Methods of measuring the tension, contractility, elasticity, extensibility, ductility, resiliency, plasticity, viscosity and hardness of muscle have aimed to give a simple numerical value to tonus which is found to be a complex property of muscle.
It is needless for our purpose to review the large literature on the various methods of measuring the several parts of muscle tonus in animals or in man, nor does it further our end to attempt to correlate our findings with the conclusions reached by other investigators dealing with research of properties other than those we have examined.
We propose to describe some methods of examining a certain property of muscle comparable to viscosity in the cat's muscles at rest, when tetanized and under conditions of various reflex activities, to note the results of these examinations and to compare them with the results of examination of muscles in man suffering from various diseases.
POLLOCK LJ, DAVIS L. RELATION OF MODIFICATIONS OF MUSCLE TONUS TO INTERRUPTION OF CERTAIN ANATOMIC PATHWAYS. Arch NeurPsych. 1932;28(3):586–602. doi:https://doi.org/10.1001/archneurpsyc.1932.02240030106005
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