Muscle activity pattern dysfunction during sit to stand and stand to sit in the movement system impairment subgroups of low back pain

Publication date: Available online 11 October 2018

Source: Archives of Physical Medicine and Rehabilitation

Author(s): Neda orakifar, Mohammad Jafar Shaterzadeh-Yazdi, Reza Salehi, Mohammad Mehravar, Neda Namnik

Abstract

Objective

To investigate impairment in the activity pattern of some muscles involved in sit to stand (STD) and stand to sit (STS) among two low back pain (LBP) subgroups of the Movement System Impairment (MSI) model.

Design

Case-control study

Setting

A university medical center

Participants

Fifteen healthy women and twenty-two women with chronic LBP in two subgroups (fifteen into the lumbar extension rotation (LER) and seven into lumbar flexion rotation (LFR)) voluntarily participated in this study.

Interventions

Participants were asked to perform STD and STS at a preferred speed. Surface electromyography (EMG) were measured bilaterally from the internal oblique (IO), lumbar erector spine (ES), medial hamstring (MH) and lateral hamstring (LH) muscles.

Main Outcome Measures

Changes in mean and maximum amplitude, time to peak amplitude, duration of muscle activity and bilateral asymmetry of these variables.

Results

During STD, bilateral asymmetry in mean amplitude of MH in the LER subgroup (p=0.031) and bilateral asymmetry in duration of LH in the LFR subgroup(p=0.026) were exhibited. Also, in this task reduced time to peak left MH activation were found in the LFR subgroup than two other groups (control; p=0.028 / LER; p=0.004). During STS, increased left ES maximum amplitude were observed in the LFR subgroup than LER subgroup (p=0.029). Also, reduced time to peak right ES (p=0.035) and left LH (p=0.038) activation in the LER subgroup than healthy subjects and reduced time to peak left LH activation in LFR subgroup than healthy subjects (p=0.041) were observed during STS.

Conclusions

The differences between the two LBP subgroups may be a result of impairment in the activity pattern of some muscles during functional activity.

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