Ladson's MedHelp Blogs https://www.medhelp.org/user_journals/show/573157 Medical communities and forums staffed by doctors from leading medical centers. Over 325 forums and communities providing medical information and medical help. en Physical fitness 1. When intensity levels are too high and oxygen is not being delivered to the muscles at a fast en Ladson Mon, 28 Jul 2008 09:12:50 -0500 https://www.medhelp.org/user_journals/show/19005/Physical-fitness https://www.medhelp.org/user_journals/show/19005/Physical-fitness