{"id":959,"date":"2010-03-03T20:07:49","date_gmt":"2010-03-04T04:07:49","guid":{"rendered":"https:\/\/www.wkiri.com\/today\/?p=959"},"modified":"2010-03-03T20:10:35","modified_gmt":"2010-03-04T04:10:35","slug":"be-still-my-beating-heart","status":"publish","type":"post","link":"https:\/\/www.wkiri.com\/today\/?p=959","title":{"rendered":"Be still my beating heart"},"content":{"rendered":"

My hotel presented me with the opportunity to collect some data about myself. On Monday, I went down to try out their exercise room and spent a while running on a treadmill (the first time I’ve ever used a hotel’s exercise room!). After a while I noticed that the shiny metal bars on the hand-rail actually were designed to measure and report your heartrate. After playing with this a little, of course I started to wonder how my body’s heartrate responded to the speed at which I was jogging.<\/p>\n

So today when I went down for some exercise, I also took paper and pen with me. Of course what I wanted was for the machine to continuously record timestamps, speed, and heartrate and to deliver a printout to me at the end (or better, just email me the results). But no such luck, so I had to resort to recording it myself. This turned out to be more awkward than I anticipated; I wanted to record heartrate every 30 seconds, but the machine took 15 seconds just to calculate it, and then I had to fumble and write while jogging. Plus, especially at higher heartrates (or jogging speeds, not sure which was the problem), the machine would report garbage that masqueraded as a real heartrate (like suddenly dropping from 120 to 77 bpm). So in the end I had to do some data cleaning, which always makes me uneasy. But I only removed the obvious outliers and left the rest of the noise in.<\/p>\n

The result is surprisingly sensible:
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\nThe heartrate values at about 8-15 minutes are not reliable; the machine kept reading low, and an independent test with my jugular and the wall clock suggested I was closer to 150 bpm at that point. (The 150 bpm point at 20 minutes was also from a hand-measurement.) But still, pretty cool! A bit of hysteresis<\/a>, as you might expect. According to the machine, I burned 196 calories (but it didn’t ask for my weight or mass, so…) and traveled 1.9 miles. And I got to make a graph!<\/p>\n","protected":false},"excerpt":{"rendered":"

My hotel presented me with the opportunity to collect some data about myself. On Monday, I went down to try out their exercise room and spent a while running on a treadmill (the first time I’ve ever used a hotel’s exercise room!). After a while I noticed that the shiny metal bars on the hand-rail […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[33],"tags":[],"_links":{"self":[{"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/posts\/959"}],"collection":[{"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=959"}],"version-history":[{"count":9,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/posts\/959\/revisions"}],"predecessor-version":[{"id":969,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/posts\/959\/revisions\/969"}],"wp:attachment":[{"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}