{"id":1651,"date":"2020-06-19T16:37:16","date_gmt":"2020-06-19T20:37:16","guid":{"rendered":"https:\/\/dan.devhammer.com\/?post_type=dan_health_resources&#038;p=1651"},"modified":"2023-08-31T10:17:12","modified_gmt":"2023-08-31T14:17:12","slug":"use-of-dive-computers","status":"publish","type":"dan_health_resources","link":"https:\/\/world.dan.org\/fr\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/use-of-dive-computers\/","title":{"rendered":"Chapitre 2 : Utilisation efficace de l'ordinateur de plong\u00e9e"},"content":{"rendered":"<p class=\"has-medium-font-size\"><strong><em>\u201cDivers are surprised when symptoms of DCS develop after dives that appeared safe according to their dive computers. Remember, models reflect an average diver, not you.\u201d<\/em><\/strong><\/p>\n\n\n\n<p>In recent years, dive computers have supplanted dive tables as the primary means of regulating dive profiles. Dive computers offer an advantage in that they enable the diver to dynamically establish different compartments as the controlling compartment, as conditions change during a dive. In reality, the compartments in a dive computer\u2019s modeling software do not have to represent any particular tissue, as long as the guidance provided by the model results in an acceptable outcome \u2014 specifically, very little DCS.<\/p>\n\n\n\n<p>In this chapter, you\u2019ll learn:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"#cautions\">Pr\u00e9cautions importantes<\/a><\/li>\n\n\n\n<li><a href=\"#guidelines\">Lignes directrices de base<\/a><\/li>\n\n\n\n<li><a href=\"#tips-tricks\">Conseils et astuces sp\u00e9cifiques<\/a><\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"cautions\">Pr\u00e9cautions importantes<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"256\" height=\"171\" src=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/dive-computers-DAN-256x171-1.jpg\" alt=\"\" class=\"wp-image-11934\" srcset=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/dive-computers-DAN-256x171-1.jpg 256w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/dive-computers-DAN-256x171-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 256px) 100vw, 256px\" \/><\/figure>\n<\/div>\n\n\n<p>While the guidance provided by decompression models can be very useful, it is important for divers to keep in mind that dive schedules \u2014 whether they are presented in printed tables or on the screen of a dive computer \u2014 are limited in what they measure and in the assumptions upon which the model was constructed. Tissue compartment parameters can be adjusted, or new compartments can be added to an algorithm, if experience shows deficiencies in a given model \u2014 but in real time, the calculations are limited by the variables that are being processed. Algorithms can estimate limits based on time and pressure (depth) profiles for a given breathing gas, but they are not able to compute the impact of myriad real-time factors, including thermal status, exercise intensity, joint forces and a host of individual predispositions that are currently not well understood, let alone quantifiable in their impact on decompression stress.<\/p>\n\n\n\n<p>Divers are often surprised when symptoms of DCS develop after dives that were conducted within the limits of their dive computers. It is important to remember, though, that while mathematical models predict outcomes, they do not guarantee them. The fact that a dive was conducted within the limits suggested by a dive computer (or a dive table) does not make a DCS hit \u201cundeserved.\u201d The mathematical algorithms provide guidance that must be evaluated and tempered by a thoughtful diver.<\/p>\n\n\n\n<p>De nombreux plongeurs ignorent \u00e9galement que les ordinateurs de plong\u00e9e utilisent de nombreux mod\u00e8les math\u00e9matiques diff\u00e9rents, ou des versions de diff\u00e9rents mod\u00e8les ; il n'existe pas de norme universelle. Un m\u00eame fabricant peut m\u00eame utiliser plus d'un mod\u00e8le, \u00e9ventuellement dans un seul type d'ordinateur. Il est donc extr\u00eamement difficile d'\u00e9valuer les nuances de chaque syst\u00e8me.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"guidelines\">Lignes directrices de base<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-large\"><a href=\"https:\/\/media.world.dan.org\/mdn\/14515.