The purpose of this study was to contrast the discharge patterns of the same motor units during movements and during isometric contractions that were produced with comparable torque-time characteristics. Subjects performed elbow flexion and extension movements with predetermined acceleration charact
Motor unit recruitment and discharge behavior in movements and isometric contractions
β Scribed by Andon R. Kossev; Peka Christova
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 33 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0148-639X
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π SIMILAR VOLUMES
against external support. In both cases a permanent increase of the muscle force during the entire contraction is required. We have not found a ''triphasic'' pattern of muscle activation even during very fast movements. The ''triphasic'' pattern was not evident during eccentric movements either (see
Recruitment of single motor units (SMUs) of the masseter muscle was studied using macro representation (MacroRep) as the indicator of motor unit size. When subjects followed a slow isometric force ramp, units were usually recruited in order of MacroRep size. However, pooling the data from repeated r
We studied 60 motor units from abductor pollicis brevis, first dorsal interosseous, and abductor digiti minimus muscles in 18 patients with upper motor neuron lesions. Both fractional process parameters and serial correlation coefficients were estimated. The results suggest that both serial correlat
The purpose of this study was to compare the steadiness and discharge rate of motor units during submaximal contractions performed by young and old adults. Subjects performed isometric and slow shortening and lengthening contractions with the first dorsal interosseous muscle. The steadiness of the i
Surface electromyographic (EMG) studies have been widely used to record muscle activity during human motor control studies. 2 However, during studies of single motor unit (SMU) discharge patterns in a clinical setting, a needle electrode has been the electrode of choice because of difficulty in isol