Shiatsu is a technique that can help relieve tension in the body and promote relaxation. Tension is a physiological response that manifests itself in the muscles, as they have a certain level of electrical activity even at rest. This activity increases until it reaches its peak during the pre-contractile phase, which is when the muscles prepare for movement. There are two types of contraction: isotonic, in which the dimensions of the muscle change, and isometric, in which the muscle remains the same size but the tone increases.
When there is a repeated isotonic contraction without relaxation, it can lead to painful contractions. In contrast, isometric contractions create a feeling of effort. Anxiety related to making choices and taking action can cause a state of activation and excitement that leads to tension in the muscles.
The muscular system is closely linked to emotions, which can be described through observable behaviors or subjective feelings related to internal visceral manifestations. The nervous system is also an essential factor in this process. It is a complex system that processes bioelectric signals and is divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The PNS includes the sensory and motor systems, with the latter comprising the somatic and autonomic systems. The somatic system controls voluntary movements, while the autonomic system controls involuntary movements in internal organs and glands.
The autonomic system, which is responsible for involuntary smooth muscle movements in the circulatory, respiratory, urogenital, and gastrointestinal systems, can be influenced by shiatsu. By applying static and prolonged pressure, shiatsu can activate the parasympathetic nervous system and prevent the sympathetic nervous system from reacting negatively. This can help relieve tension and promote relaxation.
Shiatsu can affect somato-visceral reflexes, which are the basic units of communication between the CNS and the ANS. By targeting these reflexes, shiatsu can help promote balance between the sympathetic and parasympathetic systems, which work together rather than in opposition to find the best response for each situation.
In conclusion, shiatsu is an effective technique for promoting relaxation and relieving tension by targeting the muscular and nervous systems. By focusing on the somato-visceral reflexes, shiatsu can help restore balance and promote overall well-being.
Bibliography
Zen Shiatsu, S.Masunaga
The complete book of Shiatsu therapy, T. Namikoshi
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