Whether it's activity intolerance post-PE, post-COVID, or post-deployment, the proverbial magic bullet will not be found. If you want to identify modifiable contributors, you're going to need a CPET.

Histamine Intolerance: A condition characterised by an imbalance between ingested histamine levels and the body’s ability to degrade it, frequently due to reduced DAO activity.

Beta-blockers act by slowing resting heart rate (and blunting the heart rate response to exercise.The latter is a pernicious cause of activity intolerance that often goes unchecked. Even when the ...