Effect of Cold Gas Inhalation on Cardiac Rate in Man at Depth. Preliminary study.

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Effect of Cold Gas Inhalation on Cardiac Rate in Man at Depth. Preliminary study.

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Title: Effect of Cold Gas Inhalation on Cardiac Rate in Man at Depth. Preliminary study.
Author: Flynn, ET; Alexander, JM; Hoke, B; Jackson, DL
Abstract: Two Navy divers breathed first warm and then cold helium-oxygen mixtures while performing graded exercise on a bicycle ergometer at simulated depths of o, 200, 400, 600, 800, 850, and 1000 feet of seawater. In all cases, heart rate increased in proportion to the increase in oxygen consumption with exercise. When compared with warm gas control values, no consistent changes in heart rate were apparent in either subject during cold gas inhalation through a depth of 800 feet. At 850 and 1000 feet, however, both subjects demonstrated a significant reduction in exercising heart rate on cold gas. The potential mechanisms underlying these changes in cardiac rate and their impact in terms of cardiovascular performance and exercise tolerance are discussed. (Author)
Description: Citation Status: Active; Citation Classification: Unclassified; Title Classification: Unclassified; Report Classification: Unclassified; Identifier Classification: Unclassified; Abstract Classification: Unclassified; Distribution Limitation(s): 01 - APPROVED FOR PUBLIC RELEASE; Information provided by the Department of Defense and the Defense Technical Information Center (http://www.dtic.mil/) is considered public information and may be distributed or copied unless otherwise specified. Use of appropriate byline/photo/image credits is requested.
URI: http://archive.rubicon-foundation.org/4798
Date: 1976

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