[abstract] PATTERN ANALYSIS OF DEPTH-TIME PROFILES RECORDED BY DIVE COMPUTERS

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[abstract] PATTERN ANALYSIS OF DEPTH-TIME PROFILES RECORDED BY DIVE COMPUTERS

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Title: [abstract] PATTERN ANALYSIS OF DEPTH-TIME PROFILES RECORDED BY DIVE COMPUTERS
Author: DeNoble, PJ; Vann, RD; Freiberger, JJ; Brubakk, AO
Abstract: INTRODUCTION: Dive computers offer divers the freedom to change depth at will with instantaneous adjustment of decompression requirements. Because the irregularity of these multilevel dives makes maximum depth and bottom time unsuitable for their characterization, we developed an algorithm to categorize computer-recorded depth-time profiles as square, multilevel, or intermediate. METHODS: Our categorization rules were based on the fraction of the dive time spent in four depth zones: descent, bottom, multilevel, and decompression. The descent zone is from the surface to 85percent of the maximum depth (maxD). The bottom zone is the part of the dive deeper than 85percent of maxD. The multilevel zone is ascent from 85percent to 25percent of maxD, and the decompression zone is less than 25percent of maxD. A square dive has more than 40percent of the total dive time in the bottom zone and not more than 30percent in the multilevel and decompression zones. A multilevel dive has at least 40percent of the total dive time in the multilevel zone. All other dives are intermediate. The algorithm also computes ascent rates and decompression times at 20 and 10 fsw. We applied this algorithm to the dive profiles of cold-water wreck divers in Scapa Flow, warm-water live-aboard divers, and Caribbean diving fishermen. RESULTS: Pattern analysis indicated differences in the prevalence of square and multilevel diving as well as in ascent rate and decompression diving. DISCUSSION: Dive profile pattern analysis provided a simple method for describing the irregular dive profiles recorded by dive computers.
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: http://archive.rubicon-foundation.org/1421
Date: 2004

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

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