An Investigation of Muscular Function in Patients with Cerebral Palsy by Muscular Sound Characteristics.
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概要
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Contracting muscle fiber is accompanied with a rumbling noise due to lateral expansion of the muscle fiber. It is referred to as muscular sound (MS). The purpose of the present study is to assess muscular function of patients with cerebral palsy (CP) using MS. MS was derived from the belly surface of the biceps brachii muscle by a contact acceleration sensor with a piezo-electric element. Twelve CP patients and 12 normal persons performed an isometric elbow flexion from 10% to 60% of their maximum voluntary contraction (MVC). The recorded MS was processed by the FFT method to determine its power spectral distribution (PSD). After being smoothed with the B-spline function, the PSD was separated into two Gaussian distributions with the simplex method: a relatively lower frequency distribution (D1) and relatively higher frequency distribution (D2). The PSD in both subject groups deviated towards the high frequency range with increase in muscle contraction and demonstrated a trend to bimodal distribution at contractions beyond 30% MVC. The power in patients was, however, significantly smaller than that in normal subjects. The mean frequency and standard deviation of D1 showed a similar change with contraction level in both subject groups. These parameters of D2 increased linearly along with contraction level; however, the increments at contraction levels beyound 30% MVC were extremely lower in CP patients compared with those in normal subjects. These findings suggest that CP patients have a disuse atrophy of muscle and muscular dysfunction may appear selectively in fast twitch muscle fibers.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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