Myography

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Myography

 

the recording of muscular contractions.

The simplest method of graphically recording muscular contractions is by mechanical means—by using a lever whose free end traces the corresponding curve (myogram) on the tape of a kymograph. In addition to such mechanical instruments, optical devices that record muscular contractions on photosensitive film or paper are also used. Myographs of different designs make it possible to record isotonic or isometric contractions. The best method is one that measures oscillations in muscular tension by means of sensors that transform mechanical changes into electrical changes that are recorded on an oscillograph. This method is also used to trace contractions of individual muscle cells. Myography, in conjunction with other physiological techniques, has made it possible to study the main patterns of muscle contractility.

References in periodicals archive ?
Maximal effects and logEC50s [means [+ or -] standard deviation (SD)] from myograph analyses of endothelial function following 4 mo of filtered air (FA) or concentrated ambient particulate matter [(PM).sub.2.5] (CAP) exposure in male [Nestin-creIKK2.sup.flox/+] (control) and [Nestin-creIKK2.sup.flox/flox] ([IKK2.sup.Neu-KO]) mice at 8-12 weeks of age (n = 6-7/group).
Muscle endurance was measured as fatigue resistance using the same myograph and set up as for the measurement of strength.
Mechanical activity was recorded isometrically using a wire myograph (DMT, Aarhus, Denmark).
The isolated esophagus was cut transversally to produce ring-like segments (approximately 2-mm length) that were mounted horizontally onto a wire myograph (610M-DMT; DMT, Aarhus, Denmark).
Abdominal aortic rings were mounted in myograph chambers, where they were maintained in Krebs' solution at 37[degrees]C, continuously supplied with carbogen (95% C[O.sub.2], 5%[O.sub.2]).
The uterus was removed, uterine arcuate arteries dissected free from surrounding tissue and either mounted on a small vessel wire myograph or frozen in liquid nitrogen until analysis.
Vessel rings were then mounted on a wire myograph (Danish MyoTechnology, Aarhus, Denmark) filled with physiological salt solution (PSS) as described previously [19, 26, 27].
The experiments were performed with a DMT 610M Multi Chamber Myograph connected to an ADlnstruments PowerLab 4/30 signal transducer and to a Grass S48 Electrical field stimulator.
After removal of the surrounding connective tissue, the arteries were cut into 4-6 ring segments of ~1.6mm length for functional assessment of endothelial function in a Multi Myograph System (610M, Danish Myo Technology A/S, Aarhus N, Denmark).
Contract Notice: supply, Installation & Maintenance of Wire and Pressure Myograph Systems.There is a requirement in the University of Glasgow~s BHFGCRC, requires 2 X pressure and 1 X wire myograph systems
Aortic rings of 2-3 mm in width were mounted to organ baths (Myograph 601, Danish Myo Technology, Aarhus, Denmark.
Immediately after scarification, the mouse aortas were extracted, cut into pieces as aortic rings, and mounted in a Wire Myograph System (610M, Danish Myo Technology, Aarhus, Denmark) using two parallel L-shaped metal prongs that connected with a force transducer.