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"256\" height=\"171\" src=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/divers-reviewing-dive-information-139311023-DAN-256x171-1.jpg\" alt=\"\" class=\"wp-image-11937\" srcset=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/divers-reviewing-dive-information-139311023-DAN-256x171-1.jpg 256w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/divers-reviewing-dive-information-139311023-DAN-256x171-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 256px) 100vw, 256px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>There are some basic guidelines that can help to ensure the safe and effective use of a dive computer. The following considerations are intended to offer a somewhat light-hearted insight into what your dive computer can \u2014 and cannot \u2014 do.<\/p>\n\n\n\n<p>Il est utile de penser \u00e0 votre ordinateur de plong\u00e9e de cette mani\u00e8re :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>En tant que concurrent de l'entreprise : Ma\u00eetrisez-le en apprenant ses forces et ses faiblesses.<\/li>\n\n\n\n<li>En tant que rendez-vous : il doit \u00eatre activ\u00e9 pour que la relation fonctionne.<\/li>\n\n\n\n<li>En tant que compagnon : il doit descendre et remonter quand, et seulement quand, vous le faites.<\/li>\n\n\n\n<li>En tant qu'assistant personnel : il vous rappelle les r\u00e8gles et les horaires que vous risquez d'oublier.<\/li>\n\n\n\n<li>En tant qu'acteur : Il r\u00e9cite les r\u00e9pliques sans avoir \u00e0 en comprendre les implications.<\/li>\n\n\n\n<li>En tant qu'homme politique : Ne croyez pas tout ce qu'il vous dit.<\/li>\n\n\n\n<li>As a hotel concierge: It will help you do what you want \u2014 but at a price.<\/li>\n\n\n\n<li>En tant qu'\u00e9tranger : il ne sait pratiquement rien de votre r\u00e9alit\u00e9 personnelle.<\/li>\n\n\n\n<li>En tant que partenaire : Est-il compatible avec vos amis ?<\/li>\n\n\n\n<li>En tant que journaliste : il diffusera votre linge sale.<\/li>\n\n\n\n<li>En tant qu'outil : Utilisez-le de mani\u00e8re appropri\u00e9e.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tips-tricks\">Conseils et astuces sp\u00e9cifiques<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Appuyer sur les bons boutons<\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-large\"><a href=\"https:\/\/media.world.dan.org\/mdn\/14517.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"256\" height=\"170\" src=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/operating-dive-computer-99690310-DAN-256x170-1.jpg\" alt=\"\" class=\"wp-image-11938\" srcset=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/operating-dive-computer-99690310-DAN-256x170-1.jpg 256w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/operating-dive-computer-99690310-DAN-256x170-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 256px) 100vw, 256px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Vous devez savoir non seulement quels boutons appuyer pour faire fonctionner votre ordinateur, mais aussi quel mod\u00e8le math\u00e9matique ou quelle d\u00e9rivation de mod\u00e8le il emploie pour effectuer ses calculs de d\u00e9compression. Il existe une gamme surprenante de mod\u00e8les, allant du conservateur au lib\u00e9ral, et ces diff\u00e9rences peuvent ne pas \u00eatre \u00e9videntes \u00e0 premi\u00e8re vue. Par exemple, un ordinateur peut \u00e9tablir des limites conservatrices pour une premi\u00e8re plong\u00e9e, mais des limites lib\u00e9rales pour des plong\u00e9es r\u00e9p\u00e9t\u00e9es. Il est pr\u00e9f\u00e9rable de s'informer suffisamment sur les diff\u00e9rents mod\u00e8les et d\u00e9rivations disponibles avant de choisir un ordinateur de plong\u00e9e, afin d'\u00eatre s\u00fbr de choisir un ordinateur compatible avec votre propre niveau de tol\u00e9rance au risque. Choisir un ordinateur de plong\u00e9e en se basant uniquement sur la familiarit\u00e9 n'est peut-\u00eatre pas la meilleure strat\u00e9gie. M\u00eame si vous avez obtenu de bons r\u00e9sultats lors de vos pr\u00e9c\u00e9dentes plong\u00e9es avec un ordinateur, cela ne garantit pas qu'il sera le meilleur pour vos futures plong\u00e9es. Accumuler des connaissances demande de l'engagement, mais une planification \u00e9clair\u00e9e de la s\u00e9curit\u00e9 en mati\u00e8re de d\u00e9compression doit \u00eatre une pr\u00e9occupation majeure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Se brancher et s'allumer<\/h3>\n\n\n\n<p>Failing to turn on your dive computer (or to take it with you on a dive) may sound like a joke, but it does happen and can create real problems. No computer can factor in the exposure