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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Remind me, someone. Why are we all buying oximeters? I thought the burden of the Times article was that IF you are sick from a “cold”, don’t wait to test your O2 levels until you EXPERIENCE difficulty breathing, because by then it might be too late. Do you all have colds? I suppose, given that it takes Amazon six weeks to get one, you are wise to get a jump on it. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Nick <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Nicholas Thompson<o:p></o:p></p><p class=MsoNormal>Emeritus Professor of Ethology and Psychology<o:p></o:p></p><p class=MsoNormal>Clark University<o:p></o:p></p><p class=MsoNormal><a href="mailto:ThompNickSon2@gmail.com"><span style='color:#0563C1'>ThompNickSon2@gmail.com</span></a><o:p></o:p></p><p class=MsoNormal><a href="https://wordpress.clarku.edu/nthompson/"><span style='color:#0563C1'>https://wordpress.clarku.edu/nthompson/</span></a><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Friam <friam-bounces@redfish.com> <b>On Behalf Of </b>Roger Critchlow<br><b>Sent:</b> Friday, April 24, 2020 9:40 AM<br><b>To:</b> The Friday Morning Applied Complexity Coffee Group <friam@redfish.com><br><b>Subject:</b> Re: [FRIAM] New information on COVID-19<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Thu, Apr 23, 2020 at 8:32 PM Roger Critchlow <<a href="mailto:rec@elf.org">rec@elf.org</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I wonder if any of those cell phone pulsimeters could be upgraded to oximeters with some calibration?<o:p></o:p></p></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>There are a bunch of cell phone pulse oximeter apps that use the cell phone flash and camera, but I don't get the feeling that they've been calibrated much. It's a lot easier to write the code, call it entertainment, and reap the ad revenues that to actually determine what the measurement means in the general population. Some apps have even added some of the other pulse oximeter functions, perfusion, respiratory pleth, Then, again, <a href="https://www.ncbi.nlm.nih.gov/pubmed/2921597">https://www.ncbi.nlm.nih.gov/pubmed/2921597</a> says "<span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Smartphone-based pulse oximetry is not inferior to standard pulse oximetry in pediatric patients without hypoxia. Reliability was superior for PBA compared with CBA, with more precise agreement for the PBA compared with the CBA. Future studies should test pulse oximetry apps in a hypoxic pediatric population." That was published in 2018.</span><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>There's an interesting series of press releases from UIUC claiming that measuring someone's gait (with cellphone accelerometers) over a 6 minute walk is enough to get a good estimate of O_2 saturation, because people who aren't getting enough O_2 apparently walk funny.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Here's an android app on github, <a href="https://github.com/YahyaOdeh/HealthWatcher">https://github.com/YahyaOdeh/HealthWatcher</a>, with some more method references, the <a href="https://github.com/topics/spo2">https://github.com/topics/spo2</a> listing has a bunch of arduino projects, too.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>-- rec --<o:p></o:p></p></div></div></div></div></body></html>