Speed Of Contraction
Mostrando 13-24 de 65 artigos, teses e dissertações.
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13. Vibração das pregas vocais pré e pós aproximação cricotireóidea: estudo experimental em laringes humanas por videoquimografia. / Vibratory pattern of the vocal folds pre and post cricothyroid approximation: experimental study in human larynges by videokymography.
The cricothyroid approximation simulates the cricothyroid muscle contraction by approximating the cricoid and thyroid cartilages. By this surgery, the vocal folds are lengthened. Consequently, the fundamental frequency of the voice is increased. The main indications for this procedure are patients presenting voice hoarseness due to superior laryngeal nerve
Publicado em: 2002
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14. Duração do ato e do ciclo mastigatorio em individuos com disfunção craniomandibular
The purpose of this study was to assess the eletromyographic parameters of the masticatory act duration, in the muscles temporal anterior and masseter of the 46 subjects with craniomandibular disorders (CMD), corresponding to the period of time between the start and the final of muscle contration; the duration of the masticatory cycle, or the period between
Publicado em: 1996
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15. Effect of speed of muscle contraction on physiological tremor in normal subjects and in patients with thyrotoxicosis and myxoedema1
The speed of the ankle jerk and physiological finger tremor in patients with thyrotoxicosis and myxoedema have been compared with those in age-matched control subjects. Tremor amplitude depends on the speed of muscle contraction; the faster muscle contracts the greater is the amplitude of tremor, and vice versa. The frequency of the dominant tremor peak is n
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16. Trading force for speed: Why superfast crossbridge kinetics leads to superlow forces
Superfast muscles power high-frequency motions such as sound production and visual tracking. As a class, these muscles also generate low forces. Using the toadfish swimbladder muscle, the fastest known vertebrate muscle, we examined the crossbridge kinetic rates responsible for high contraction rates and how these might affect force generation. Swimbladder f
The National Academy of Sciences.
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17. Dynamic analysis of larval locomotion in Drosophila chordotonal organ mutants
Rhythmic movements, such as peristaltic contraction, are initiated by output from central pattern generator (CPG) networks in the CNS. These oscillatory networks elicit locomotion in the absence of external sensory or descending inputs, but CPG circuits produce more directed and behaviorally relevant movement via peripheral nervous system (PNS) input. Drosop
National Academy of Sciences.
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18. Kinetics of thin filament activation probed by fluorescence of N-((2-(Iodoacetoxy)ethyl)-N-methyl)amino-7-nitrobenz-2-oxa-1, 3-diazole-labeled troponin I incorporated into skinned fibers of rabbit psoas muscle: implications for regulation of muscle contraction
Making use of troponin with fluorescently labeled troponin I subunit (N-((2-(iodoacetoxy)ethyl)-N-methyl)amino-7-nitrobenz-2-oxa-1, 3-diazole-troponin I, IANBD-TnI) that had previously been described in solution studies as a probe for thin filament activation (. Proc. Natl. Acad. Sci. 77:7209-7213), we present a new approach that allows the kinetics of thin
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19. CROSS-BRIDGE PROPERTIES DERIVED FROM MUSCLE ISOTONIC VELOCITY TRANSIENTS
The rate constants for the turnover of cross-bridges during frog muscle contraction were determined from an analysis of the motion that follows step decreases in load. For a given projection from the myosin filament, there appears to be a range of about 100 Å along the length of the filament over which the projection can attach to the actin filament and for
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20. Effects of age on calcium transport activity of sarcoplasmic reticulum in fast- and slow-twitch rat muscle fibres.
1. The calcium transport activity of the sarcoplasmic reticulum (SR) was measured in chemically skinned single fast- and slow-twitch muscle fibres from young (3 months) and old (23-24 months) rats. Contractile properties, the myosin heavy chain (MHC) composition and enzyme histochemical features were studied in relation to the SR characteristics. 2. In fast-
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21. Intramural mechanism of esophageal peristalsis: roles of cholinergic and noncholinergic nerves.
We examined the role of peripheral cholinergic and noncholinergic mechanisms in esophageal peristalsis. Intramural nerve elements in rings of circular muscle from six different levels of the opossum esophagus were stimulated transmurally so as to cause neurally mediated muscle contractions. Stimulus frequency was varied from 2 to 40 Hz. An increase in stimul
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22. Intrasarcomere [Ca2+] gradients in ventricular myocytes revealed by high speed digital imaging microscopy.
Cardiac muscle contraction is triggered by a small and brief Ca2+ entry across the t-tubular membranes, which is believed to be locally amplified by release of Ca2+ from the adjacent junctional sarcoplasmic reticulum (SR). As Ca2+ diffusion is thought to be markedly attenuated in cells, it has been predicted that significant intrasarcomeric [Ca2+] gradients
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23. Influence of bolus temperature on human esophageal motor function
Hot and cold water, in comparison to room temperature water, ingested by normal young men, profoundly alters esophageal motor function. Cold water slows or abolishes esophageal peristalsis, prolongs the contraction wave in the distal esophagus, produces a delayed but prolonged relaxation of the lower esophageal sphincter, and regularly causes a lower esophag
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24. Kinetic equilibrium of forces and molecular events in muscle contraction
In biomolecular systems, the mechanical transfer of free energy occurs with both high efficiency and high speed. It is shown here that such a transfer can be achieved only if the participating free-energy-storing elements exhibit opposing relationships between their content of free energy and the force they exert in the transfer direction. A kinetic equilibr
The National Academy of Sciences.