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We hypothesized that putting on a neck compression collar would attenuate orthostatic signs, increase brain the flow of blood, and influence autonomic reactions. Ten members with POTS (9 females, age 36±1 underwent two trials of supine rest, paced deep breathing (6 breaths/min), Valsalva maneuver (40mmHg for 15s), and 70o upright tilt. For just one trial participants wore a neck compression unit (Q30 Innovations). Hypertension, heartbeat, brain circulation velocity, stroke