Medical practice of measuring blood pressure at any operation establishes asymmetrical power roles.
The arms are equivalent to our loops, as well as easy immobilize animals taking them by the neck or horns.
Anyone can take another by the arm and lead to anywhere, provided you have more strength than the detainee.
When children are 'managed' by force, are caught in the upper extremity. They almost always are weaker than adults trying to dominate them.
The feeling that someone feels when taken by the arm, is related to the smoothness of the gesture.
We helped when contact is slight and felt "forced" in proportion to the energy with which we captured: A "claw" is violent and despotic while a delicate touch, with an open hand, is loving, affectionate partner.
In another article (1) commented that medicine uses methods including sado-masochistic traits.
Despite what is popularly said, sado-masochism is not vicious perversion accustomed to some very sick people, but refers to the adaptation healthy kids do when they do enjoy being annoyed by adults who are responsible for their care.
The sado-masochism to which I refer is not dependent on special equipment or scenery, but the simple attitude to tolerate and even enjoy participating in a strongly asymmetrical relationship, in which one takes complete control (sadistic position) and the other is Submit (masochism).
When someone requires medical attention, almost immediately be strongly taken by an arm through the use of an inflatable belt to tighten it cut off blood circulation, which the detected using its distinctive professional stethoscope. So are established asymmetrical power roles.
Note: Original in Spanish (without translation by Google): La asimetría de poder médico-paciente.
(This is the Article No. 1765)