profile of a previous dive if it was not there. And any decompression model is invalid unless you start using it when you are \u201cclean\u201d \u2014 fully off-gassed from any previous dives. If you forget to take your computer with you on a dive early in a repetitive series, you are then restricted to using tables for the duration of that series (assuming that you are able to manually compute the exposure of the unmonitored dive). And do not even think about hanging your computer on a downline during a surface interval in an effort to compensate for having forgotten it on an earlier dive; there may be stories about that happening, but it is not a responsible practice.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L'utiliser \u00e0 bon escient<\/h3>\n\n\n\n<p>The only person who does not have to worry about taking a dive computer on every dive is the one who uses it solely as a datalogger \u2014 that is, only to record time and depth information instead of to calculate decompression profiles. Remember, however, that using your computer simply to log your time and depth data means that you must still plan all your dives using dive tables and must recompute your repetitive group status afterward, as appropriate. You cannot move in and out of relying on your computer\u2019s decompression computations unless it has recorded all of your exposure profiles.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">N'oubliez pas ses limites<\/h3>\n\n\n\n<p>Dive computers are wonderful at carrying out programmed mathematical computations, but they are blind to the many insights you may have before, during and between your dives. For example, your dive computer knows nothing about your personal health status, your level of physical fitness or your individual susceptibility to decompression stress. It also knows nothing about your thermal stress or physical efforts during or between dives. The fact that many dive computers display water temperature might suggest that thermal stress is factored into the device\u2019s algorithms. A water temperature reading, however, provides no useful information regarding thermal stress, since the diver carrying the device could be wearing anything from a bathing suit to a wetsuit without a hood to a cold-water drysuit with a hood, gloves and cold-water undergarments. More important, it is not yet possible to directly compute the impact of differences in thermal status during different parts of a dive, even if the computer was able to measure the diver\u2019s core temperature and skin temperature in key spots.<\/p>\n\n\n\n<p>We do know that being warm (rather than cool or cold) during the compression and bottom phase of a dive promotes inert gas uptake (not optimal), and that being warm during the decompression phase promotes elimination (optimal). While impractical for the comfort-loving diver, decompression safety is optimized by being neutral or cool during the inert gas uptake phase of descent and bottom time and warm during the inert gas elimination phase of ascent. While the concept of thermal changes on decompression stress is clear, we are still years away from being able to quantify the real-world effects of these factors for dive-planning purposes. Similarly, while some computers are able to track gas consumption, we have much to learn before this information can be meaningfully incorporated into decompression models. Variations in air consumption can reflect differences in the depth of a dive or in the diver\u2019s experience, level of anxiety or degree of physical exertion. The bottom line is that interpreting the precise physiological impact of the interactions among these diverse factors is exceedingly difficult, requiring thoughtful practice by divers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Heed Your Computer\u2019s Readings<\/h3>\n\n\n\n<p>Divers need to pay attention to their dive computers if the information provided is to be of any use. Be aware that confirmation bias can promote risky behavior. \u201cGetting away with\u201d a risky exposure once, twice or even many times may eventually catch up with you. It may not truly be safe for you or for a partner who might have a higher degree of susceptibility to decompression stress. Those who wish to worry less about their exposure will have greater peace of mind if they choose a computer that employs an extremely conservative decompression model. It is also important to pay attention to your dive computer. If you are diving with