Pain and pain processing is regulated by a network of nerves generally referred to as pain receptors (Jenny et al., 2002, p. 58). Studies have shown that the central processing of mechanical stimuli and innocuous are greatly altered by spinal manipulation due to an increase in pain tolerance and an increase in pain threshold levels.
However, the study also showed a reduction in pain around the lumber skin after spinal manipulation(Santilli et al., 2006, p. 75). When a pin was pricked on patients before and after therapy, a difference in the level; of pain was observed. The pain was more before therapy compared to after therapy. This makes the topic more controversial since a mixture of the result are registered about this effect on pain receptors.
While certain pain receptors are limited in their response to stimulus, the majority are responsive to more than one of the following excitation factors: 3 chemical substances, such as histamine, prostaglandins, bradykinin, and acetylcholine; 1 mechanical tension of trauma; 2 most of heat and cold; and 3 chemical substances, such as histamine, prostaglandins, bradykinin, and acetylcholine.
Pain receptors do not adapt or become less receptive to repetitive stimuli, unlike most sensory receptors in the body. The receptors grow more receptive over time if those clauses are followed. This is that a man will continue to be mindful of tissue injury as long as a painful trigger exists.
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