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Others can develop something called POTS, which stands for postural orthostatic tachycardia syndrome, and can cause sharp spikes in the heart rate and dizziness.

Researchers will target a condition known as postural orthostatic tachycardia syndrome, or POTS, that is marked by irregular heartbeat, dizziness and fatigue.

That approach excluded more recently defined ailments like postural orthostatic tachycardia syndrome, or POTS, which received a code in the U.S. only in October 2022.

“In that case, I doubt that his orthostatic blood pressure is caused by his nerves,” he said.

There are four tests total: the orthostatic test, leg recovery test, running performance test, and cycling performance test.