a group, do not forget that there can be considerable variability in the guidance provided by different computers or computers with different user-selected settings. That means there is considerable benefit in diving with others who use a computer with a similar decompression model and settings, because if modest discrepancies arise, following the most conservative directive will likely not be terribly burdensome for the group. But if members of a group are using dive computers with substantially different models, and each diver wishes to follow his or her own device, it can lead to a breakdown in the buddy system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ne vous fiez pas aveugl\u00e9ment \u00e0 votre ordinateur<\/h3>\n\n\n\n<p>Although heeding your computer is important, do not take its advice unthinkingly. The same profile can sometimes be conducted without problem again and again, right up to the dive where it does not prove safe. Divers often try to blame a specific factor, such as dehydration, for the development of symptoms following one dive but not another. This approach is not productive. The range of variables in play during a dive are rarely identical, and there is a probabilistic element to decompression risk \u2014 that is, chance can play a role in the manifestation of DCS.<\/p>\n\n\n\n<p>La meilleure approche consiste \u00e0 \u00e9viter les extr\u00eames que sont la r\u00e9signation fataliste ou la focalisation suffisante sur une seule solution suppos\u00e9e magique. Il existe de tr\u00e8s nombreuses petites mesures que vous pouvez prendre pour rendre vos plong\u00e9es plus s\u00fbres. La plus importante est de rester dans un profil de temps et de profondeur raisonnablement conservateur et d'ajouter des paliers de s\u00e9curit\u00e9 \u00e0 chaque plong\u00e9e. D'autres mesures importantes consistent \u00e0 minimiser l'intensit\u00e9 de l'exercice et \u00e0 \u00e9viter la surchauffe pendant la phase d'absorption des gaz de la plong\u00e9e, \u00e0 choisir le bon gaz respiratoire, \u00e0 s'entra\u00eener suffisamment pour \u00eatre capable de contr\u00f4ler parfaitement sa flottabilit\u00e9, \u00e0 rester bien repos\u00e9 et bien hydrat\u00e9, \u00e0 choisir des r\u00e9glages plus conservateurs sur l'ordinateur et \u00e0 plonger avec un partenaire qui a les m\u00eames objectifs et qui suit les m\u00eames pratiques. L'ajout de petites marges de s\u00e9curit\u00e9 \u00e0 chaque \u00e9tape peut contribuer \u00e0 cr\u00e9er un coussin de s\u00e9curit\u00e9 confortable. Les ordinateurs de plong\u00e9e sont des outils puissants, mais une bonne connaissance de la physiologie de la plong\u00e9e, une bonne condition physique et le respect de pratiques r\u00e9fl\u00e9chies constituent la meilleure protection pour les plongeurs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Gardez-le avec vous<\/h3>\n\n\n\n<p>Si vous pr\u00e9sentez des sympt\u00f4mes de DCS, vous devriez garder votre ordinateur avec vous lorsque vous vous rendez \u00e0 un examen m\u00e9dical. Certains \u00e9tablissements peuvent avoir la possibilit\u00e9 de t\u00e9l\u00e9charger ou de consulter votre profil pour faciliter l'\u00e9valuation de votre cas. Le personnel m\u00e9dical appr\u00e9ciera certainement de voir la confirmation de votre description des \u00e9v\u00e9nements qui ont pr\u00e9cipit\u00e9 vos sympt\u00f4mes.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-text-align-right\"><strong>Suivant : <a href=\"https:\/\/world.dan.org\/fr\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/diagnosing-decompression-sickness\/\">Chapter 3 \u2013 Diagnosing Decompression Sickness &gt;<\/a><\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>&#8220;Divers are surprised when symptoms of DCS develop after dives that appeared safe according to their dive computers. Remember, models reflect an average diver, not you.&#8221; In recent years, dive [&hellip;]<\/p>\n","protected":false},"featured_media":11936,"parent":1642,"menu_order":38,"template":"","dan_health_resource_types":[405],"class_list":["post-1651","dan_health_resources","type-dan_health_resources","status-publish","has-post-thumbnail","hentry","dan_health_resource_types-dive-medical-reference-books"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Chapter 2: Effective Use of Your Dive Computer - DAN World<\/title>\n<meta name=\"description\" content=\"Divers can still get DCS after diving within their computer&#039;s limits. 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