Lactate and panic across infusion and exercise contexts: an interoceptive context-gating hypothesis

Lactate is an oxidative fuel, a gluconeogenic precursor, and a signaling molecule. Sodium lactate challenges can provoke panic in susceptible patients, whereas exercise-associated hyperlactatemia seldom does. However, lactate clamps at rest and during exercise also provide exogenous lactate without reported panic, so endogenous versus exogenous origin cannot explain the observations. We review this three-way comparison and distinguish psychiatric challenges from physiological clamps in participant selection, formulation, exposure kinetics, nutrition, and symptom ascertainment. No universal blood lactate threshold or minimum infusion duration for panic has been established. Sodium loading, acid–base changes, and stereoisomer composition deserve controls; glucose coadministration provides direct evidence that formulation can modify challenge sensitivity. We propose that host vulnerability and the delivered physiological perturbation interact with expectations and perceived control through interoceptive processing. Exercise-related motor prediction is one possible moderator, rather than a necessary condition for tolerating lactate. Insular context gating remains unproven and must be tested against chemical and respiratory explanations in matched-exposure studies. The revised framework accommodates tolerated infusions and occasional exercise-associated panic without treating lactate itself as uniformly threatening or reassuring.