Does the psychological sigh reduce cortisol

Andrew Huberman discusses the effects of the physiological sigh, a breathing technique involving a big inhale, a short second inhale, and a long exhale. He notes that this practice significantly reduces stress and balances the sympathetic and parasympathetic nervous systems. While he doesn't specifically mention cortisol, the sighing practice, especially when done cyclically for five minutes daily, leads to reductions in stress over a 24-hour cycle, suggesting it could influence cortisol levels indirectly by reducing stress 1.