Trunk muscle activity during pressure feedback monitoring among individuals with and without chronic low Back pain
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RESEARCH ARTICLE
Open Access
Trunk muscle activity during pressure feedback monitoring among individuals with and without chronic low Back pain Xin Li1†, Wai Leung Ambrose Lo1†, Song-wei Lu1, Howe Liu2, Ke-yu Lin1, Jian-yang Lai1, Le Li1* and Chu-huai Wang1*
Abstract Background: Pressure biofeedback unit (PBU) is a widely used non-invasive device to assist core muscle training by providing pressure feedback. The aim this study was to compare the muscle activities of transverse abdominis (TA) and multifidus (MF) at different target pressures (50, 60 and 70 mmHg) of PBU between individuals with and without cLBP. Methods: Twenty-two patients with chronic LBP (cLBP) and 24 age matched healthy individuals were recruited. Electromyography (EMG) signals were recorded from the TA and MF muscles while the TA and MF were contracted to achieve PBU pressure value of 50, 60 and 70 mmHg in random order. The average EMG amplitude (AEMG) of 3 replicate trials was used in the analysis after normalization to %MVIC. %MVIC is defined as the mean of the three AEMG divided by the AEMG of MVIC. Two-way ANOVA was performed to assess the effects of groups (healthy and cLBP) and the three different target pressures of PBU. Independent sample t-test was conducted to compare between the two groups. Spearman’s correlation analysis was performed in the cLBP group to determine potential correlations between EMG activity, NPRS and ODI. Results: The %MVIC of the TA and MF in the cLBP group were higher than the control group at each pressure value (P
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