Recovery Time as a Dynamic Outcome Measure in ME/CFS: Linking TRPM3-Dependent Calcium Signaling, Mitochondrial Reset, and the Unified Reset Model. Conceptual Note — URM / Dynamic Medicine Series.

This Conceptual Note proposes that recovery time after perturbation should be considered a central dynamic outcome measure in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). Rather than defining ME/CFS primarily through reduced capacity or fatigue, the paper interprets post-exertional malaise as a failure of recovery dynamics: a prolonged or unstable reset window in which the system does not efficiently return to individual baseline after physical, cognitive, autonomic, infectious, emotional, or metabolic stress. The note links recent findings on deficient TRPM3-linked mitochondrial Ca²⁺ influx in natural killer cells with a systems-medicine interpretation of ME/CFS. TRPM3-dependent calcium signaling is discussed as a possible cellular micro-mechanism connecting impaired immune-cell activation, mitochondrial response, and delayed recovery after exertion. Within the Unified Reset Model (URM), ME/CFS is framed as a disorder of reset capacity rather than simple deconditioning. The paper argues that treatment effects, pacing strategies, and future clinical studies should evaluate not only increased activity or performance, but also shortening of recovery time, reduced depth of post-exertional crashes, improved autonomic stabilization, and faster return to individual baseline. The central proposal is that in ME/CFS, the first sign of recovery may not be doing more. It may be recovering faster.