There is currently no simple metric to quantify autonomic function or dysfunction.

“today we don't really have a way of quantifying the level of autonomic function or dysfunction in a very simple way it's not like resting heart rate although resting heart rate is involved for instance if you haven't slept well for a few nights or if you're particularly stressed overtrained you wake up in the morning with a significantly elevated heart rate however there is no simple metric like heart rate or blood pressure or even cortisol level that can tell you whether or not your autonomic function is imbalance that is the sympathetic and parasympathetic systems of your autonomic nervous system are in the best possible balance to generate tenacity and willpower we don't yet have such a metric”