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On analysis of surface electromyography signal from resting lumbar myofascial tissue

Ankylosing spondylitis (AS) often develops in early adulthood with progressive reduced spine mobility. Myofascial stiffness or tone is the stiffness of resting muscle and its alterations may be associated with low back disorders. In our research, the passive resting stiffness of lower lumbar extensor myofascia in young subjects has been quantified concurrently with surface electromyography (sEMG). Our hypothesis is that greater lumbar myofascial stiffness in AS vs normal subjects is an intrinsic myofascial property and analyses of sEMG will help in determining its potential relations to variations in resting muscle tone. The focus of this study is to use a differential amplifier to amplify the sEMG signal and use Myoscan sensor to collect data, then apply signal processing algorithms for time-frequency analysis. Such quantitative studies may help identify AS disease in the earliest stage and enhance the clinical evaluation of this disease.