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Kinetic Elasticity Model of ME/CFS — v8.1
Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is characterized by Post-Exertional Malaise (PEM), a delayed and often severe exacerbation of symptoms followingphysical, cognitive, emotional, or autonomic challenge. Current models often emphasize energymetabolism, but such models do...
Published September 30, 2026 | Version v1
Preprint Open
Kinetic Elasticity Model of ME/CFS — v8.1
Authors/Creators
Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is characterized by Post-Exertional Malaise (PEM), a delayed and often severe exacerbation of symptoms following physical, cognitive, emotional, or autonomic challenge. Current models often emphasize energy metabolism, but such models do not by themselves explain the delayed, nonlinear temporalstructure of PEM.
This paper proposes the Kinetic Elasticity Model (KEM), in which some ME/CFS phenotypes
arise through different upstream mechanisms that converge on a common downstream
regulatory bottleneck in receptor signaling. One proposed phenotype involves functional GPCR
autoantibodies and altered adrenergic and muscarinic signal processing. Another involves
chronically elevated endogenous neuronal/autonomic activation, for example under persistent
stress or hypervigilance. Despite different initiating mechanisms, both routes converge through
increased receptor utilization, GRK-dependent phosphorylation, β-arrestin recruitment, receptor
desensitization/internalization, trafficking, and delayed receptor recovery.
The model proposes that loss of kinetic elasticity in GPCR signaling networks transforms time
itself into a physiological burden. When receptor recovery and recycling are sufficiently slow
relative to the temporal structure of repeated activation, desensitized receptor pools may
accumulate and the system may cross a functional threshold only after a substantial delay.
PEM latency may therefore emerge from receptor-system kinetics rather than from an
immediate response to the initiating exertion alone.
Version 8.1 separates three coupled state variables with distinct roles: accumulated regulatory
burden D(t), functional recovery capacity C(t), and metabolic/material resource reserve Q(t). It
also introduces a dynamical ablation protocol to test which level of coupling is necessary for
delayed symptom worsening to emerge from the model rather than from an imposed delay.
The model originated from repeated short- and long-timescale observations of the functional
response to SR-14968 and subsequently formalized the proposed dynamics mathematically. It
introduces a mechanistic overhang function, a convolution-based recovery model, and a
coupled load–recovery-capacity formulation. The characteristic recovery timescale is
parameterized by activation, internalization, and recycling components and may depend on
effective energy availability. The framework predicts measurable differences in PEM onset,
peak, and recovery times across individual episodes. The model is intended for testing across
multiple episodes with shared parameters rather than fitting retrospectively to a single 12–48
hour observation.
The model proposes that pharmacological perturbation of G-Protein/Arrestin-Bias and
downstream excitatory/autonomic regulation can provide functional probes of the bottleneck.
Current ME/CFS multi-omics literature provides an independent context for the proposed
metabolic/resource dimension through reported immune changes [1], CSF metabolic and
lipidomic changes [2], circulating proteomic differences [3], broader multi-omics evidence [4],
and literature linking GPCR signaling with immune remodeling and metabolic reprogramming
[5]. Clinical observations involving differential responses to candidate G-Protein-biased, partial,
allosteric, and NMDA-modulating interventions motivate this hypothesis.
Two additional open extensions are incorporated. First, persistent regulatory activity may
impose a metabolic and material supply burden through receptor/protein turnover, membrane
remodeling, trafficking, and associated energetic costs. Second, prolonged, deliberately
enabled sleep blocks may create a qualitatively different recovery state from a conventional
single night by providing extended periods of reduced signaling and physiological demand in
which slower recovery processes can proceed.
The Kinetic Elasticity Model links upstream phenotypic heterogeneity, receptor signaling
kinetics, delayed nonlinear symptoms, metabolic/resource constraints, prolonged recovery
states, and pharmacological perturbability.