Exercise Intolerance in Post-Viral and Post-Surgical Dysautonomia: A Lived Experience with Mechanistic Insight and Recovery Trajectory
Abstract
Bruce H.Knox
Background: Exercise intolerance is a defining and debilitating feature of dysautonomia, particularly in post-viral and post- surgical states. It reflects impaired autonomic regulation of cardiovascular and metabolic responses to exertion, often driven by small-fiber neuropathy, baroreflex dysfunction, and cardiac denervation.
Case Presentation: I present a lived experience of profound exercise intolerance following a cumulative “three-hit” injury: Chikungunya virus infection, cardiac tamponade, and emergency open-heart surgery. This sequence resulted in severe autonomic dysfunction, including chronotropic incompetence, orthostatic hypotension, and gastroparesis. For several years, my heart rate remained fixed at approximately 70 bpm, irrespective of exertion, rendering meaningful physical activity impossible.
Discussion: Exercise intolerance in this context is mechanistically explained by impaired sympathetic activation, denervation supersensitivity, and delayed autonomic reinnervation. Recovery reflects gradual nerve regeneration, receptor normalisation, and restoration of vagal balance.
Conclusion: This case demonstrates that severe exercise intolerance due to dysautonomia can improve, but only through prolonged, incremental recovery over years. Understanding the biology of autonomic repair provides both clinical insight and patient hope.