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Vyana Physical level: Vyana, the fifth prana, pervades the whole body and acts as reserve energy. It helps all the other pranas when they require an extra boost. When one overexerts and feels extremely tired, a rush of energy comes, which enables one to continue. This 'second wind' is the vyana experience. Vyana also regulates and coordinates all the muscular movements, aids in sending impulses to different parts of the body, and causes the flow of perspiration and gooseflesh. Vyana causes all the pranas, major and minor, to function by being their accessory.
Subtle level: Vyana brings about circulation through all the five koshas and is responsible for their differentiation. It pervades the spatial element in the body, and is the vehicle of consciousness through the body. In the condition of excitement, due to its swift motion, it makes the mind excited and deluded. The motion of consciousness becomes intense at such times.
Indications of imbalance: When vyana, the expansive energy, is unbalanced, there is lack of coordination, tremors, inability to reach out to people, and the mind is erratic.
Density and colour of pranas The five pranas have varying densities of ionic fields. Udana is the least dense, then follow prana, samana and apana. Vyana, which flows throughout the whole body, has a density which is the average of all the others. The ionic fields of the pranas may be visualized as swirling clouds of differing colours and hues, capable of expanding and contracting. The colours are created due to the emission of photons, when electrons change their energy levels from higher to lower frequencies. The Amritanada Upanishad describes the colours of the different pranas thus (v. 34-37):
रक्तवर्णो मणिप्रख्यः प्राणवायु प्रकीर्तितः। अपानस्तस्य मध्ये तु इंद्रकोपसमप्रभः।
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