The nasal cycle is unknown to many people. It refers to the alternating partial congestion and decongestion of the nasal cavities in primates. It is a visible physiological congestion of the nasal conchae (nasal turbinates) due to selective lateralised activation of one half of the autonomic nervous system by the hypothalamus (cf. hemispheric lateralisation). It completly unrelated to pathological nasal congestion and is comparable to the circadian rhythm (in the broadest sense). The ancient yoga literature describes the nasal cycle in detail and it is the focus of several pranayama (breathing) techniques which have the goal to balance the nervous system/brain. The German physician Richard Kayser described it first in 1895.
- Kayser, R. (1895). Die exakte Messung der Luftdurchgängigkeit der Nase. Arch. Laryng. Rhinol. (Berlin) 8, 101.
Jala Netī is a yogic cleansing technique (one of the shatkarmas; षटकर्म) to clean the sinuses. It facilitates the unobstructed passage of air for pranayama exercises and it creates a clear mind.
- When Jala Netī is done with milk it is called Dhugdha Neti.
- Ghee can also be utilized.
- Essential oils are a effective adjunct.
Sobel, Noam; Khan, Rehan M.; Saltman, Amnon; Sullivan, Edith V.; Gabrieli, John D. E. (1999-11-04). “Olfaction: The world smells different to each nostril”. Nature. 402 (6757): 35.
Stancák A Jr, Kuna M (1994). “EEG changes during forced alternate nostril breathing”. Int J Psychophysiol. 18 (1): 75–9.
D.S. Shannahoff-Khalsa: Selective Unilateral Autonomic Activation: Implications for Psychiatry. CNS Spectr. 2007, 12(8):625-634
Samantaray, S; Telles, S (2008). “Nostril dominance at rest associated with performance of a left hemisphere-specific cancellation task”. International Journal of Yoga.
Muktibodhananda, Swami. (1985). Hatha Yoga Pradipika. New Delhi India: Thomson Press India, for The Yoga Publications Trust.