Understanding how to regulate breathing, especially Yoga Sudarshan Kriya – RP (also known as SKY Breath and related practices) stress requires looking at its effects on the body’s hormonal and neuroendocrine systems. In addition to being directly sympathetic nervous system (which activates the body’s fight or flight response) and the opposite parasympathetic nervous system (slows the body down, restores calm and supports recovery, healing and long-term stability) as in a previous postBreathing is also linked to other hormone-regulating systems.(1)
Also key to this process is the hypothalamic-pituitary-adrenal (HPA) axis, which controls the release of stress hormones such as cortisol and adrenocorticotropic hormone (ACTH). (2) When chronically activated, this system can disrupt mood, immune response, and metabolic stability. balance by down-regulating stress hormones while increasing hormones associated with recovery and emotional well-being, including prolactin and oxytocin(5,6,7,8)
Chronic stress sets off a predictable cascade: The hypothalamus signals the pituitary gland to release ACTH, prompting the adrenal glands to release cortisol. Although this response is adaptive in acute situations, persistent elevations in cortisol contribute to emotional exhaustion, sleep disturbances, and systemic inflammation.(1) New research suggests that SKY breathing can stabilize these hormones and promote what we might call “well-being.” link hormones (prolactin, oxytocin) and lowering chronic stress hormones. The result: a body better equipped for rest, recovery, and resistance. (7,8)
What does it look like? endocrine system? When the brain perceives a threat, the hypothalamus triggers the pituitary gland to release ACTH (adrenocorticotropic hormone), which prompts the adrenal glands to release cortisol.(2,3) Cortisol is important in the short term; it activates energy resources, accelerates understanding and suppresses unimportant tasks. But when elevated cortisol persists, it leads to wear and tear: mood disorders, immune suppression, metabolic dysregulation, and cardiovascular stress.(2,3)
Several studies report significant reductions in cortisol and ACTH following SKY practice. For example (6-9): In the study of topics with alcohol dependence, those who practiced SKY showed a significant reduction in cortisol and ACTH over a two-week period compared to controls.(8,9) Another study of medical students showed that after SKY sessions their serum cortisol levels decreased significantly before exams (10). A broader descriptive review concluded that SKY “modulates the HPA axis” and thus plays a role in reducing the hormonal fight-or-flight state.
Less discussed but more important in the basic physiology of stress are hormones like prolactin and oxytocin, which seem to increase SKY. One study on the neurophysiological effects of SKY noted increased prolactin and oxytocin levels, which promote feelings of relaxation and social bonding. Research suggests that SKY likely releases prolactin, vasopressin, and oxytocin via vagal afferents to the hypothalamus and anterior pituitary.
Why is this important? Because these hormones are associated with parasympathetic activation, emotional regulationconnectivity and stability. The transition is not just “less stress hormones” but “more restorative/regulatory hormones”. In practice, this means that regular use of SKY Breath can not only reduce the negative stress of cortisol/ACTH, but also create a positive foundation of resilience and emotional well-being.
What does this mean for anyone interested in changing their stress hormones? This can be a low barrier to entry and drug-free route. In several studies, Sudarshan Kriya Yoga or SKY Breath has shown measurable changes in the body’s stress chemistry. These results echo what larger reviews have found: SKY regulates the HPA axis, the body’s central stress response system, by turning off the fight-or-flight signal and amplifying its calming effects. vagus nerve. In turn, the body releases more “feel good” and “bonding” hormones such as oxytocin and prolactin, creating a hormonal environment that supports trust, empathy, and recovery.(6,7,8)
This balance effect was particularly significant in clinical settings. In the study of people who recover from them depression, anxietyand drug use, SKY practice not only reduced cortisol and ACTH levels, but also improved mood and sleep quality—benefiting from this standard therapy He did not produce it himself. Even a single session of SKY has been shown to lower levels of stress hormones and increase indicators of immune strength, such as IgG antibodies, which in turn strengthens both mental and physical resilience (6,7,8,9,10,11,12).
In everyday terms, this means that practicing SKY is not a relaxation exercise; it’s a way to reset your body’s stress thermostat. Just a few minutes of rhythmic breathing can calm the mind in a quiet moment, while consistent exercise gradually trains the body to recover from stress more quickly, regulate emotions more easily, and maintain energy throughout the day. Whether you’re a clinician helping patients deal with chronic stress or someone who just wants to feel more balanced, breathing like this offers a science-based way to align your hormones and your life.
