| Effect of load on surface electromyogram signals from the upper limb muscles of Parkinson's patients |
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| DOI： |
| EN KeyWords: Parkinson's disease the upper limb surface electromyogram signals load |
| Fund Project:广东省佛山市科技发展专项资金资助项目（佛科［2011］103号201108193） |
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| EN Abstract: |
| Objective: To observe changes and characteristics of the surface electromyogram (sEMG) signals of the upper limb muscles in Parkinson's disease (PD) patients without or with load. Methods:Twenty-six PD patients (PD group) and 28 healthy individuals (control group) were enrolled in this study. All the subjects were subjected to isometric contraction for elbow flexion with no load or 1.5 kg load. The surface myoelectric signals of biceps brachii and wrist flexion muscles were collected and processed by linear time and frequency-domain method. Results:The median frequency (MF) and mean power frequency (MPF) in PD group were higher than in control group (P<0.01). The value of average electromyography (AEMG) in PD group was obviously lower than in control group (P<0.01). The values of MF and MPF of biceps brachii in the PD group were lower than those of wrist flexion muscles (P<0.05, or P<0.01). The MF and MPF in PD group with no load were higher than those in PD group with load (P<0.05, or P<0.01), and the value of AEMG in the presence of load was lower than that in the absence of load (P<0.01). In the absence of load, MF and MPF of biceps brachii were lower than those of wrist flexion muscles (P<0.05, or P<0.01). Conclusions: The motor units of the upper limb muscles in PD patients are over collected and the strength is reduced, especially in the forearm muscles or upper limb muscles in the absence of load. The sEMG signals can reflect the function of the muscles of patients with PD. |
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