Motor unit activity in biceps brachii of left-handed humans during sustained contractions with two load types
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چکیده
منابع مشابه
Motor unit activity in biceps brachii of left-handed humans during sustained contractions with two load types.
The purpose of the study was to compare the discharge characteristics of single motor units during sustained isometric contractions that required either force or position control in left-handed individuals. The target force for the two sustained contractions (24.9 ± 10.5% maximal force) was identical for each biceps brachii motor unit (n = 32) and set at 4.7 ± 2.0% of maximal voluntary contract...
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Twenty subjects participated in four experiments designed to compare time to task failure and motor-unit recruitment threshold during contractions sustained at 15% of maximum as the elbow flexor muscles either supported an inertial load (position task) or exerted an equivalent constant torque against a rigid restraint (force task). Subcutaneous branched bipolar electrodes were used to record si...
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The purpose of the study was to expand a model of motor unit recruitment and rate coding (30) to simulate the adjustments that occur during a fatiguing contraction. The major new components of the model were the introduction of time-varying parameters for motor unit twitch force, recruitment, discharge rate, and discharge variability, and a control algorithm that estimates the net excitation ne...
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As a consequence of a stroke, both motor control as well as motor unit (MU) characteristics may change, e.g. MU size has been reported to increase due to reinnervation [1]. The high selectivity of array surface electromyography enables the non-invasive investigation of motor unit action potentials (MUAPs). The aim of the present study was to investigate how differences between the affected an u...
متن کاملDischarge characteristics of biceps brachii motor units at recruitment when older adults sustained an isometric contraction.
The purpose of this study was to compare the discharge characteristics of motor units recruited during an isometric contraction that was sustained with the elbow flexor muscles by older adults at target forces that were less than the recruitment threshold force of each isolated motor unit. The discharge times of 27 single motor units were recorded from the biceps brachii in 11 old adults (78.8 ...
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ژورنال
عنوان ژورنال: Journal of Neurophysiology
سال: 2016
ISSN: 0022-3077,1522-1598
DOI: 10.1152/jn.00147.2016