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CARDIOCIRCUIATORY RESPONSES TO UPRIGHT TILT AT SEA LEVEL AND HIGH ALTITUDE

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Title: CARDIOCIRCUIATORY RESPONSES TO UPRIGHT TILT AT SEA LEVEL AND HIGH ALTITUDE

Authors: M. Amjad Hameed , Charles S. Fulco , Allen Cymerman , P.B Rock 

Journal: Journal of Pakistan Medical Association

HEC Recognition History
Category From To
Y 2024-10-01 2025-12-31
X 2023-07-01 2024-09-30
X 2022-07-01 2023-06-30
X 2021-07-01 2022-06-30
X 2020-07-01 2021-06-30
W 2012-07-01 2020-06-30
X 2011-05-13 2012-06-30
Y 1900-01-01 2005-06-30

Publisher: Pakistan Medical Association.

Country: Pakistan

Year: 1991

Volume: 41

Issue: 12

Language: English

Categories
Altitude Medicine (11) Aerospace Medicine (4) Physiology (6728) Internal Medicine (19275) Cardiology (10889)

Abstract

ABSTRACT


A collaborative study was conducted to measure the càrdiocirculatory responses to upright tilt in eight young men at sea level (SL); after 1h at 4300m simulated altitude (SA) and at 18h, 66h and 1 14h during residence at 4300m (HA). Heart rate (HR), stroke volume (SV), cardiac output (Ca), calf blood flow (CBF), blood pressure (BP) and total peripheral resistance (TPR) were obtained during supine rest and after 13 min of 60° head-up tilt using an impedance monitor and an electrosphygmomanometer. SL to HA changes in blood volume (BV) were calculated from hematocrit and hemoglobin values. Supine HR, TPR and BP were increased while SV, CO and CBP were reduced SL to HA (P

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