Retrieving "Respiratory Effort" from the archives

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1. Sighing

   Linked via "respiratory effort"

   $$\text{Sigh Frequency} (fs) = \frac{1}{T{reset}} \cdot \left(1 - e^{-\lambda V_s}\right)$$
   Where $T{reset}$ is the theoretical average time required for surfactant molecular realignment, $\lambda$ is the pulmonary viscosity coefficient, and $Vs$ is the mean sigh volume relative to the resting lung capacity [1]. When $f_s$ drops below the expected baseline for sustained physical activity, it may indicate an over-reli…