ICL) and superficial lumbar multifidus (MF) muscle activity compared with the upright and slumped sitting postures. The upright sitting posture was significantly associated with increased internal oblique (IO)/transversus abdominis (TrA) and ICL muscle activity compared with the slumped sitting posture. [Conclusion] The sitting posture with the highest low back discomfort after prolonged sitting was the forward leaning posture. Sitting in an upright posture is recommended because it increases IO/TrA muscle activation and induces only relatively moderate ICL and MF muscle activation.

Keywords: Electromyography; Pain; Sitting posture.

Figures

Fig. 1.
Fig. 1.
(A) Slump sitting, (B) Upright sitting, (C) Forward leaning sitting

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References

    1. Manchikanti L: Epidemiology of low back pain. Pain Physician, 2000, 3: 167–192. - PubMed
    1. Barrero LH, Hsu YH, Terwedow H, et al. : Prevalence and physical determinants of low back pain in a rural Chinese population. Spine, 2006, 31: 2728–2734. - PubMed
    1. Ihlebaek C, Hansson TH, Laerum E, et al. : Prevalence of low back pain and sickness absence: a “borderline” study in Norway and Sweden. Scand J Public Health, 2006, 34: 555–558. - PubMed
    1. Henschke N, Maher CG, Refshauge KM, et al. : Prognosis in patients with recent onset low back pain in Australian primary care: inception cohort study. BMJ, 2008, 337: a171. - PMC - PubMed
    1. Costa LC, Maher CG, McAuley JH, et al. : Prognosis for patients with chronic low back pain: inception cohort study. BMJ, 2009, 339: b3829. - PMC - PubMed
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