Source: Annual Congress 2002 - Physiotherapy: assessment and outcome in healthy subjects and patients with chronic lung disease
Disease area: Pulmonary vascular diseases

Abstract

The purpose of this study was to examine the effect of body position on oxygen consumption (VO2) in conjunction with the well-documented gravity-dependent hemodynamic and pulmonary changes. Thirty-two young healthy subjects were studied in five randomized body positions: sitting, supine, left and right side lying and head down. In addition to VO2, dependent variables included heart rate (HR), and systolic and diastolic blood pressure (SBP and DBP). Compared with the recumbent and head down positions, sitting resulted in the highest HR, SBP, DBP, and VO2. Left side lying and supine resulted in the lowest HRs. Left side lying also resulted in the lowest SBPs and DBPs and VO2. The head down position tended to produce intermediate HR, SBP, DBP, and VO2. Our results support that VO2 reflects position-dependent changes in cardiac output (CO). Left side lying restricts cardiac filling compared with right side lying, correspondingly reducing VO2. The apparent increased metabolic demands of the sitting position are of particular interest given that this position has been associated with reduced work of the heart in patients at risk. Cardiac output is less compromised in upright positions lending further support for the upright position in patients at risk of cardiac insufficiency or in failure.

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A. Y. M. Jones, E. Dean (Kowloon, Hong Kong; Vancouver, Canada). Resting oxygen cost of different body positions: therapeutic implications. Eur Respir J 2002; 20: Suppl. 38, 1161

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