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This study was designed to compare electromyogram (EMG) and acoustic myogram (AMG) recordings of biceps brachii muscles in patients with spastic cerebral palsy (CP). The maximal voluntary contraction (MVC) in the CP group was approximately one half of that of the normal group even after being normalized by the muscle cross-sectional area (CSA) (18.6 - 5.9 kNm/m2 in CP, 37.3 +/- 2.9 kNm/m2 in normal). Both CP and normal groups demonstrated a progressive increase in the root mean squared values per unit muscle CSA in the EMG (RMSEMG/CSA) as well as in the AMG (RMSAMG/CSA) with increasing force up to 50% MVC. The increasing magnitude of the RMSEMG/CSA with force was not significantly different between two subject groups. However, all the levels of force resulted in significantly smaller RMSAMG/CSA in the CP group compared to the normal group. The ratios of RMSAMG to RMSEMG in the CP group (0.75 +/- 0.03 m/s2/mV) were significantly smaller than those in the normal group (1.37 +/- 0.07 m/s2/mV) at force levels above 30% MVC. These results suggest that motor disabilities in CP patients are caused not only by primary neural impairment but also by secondary deterioration in muscular contractile properties, probably resulting from muscle fiber atrophy. This appears to be more selective in fast twitch fibers.
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
June 1997,
Muscle & nerve,
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
March 1970,
The Journal of physiology,
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
February 1990,
Journal of applied physiology (Bethesda, Md. : 1985),
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
August 2004,
European journal of applied physiology,
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
April 2016,
Sensors (Basel, Switzerland),
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
January 2013,
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference,
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
July 2009,
Movement disorders : official journal of the Movement Disorder Society,
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
April 2009,
Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology,
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
January 1996,
Applied human science : journal of physiological anthropology,
K Akataki, and
K Mita, and
K Itoh, and
N Suzuki, and
M Watakabe
October 1972,
Journal of neurology, neurosurgery, and psychiatry,
