Abstract
Humans and animals give several impressions to their recipients with their postures. In this study, the influence of postures on a body was examined through the perspective of the endocrine system and the autonomic nervous system. The subjects were 18 healthy adults (7 males and 11 females). A slouching posture like arching back was defined as a low power pose (LP), and a posture straightening back and throwing out chest is defined as a high power pose (HP). Starting at rest, the subjects took LP posture and changed to HP posture, and their autonomic nervous functions were measured and their saliva was collected before and after taking each posture. In taking LP posture, the decrease of the parasympathetic nervous activity, the increase of the pathetic nervous activity and the increase of chromogranin A in saliva were observed. The increase of the autonomic nervous activity, and the decrease of chromogranin A which had been increased by taking LP posture were observed by taking HP posture. There was no influence on cortisol by taking either of the postures. This study suggested that bad postures such as curving back affected stress reactions through the perspective of the endocrine system and the automatic nervous system.
Highlights
IntroductionAs the use of smartphones, tablets and personal computers is widespread, it is becoming common for people to take uncomfortable postures such as slouching
The parasympathetic nervous activity decreased by taking the low power pose (LP) after at rest, and increased by changing the pose to high power pose (HP) posture (Figure 2)
The sympathetic nervous activity increased by taking LP posture after at rest, and it did not change by taking HP posture
Summary
As the use of smartphones, tablets and personal computers is widespread, it is becoming common for people to take uncomfortable postures such as slouching. Many of them hold their smartphones all the time in a crowded train, their living room and even inside their bed, and realize the time flies just getting into SNS or games. The common fact among them is postures. Humans and animals give several impressions to their recipients with their postures. For example, give us a strong impression by posing with their chest wide open (high power pose). Cats give us weak and unconfident impression by posing with their back hunched (low power pose)
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