[abstract] MAXIMAL PERFORMANCE OF MAN AT 43.3 ATA.

Rubicon Research Repository/Manakin Repository

[abstract] MAXIMAL PERFORMANCE OF MAN AT 43.3 ATA.

Show full item record


Title: [abstract] MAXIMAL PERFORMANCE OF MAN AT 43.3 ATA.
Author: Dwyer, JV; Saltzman, HA; O'Bryan, R
Abstract: Four U. S. Navy divers performed sub-maximal and maximal work in 4.4 degree C water on an underwater cycle ergometer at 1.6 and 43.4 ATA (1400 fsw). The VO max (the V02 at the maximal tolerated six-minute work load) under control conditions at 1.6 ATA was 2.86-3.00 Lamin-1 in three divers, and decreased to 1 . at I-2.36 L'min-1 at the maximal depth. The fourth diver increased his VO max from 1.53 L-min-1 at 1.6 ATA to 1.90 L-min-1 at 43.4 ATA. Reductions in maximal external work performance on the ergometer averaged 30 percent at depth; measured work on the ergometer was generally restricted to 75 Watts or less. End-tidal PC02 increased concordantly with VO at depth but did not exceed 50 mm Hg. Carbon dioxide retention was not a significant factor in work limitation. The VE-during maximal work did not remain a fixed percentage of the MVV at 43.3 ATA, but there was no consistent tendency for the divers to respire nearer their MVV. Dyspnea was severe at depth during exercise, and the perceived effort expended to breathe was at the extreme limit for each man. The observed severe restriction of work capacity and V02max underwater at 43.4 ATA is in sharp contrast to extrapolations based on observations in dry chambers, breathing gases of comparable or greater densities at lesser depths.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held May 13-16, 1977. Holiday-Inn, Toronto, Ontario, Canada (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/4162
Date: 1977

Files in this item

Files Size Format View
abstract.txt 259bytes Text file View/Open

This item appears in the following Collection(s)

  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

Show full item record

Browse

My Account