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Orthostatic intolerance occurs in humans because standing upright is a fundamental stressor, so requires rapid and effective circulatory and neurologic compensations to maintain blood pressure, cerebral blood flow, and consciousness. When a human stands, about 750 ml of thoracic blood are abruptly translocated downward.
A menhir (/ ˈ m ɛ n h ɪər /; [1] from Brittonic languages: maen or men, "stone" and hir or hîr, "long" [2]), standing stone, orthostat, or lith is a large upright stone, emplaced in the ground by humans, typically dating from the European middle Bronze Age. They can be found individually as monoliths, or as part of a group of similar ...
Orthostatic hypertension is diagnosed by a rise in systolic BP of 20 mmHg or more when standing. Orthostatic diastolic hypertension is a condition in which the diastolic BP raises to 98 mmHg or over in response to standing, [ 2 ] [ 3 ] [ 4 ] but this definition currently lacks clear medical consensus, so is subject to change.
Standing with folded arms; Standing contrapposto, with most of the weight on one foot so that its shoulders and arms twist off-axis from the hips and legs in the axial plane; Standing at attention, upright with an assertive and correct posture: "chin up, chest out, shoulders back, stomach in", arms at the side, heels together, toes apart
The position of at attention, or standing at attention, is a military posture which involves the following general postures: [1]. Standing upright with an assertive and correct posture: famously "chin up, chest out, shoulders back, stomach in".
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Only continuous beat-to-beat BP measurement during an active standing-up maneuver can document this condition. [32] Classic orthostatic hypotension is frequently characterized by a systolic blood pressure decrease of ≥20 mmHg or diastolic blood pressure decrease of ≥10 mmHg between 30 seconds and 3 min of standing. [33]