Hand-book_of_physiology_(1892)_(14578682169)

A myograph is any device used to measure the force produced by a muscle when under contraction. Such a device is commonly used in myography, the study of the velocity and intensity of

muscular contraction Muscle contraction is the activation of tension-generating sites within muscle cells. In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as ...

. A myograph can take several forms: for tubular structures such as

blood vessels The blood vessels are the components of the circulatory system that transport blood throughout the human body. These vessels transport blood cells, nutrients, and oxygen to the tissues of the body. They also take waste and carbon dioxide away f ...

these include the pressure myograph (where a segment of a blood vessel is cannulated at either or both ends) and the wire myograph (where the blood vessel segment is threaded onto a pair of pins or wires); for skeletal muscle other devices such as the

acceleromyograph An acceleromyograph is a piezoelectric myograph, used to measure the force produced by a muscle after it has undergone nerve stimulation. Acceleromyographs may be used, during anaesthesia when muscle relaxants are administered, to measure the d ...

can be used. In

pharmacology Pharmacology is a branch of medicine, biology and pharmaceutical sciences concerned with drug or medication action, where a drug may be defined as any artificial, natural, or endogenous (from within the body) molecule which exerts a biochemica ...

, myographs are used to record muscle contraction in

organ bath An organ chamber, organ bath, or isolated tissue bath is a chamber in which isolated organs or tissues can be administered with drugs, or stimulated electrically, in order to measure their function. The tissue in the organ bath is typically oxyg ...

preparations. The related technique of

electromyography Electromyography (EMG) is a technique for evaluating and recording the electrical activity produced by skeletal muscles. EMG is performed using an instrument called an electromyograph to produce a record called an electromyogram. An electromyog ...

is used to measure electrical activity of the muscle instead of force.

References

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External links

Information on microvessel studies
(wire myograph)
Various types of blood vessel myographs

Blood vessel myographs
Exercise physiology