AI 中文总结
该研究提出统计非线性动力学框架以评估胃电图的幅频耦合，其度量可区分健康人与胃功能障碍者，为胃电图分析提供了补充性动力学特征。
AI 中文摘要
常规胃电图（EGG）分析通过主频、功率或基于相位的指标总结胃慢波活动，未明确建模依赖振幅的频率动力学。我们开发了一种统计非线性动力学框架，将胃带解析EGG信号表示为随机Stuart-Landau振子，并估计局部有效相位剪切β_eff，这是一种幅频耦合的归一化度量。在60名健康参与者的夜间记录中，有效相位剪切始终为负，可泛化到每份记录的保留部分，且被破坏振幅-相位对齐但保留振幅序列结构的振幅替代物消除。随后我们将该度量应用于16名健康参与者和24名胃功能障碍参与者的空腹与餐后记录，发现各组间相位剪切幅度存在差异，其分类功能障碍的效果与最强的多电极基于相位的行波度量相当。这些发现确立了幅频耦合作为胃带EGG的动力学特征，可补充常规频谱和空间相位度量，同时推动未来多通道观测模型以确定其与慢波传播及胃功能的关系。
英文摘要
Conventional electrogastrography (EGG) analyses summarize gastric slow-wave activity using dominant frequency, power, or phase-based metrics, without explicitly modeling amplitude-dependent frequency dynamics. We developed a statistical nonlinear-dynamics framework that represents the gastric-band analytic EGG signal as a stochastic Stuart-Landau oscillator and estimate local effective phase-shear, $β_{\mathrm{eff}}$, a normalized measure of amplitude-frequency coupling. In overnight recordings from 60 healthy participants, effective phase-shear was consistently negative, generalized to held-out halves of each recording, and was abolished by amplitude surrogates that disrupted amplitude-phase alignment while preserving amplitude-series structure. We then applied the measure to fasted and fed recordings from 16 healthy participants and 24 participants with gastric dysfunction. Phase-shear magnitude differed between groups and classified dysfunction comparable to the strongest multielectrode phase-based traveling-wave measures. These findings establish amplitude-frequency coupling as a dynamical feature of gastric-band EGG that complements conventional spectral and spatial phase metrics, while motivating future multichannel observation models to determine its relationship to slow-wave propagation and gastric function.
