Peak Breathing (V2) A Mechanistic Hypothesis for Neurological Recalibration and Respiratory–Lymphatic Pumping via Sustained Maximal Lung Expansion

This preprint presents Peak Breathing, a mechanistic hypothesis proposing that sustained maximal lung expansion with an open airway functions as a controllable physiological trigger capable of inducing rapid neurological recalibration. The work reframes yawning as a naturally occurring analog of this maneuver and isolates time sustained at maximal lung expansion as a previously under-examined physiological variable. Drawing on contemporary human imaging and established principles of respiratory mechanics, the manuscript integrates evidence that inspiration is a dominant driver of cerebrospinal fluid (CSF) movement, that deep respiration couples venous and CSF flow dynamics, and that respiration exerts a primary influence on thoracic duct mechanics and central lymphatic transport. Building on the concept of central lymph propulsion, a novel pulmonary-level lymphatic pumping mechanism is proposed in which sustained lung expansion favors lymphatic filling while elastic recoil favors forward propulsion. Nitric oxide signaling is discussed as a permissive or switching mediator, potentially facilitating mechanically driven circulatory and lymphatic effects rather than serving as a primary driver. Rapid affective shifts reported by practitioners are acknowledged as potential reinforcing outcomes rather than causal mechanisms. The maneuver is deliberately structured to prevent hyperventilation and its associated disadvantages. This work does not claim therapeutic efficacy. Instead, it establishes conceptual priority, articulates a clearly falsifiable mechanistic framework, and invites experimental validation or refutation across neurophysiological, lymphatic, and autonomic domains.