The Head-Up Tilt Table Test as a Measure of Autonomic Functioning among Patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.
Jason, Leonard A, McGarrigle, William J, Vermeulen, Ruud C W·Journal of personalized medicine·2024
This study tested 193 people with ME/CFS using a tilt table test to check if they had problems with their autonomic nervous system (the system that controls heart rate and blood pressure). About one in three participants showed signs of orthostatic intolerance—a condition where the body struggles to maintain proper blood pressure and heart rate when standing. People with these problems reported worse sleep, more severe post-exertional malaise (exhaustion after activity), and greater physical limitations.