Most people hear “orthostatic tachycardia” or “POTS” and immediately think, “My sympathetic system must be overactive.” �But that framing is way too simple — and honestly, not very helpful. Standing upright isn’t a single switch. �It’s a multi-sensory, multi-output reflex that uses many systems at once: �• autonomic (sympathetic parasympathetic) �• skeletal motor �• respiratory �• vestibular proprioceptive inputs �• cardiovascular adjustments So when your heart rate spikes or you feel dizzy when
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When astronauts return to Earth, they may experience orthostatic intolerance, a condition where the body struggles to adjust to the upright position in Earth’s gravity. During spaceflight, their bodies adapt to microgravity, leading to weakened leg muscles and cardiovascular changes. When back on Earth, standing up can cause a drop in blood pressure, leading to fainting or lightheadedness. It takes time for their bodies to readjust to Earth’s gravity and regain normal function. This phenomenon h
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