{"id":2624,"date":"2012-03-21T05:20:04","date_gmt":"2012-03-21T04:20:04","guid":{"rendered":"https:\/\/blogs.bmj.com\/bjsm\/?p=2624"},"modified":"2012-03-21T08:10:09","modified_gmt":"2012-03-21T07:10:09","slug":"persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bjsm\/2012\/03\/21\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\/","title":{"rendered":"Persistent dehydration MYTHS: Prof Tim Noakes comments on BJSM&#8217;s reader poll"},"content":{"rendered":"<h2><span style=\"color: #800080\">BJSM reader poll results<\/span><\/h2>\n<p style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-2627 aligncenter\" src=\"https:\/\/blogs.bmj.com\/bjsm\/files\/2012\/03\/dehydration-pie_revised.jpg\" alt=\"\" width=\"541\" height=\"260\" \/><\/p>\n<h2>By Tim Noakes<\/h2>\n<p>Only 12% of the BJSM readers who answered the poll were correct &#8211; this speaks to the power of the prevailing dogma and marketing messages.<\/p>\n<p>Readers have clearly been influenced by the \u201cScience of Hydration.\u201d This mythical concept developed by the sports drink industry during the late 1980s was designed to increase the consumption of sports drinks.<\/p>\n<p>Heatstroke and indeed all heat illnesses are unrelated to measures of fluid balance. Weight loss during exercise includes the weight lost due to the irreversible oxidation of fuels. Moreover, fluid loss during exercise has only a marginal effect on the core body temperature during exercise. \u00a0Thus the third answer, \u00a0is the only correct answer.<\/p>\n<p>Interestingly, the small rise in body temperature that occurs with \u201cdehydration\u201d is a biological adaptation found in many desert dwelling mammals. Two to three million years ago our evolutionary ancestors developed this adaptation on the arid plains of South and East Africa. When there is inadequate fluid for ingestion,\u00a0slightly\u00a0raising the body temperature during exercise in the heat increases\u00a0these mammals capacity to lose heat without requiring increased sweating. Hence, it is a water-conserving adaptation. \u00a0All these mammals could increase their sweat rates to lower their body temperatures, but their brains\u2019 chose not to do this. This shows that this adaptation is:<\/p>\n<ol>\n<li>A biological adaptation of value and;<\/li>\n<li>Is not simply due to a \u201cfailure of sweating\u201d caused by \u201cdehydration\u201d.<\/li>\n<\/ol>\n<p>The latter was naturally the interpretation used by advocates of the \u201cScience of Hydration\u201d further to advance the commercial success of the sports drink industry.<br \/>\nThese ideas are covered in my two books, <a href=\"http:\/\/www.randomstruik.co.za\/title-page.php?titleID=4361&amp;imprintID=0\" target=\"_blank\"><em>Challenging Beliefs<\/em> (Struik\/Random House, 2nd Edition, 2012)<\/a> and <a href=\"http:\/\/www.humankinetics.com\/products\/all-products\/waterlogged\" target=\"_blank\"><em>Waterlogged<\/em> (Human Kinetics, 2012)<\/a>.<\/p>\n<p>*November&#8217;s BJSM carried this <a href=\"http:\/\/bjsm.bmj.com\/content\/45\/14\/1157.full?sid=4a17d4b8-805a-4653-b133-f2c22922398chttp:\/\/\" target=\"_blank\">key review by well known US primary care physicians Chad Asplund and Professor Fran O&#8217;Connor along with Tim Noakes<\/a>.<\/p>\n<p><strong>Related BJSM Blogs<\/strong><\/p>\n<p><a title=\"Permanent Link: EVIDENCE-BASED considerations for the Prevention of Heat related illness in Marathon Training (part 1)\" href=\"https:\/\/blogs.bmj.com\/bjsm\/2011\/03\/24\/evidence-based-considerations-for-the-prevention-of-heat-related-illness-in-marathon-training-part-1\/\" rel=\"bookmark\">EVIDENCE-BASED considerations for the Prevention of Heat related illness in Marathon Training (part 1)<\/a><\/p>\n<p><a title=\"Permanent Link to EVIDENCE-BASED considerations for the Prevention of Heat related illness in Marathon Training (part 2)\" href=\"https:\/\/blogs.bmj.com\/bjsm\/2011\/03\/25\/evidence-based-considerations-for-the-prevention-of-heat-related-illness-in-marathon-training-part-2\/\" rel=\"bookmark\">EVIDENCE-BASED considerations for the Prevention of Heat related illness in Marathon Training (part 2)<\/a><\/p>\n<p>**************************************************************<\/p>\n<p><strong><em>Dr. Timothy Noakes<\/em><\/strong><em> is a Sports Physician, Exercise Physiologist and Discovery Health Professor of Exercise and Sports Science at the University of Cape Town and Sports Science Institute of South Africa.