منابع مشابه
Movement-related phasic muscle activation. I. Relations with temporal profile of movement.
1. The role of phasic muscle activation in determining the temporal properties of human arm movements was studied. The experiments show that subjects can modulate the triphasic electromyographic (EMG) pattern to produce movements of varied temporal structures. 2. Subjects performed horizontal forearm movements in which they varied movement accelerations and decelerations. All movements were of ...
متن کاملMuscle Spindles in Phasic and Tonic Muscle.
Comparisons were made of muscle spindle structure between phasic and tonic muscles stained by the gold chloride method. The most significant difference was in the ring diameter of the sensory nerve terminals wrapped around the nuclear bags. In tibialis anterior it was largest, in gastrocnemius intermediate, and in soleus smallest. This order corresponds to the contraction time, tibialis anterio...
متن کاملAge-related differences in pre-movement antagonist muscle co-activation and reaction-time performance.
Multiple causes contribute to the prolonged reaction-times (RT) observed in elderly persons. The involvement of antagonist muscle co-activation remains unclear. Here the Mm. Biceps and Triceps Brachii activation in 64 apparently healthy elderly (80 ± 6 years) and 60 young (26 ± 3 years) subjects were studied during a simple RT-test (moving a finger using standardized elbow-extension from one pu...
متن کاملActivation of the motor cortex during phasic rapid eye movement sleep
When dreaming during rapid eye movement (REM) sleep, we can perform complex motor behaviors while remaining motionless. How the motor cortex behaves during this state remains unknown. Here, using intracerebral electrodes sampling the human motor cortex in pharmacoresistant epileptic patients, we report a pattern of electroencephalographic activation during REM sleep similar to that observed dur...
متن کاملTiming of muscle activation in a hand movement sequence.
Recent studies have described muscle synergies as overlapping, multimuscle groups defined by synchronous covariation in activation intensity. A different approach regards a synergy as a fixed temporal sequence of bursts of activity across groups of motoneurons. To pursue this latter definition, the present study used a principal component (PC) analysis tailored to reveal the across-muscle tempo...
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ژورنال
عنوان ژورنال: Experimental Brain Research
سال: 1994
ISSN: 0014-4819,1432-1106
DOI: 10.1007/bf00228984