EFFECT OF IMMOBILIZATION ON THE EXCITATORY AND MECHANICAL PARAMETERS OF SKELETAL MUSCLES WITH DIFFERENT TYPES

1981 ◽  
pp. 185-188
Author(s):  
A. Török ◽  
I. Sziklai ◽  
F. Guba ◽  
Ö. Takács
Keyword(s):  
Skeletal Muscles ◽  
Mechanical Parameters ◽  
Different Types

Elevation of histidine decarboxylase activity in skeletal muscles and stomach in mice by stress and exercise

2000 ◽  
Vol 279 (6) ◽  
pp. R2042-R2047 ◽  
Author(s):  
Kentaro Ayada ◽  
Makoto Watanabe ◽  
Yasuo Endo
Keyword(s):  
Muscle Activity ◽  
Skeletal Muscles ◽  
Histidine Decarboxylase ◽  
Muscle Tension ◽  
The Other ◽  
Decarboxylase Activity ◽  
Gastric Hemorrhage ◽  
Different Types ◽  
Cold Restraint ◽  
Histidine Decarboxylase Activity

The effects of different types of stress (water bathing, cold, restraint, and prolonged walking) on histidine decarboxylase (HDC) activity in masseter, quadriceps femoris, and pectoralis superficial muscles, and in the stomach were examined in mice. All of these stresses elevated gastric HDC activity. Although water bathing, in which muscle activity was slight, was sufficiently stressful to produce gastric hemorrhage and to increase gastric HDC activity, it produced no detectable elevation of HDC activity in any of the muscles examined. The other stresses all elevated HDC activity in all three muscles. We devised two methods of restraint, one accompanied by mastication and the other not. The former elevated HDC activity in the masseter muscle, but the latter did not. These results suggest that 1) HDC activity in the stomach is an index of responses to stress, 2) the elevation of HDC activity in skeletal muscles during stress is induced partly or wholly by muscle activity and/or muscle tension, and 3) stress itself does not always induce an elevation of HDC activity in skeletal muscles.

Detection and Conditioning of EMG

2018 ◽  
pp. 961-1000
Author(s):  
İmran Göker
Keyword(s):  
Electrical Activity ◽  
Clinical Studies ◽  
Skeletal Muscles ◽  
Clinical Importance ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Analog To Digital ◽  
Emg Signal ◽  
Different Types ◽  
Main Components

In this chapter, the monitoring of the electrical activity of skeletal muscles is depicted. The main components of the detection and conditioning of the EMG signals is explained in the sense of the biomedical instrumentation. But, first, a brief description of EMG generation is introduced. The hardware components of the general instrumentation system used in the acquisition of EMG signal such as amplifier, filters, analog-to-digital converter are discussed in detail. Subsequently, different types of electrodes used in different EMG techniques are mentioned. Then, various EMG signals that can be detected and monitored via EMG systems are described and their clinical importance is discussed with detail. Finally, different EMG techniques used in clinical studies and their purposes are explained with detail.

Factors governing mechanical stimulation in frog hearts

1999 ◽  
Vol 277 (6) ◽  
pp. H2311-H2320 ◽  
Author(s):  
Robert W. Fasciano ◽  
Leslie Tung
Keyword(s):  
Mechanical Activation ◽  
Mechanical Stimulation ◽  
Baseline Level ◽  
Rana Catesbeiana ◽  
Electrical Activation ◽  
Mechanical Parameters ◽  
Activation Threshold ◽  
Ventricular Tissue ◽  
Different Types

Because stretch-induced activation may be important in generating clinically relevant arrhythmias in the heart, we delineated the ability of different types of stretches to activate ventricular tissue. Geometrically simple sheets of frog ( Rana catesbeiana) ventricular tissue were mounted to allow stretches to be applied perpendicular to one edge. Every heart could be activated by a stretch pulse ( n = 25), and several parameters were varied to determine their effects on mechanical activation threshold. At shorter coupling intervals, a larger stretch was needed to excite the tissue, and activation-recovery intervals were shorter, similar to previously published electrically probed strength-interval and restitution relations. Additionally, the tissue became easier to activate as the speed of the stretch increased from 0.09 to 2.6% length/ms. The increment in stretch needed for activation decreased as the baseline stretch increased from 0 to 6% length. Thus we show that mechanical activation is similar to electrical activation and that increasing uniquely mechanical parameters such as the speed of the applied stretch or baseline level of stretch can decrease the mechanical activation threshold.