<\/em><!--TrendMD v2.4.8--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>BJSM reader poll results By Tim Noakes Only 12% of the BJSM readers who answered the poll were correct &#8211; this speaks to the power of the prevailing dogma and marketing messages. Readers have clearly been influenced by the \u201cScience of Hydration.\u201d This mythical concept developed by the sports drink industry during the late 1980s [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/blogs.bmj.com\/bjsm\/2012\/03\/21\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[173,1,188,187],"tags":[2509],"class_list":["post-2624","post","type-post","status-publish","format-standard","hentry","category-debates","category-uncategorized","category-guest-posts","category-hot-topic","tag-dehydration"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Persistent dehydration MYTHS: Prof Tim Noakes comments on BJSM&#039;s reader poll  - BJSM blog - social media&#039;s leading SEM voice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.bmj.com\/bjsm\/2012\/03\/21\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Persistent dehydration MYTHS: Prof Tim Noakes comments on BJSM&#039;s reader poll  - BJSM blog - social media&#039;s leading SEM voice\" \/>\n<meta property=\"og:description\" content=\"BJSM reader poll results By Tim Noakes Only 12% of the BJSM readers who answered the poll were correct &#8211; this speaks to the power of the prevailing dogma and marketing messages. Readers have clearly been influenced by the \u201cScience of Hydration.\u201d This mythical concept developed by the sports drink industry during the late 1980s [...]Read More...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.bmj.com\/bjsm\/2012\/03\/21\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\/\" \/>\n<meta property=\"og:site_name\" content=\"BJSM blog - social media&#039;s leading SEM voice\" \/>\n<meta property=\"article:published_time\" content=\"2012-03-21T04:20:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2012-03-21T07:10:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.bmj.com\/bjsm\/files\/2012\/03\/dehydration-pie_revised.jpg\" \/>\n<meta name=\"author\" content=\"BMJ\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"BMJ\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/2012\\\/03\\\/21\\\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/2012\\\/03\\\/21\\\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\\\/\"},\"author\":{\"name\":\"BMJ\",\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/#\\\/schema\\\/person\\\/ba3da426ed20e8f1d933ca367d8216fe\"},\"headline\":\"Persistent dehydration MYTHS: Prof Tim Noakes comments on BJSM&#8217;s reader poll\",\"datePublished\":\"2012-03-21T04:20:04+00:00\",\"dateModified\":\"2012-03-21T07:10:09+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/2012\\\/03\\\/21\\\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\\\/\"},\"wordCount\":379,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/2012\\\/03\\\/21\\\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/files\\\/2012\\\/03\\\/dehydration-pie_revised.jpg\",\"keywords\":[\"dehydration\"],\"articleSection\":[\"Debates\",\"General\",\"Guest Posts\",\"Hot Topic\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/2012\\\/03\\\/21\\\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/2012\\\/03\\\/21\\\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\\\/\",\"url\":\"https:\\\/\\\/blogs.bmj.com\\\/bjsm\\\/2012\\\/03\\\/21\\\/persistent-dehydration-myths-tim-noakes-comments-on-bjsms-reader-poll\\\/\",\"name\":\"Persistent dehydration MYTHS: Prof Tim Noakes comments on BJSM's reader poll - 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