scholarly journals Mechanical parameters of the molecular motor myosin II determined in permeabilised fibres from slow and fast skeletal muscles of the rabbit

2018 ◽  
Vol 596 (7) ◽  
pp. 1243-1257 ◽  
Author(s):  
Valentina Percario ◽  
Simona Boncompagni ◽  
Feliciano Protasi ◽  
Irene Pertici ◽  
Francesca Pinzauti ◽  
...  
Keyword(s):  
Skeletal Muscles ◽  
Molecular Motor ◽  
Myosin Ii ◽  
Mechanical Parameters

scholarly journals Collagen-Based Materials Modified by Phenolic Acids—A Review

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3641
Author(s):  
Beata Kaczmarek ◽  
Olha Mazur
Keyword(s):  
Antimicrobial Activity ◽  
Hydrogen Bonds ◽  
Phenolic Acids ◽  
Biomedical Applications ◽  
Present Knowledge ◽  
Polymeric Chain ◽  
Mechanical Parameters ◽  
Research Reporting ◽  
Pure Collagen ◽  
Different Types

Collagen-based biomaterials constitute one of the most widely studied types of materials for biomedical applications. Low thermal and mechanical parameters are the main disadvantages of such structures. Moreover, they present low stability in the case of degradation by collagenase. To improve the properties of collagen-based materials, different types of cross-linkers have been researched. In recent years, phenolic acids have been studied as collagen modifiers. Mainly, tannic acid has been tested for collagen modification as it interacts with a polymeric chain by strong hydrogen bonds. When compared to pure collagen, such complexes show both antimicrobial activity and improved physicochemical properties. Less research reporting on other phenolic acids has been published. This review is a summary of the present knowledge about phenolic acids (e.g., tannic, ferulic, gallic, and caffeic acid) application as collagen cross-linkers. The studies concerning collagen-based materials with phenolic acids are summarized and discussed.

scholarly journals ДИЗАЙН-ПРОЕКТУВАННЯ СУЧАСНИХ СУКОНЬ З ОЗДОБЛЕННЯМ З УРАХУВАННЯМ ВЛАСТИВОСТЕЙ ТКАНИН

2020 ◽  
pp. 79-90
Author(s):  
К. Л. Пашкевич ◽  
О. В. Єжова ◽  
Т. Ф. Кротова ◽  
Н. Д. Креденець ◽  
Лю Цзянсінь ◽  
...  
Keyword(s):  
System Approach ◽  
Surface Density ◽  
Morphological Analysis ◽  
Physical And Mechanical Properties ◽  
Mechanical Parameters ◽  
Different Types ◽  
The Creation ◽  
Selection Of

To study the specifics of design-projection of clothes with finishing, considering the properties of fabrics. The system approach, as well as the methods of system-structural and morphological analysis, are used. The current collections of women`s clothes, presented by modern designers, have been analyzed; the current fashion trends in manufacturing and finishing of dress fabrics and products, made from such fabrics, have been identified; the classification of types of finishing of clothes has been presented. The frequency of occurrence of different types of finishing in the collections of world-famous designers in 2011 – 2019 has been determined. Physical and mechanical properties of samples of dress fabrics have been studied, in particular: thickness, surface density, abruption characteristics; their interconnections have been identified. The recommendations on the selection of fabrics for the creation of modern women`s dresses using different types of finishing (flat, volumetric) have been developed. The interconnections between physical and mechanical parameters of dress fabrics are identified, and the recommendations on the selection of fabrics for the creation of modern women`s dresses using the finishing based on the tectonic approach are developed. The conducted set of scientific researches on the design-projection of women`s dresses, based on the tectonic approach, and the determination of physical and mechanical parameters of dress fabrics are the basis for the development of recommendations on the selection of fabrics for the manufacturing of dresses with a variety of finishes.

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