tag:blogger.com,1999:blog-1564958057737541664.post2367197223792136116..comments2024-02-14T17:11:22.168-08:00Comments on On Bicycles, and.... what else is there?: height vs mass for sub-27 minute 10 km timesdjconnelhttp://www.blogger.com/profile/01484858820878605035noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-1564958057737541664.post-73763066237105362292010-05-06T10:13:51.529-07:002010-05-06T10:13:51.529-07:00In the weightweenies blog, someone pointed out an ...In <a href="http://weightweenies.starbike.com/forum/viewtopic.php?f=8&t=72545&p=643349#p643349" rel="nofollow">the weightweenies blog</a>, someone pointed out an alternative explanation for the relative lack of tall big guys in the data is that tall, big, fast guys are snatched up by football and basketball, for example, and therefore never train specifically for the 10 km. I like it.djconnelhttps://www.blogger.com/profile/01484858820878605035noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-61422635516322262282010-05-05T09:13:56.589-07:002010-05-05T09:13:56.589-07:00Chris is the outlier, yes. Although on a BMI basi...Chris is the outlier, yes. Although on a BMI basis, he's not the highest.<br /><br />Constant BMI implies mass is proportional to the square of height, while constant ratio implies the mass is simply proportional to height. Across typical populations, mass scales somewhat stronger with height than the square (modeling a human as a sphere of sea water, as we did in undergraduate physics, it would be the cube of height, but reality is taller people aren't as wide for their height as short people: organs need only so much room).<br /><br />So the result is taller runners tend to be extremely thin to go the same speed as shorter runners. Chris is an obvious exception.djconnelhttps://www.blogger.com/profile/01484858820878605035noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-51638474724889845172010-05-05T08:48:09.346-07:002010-05-05T08:48:09.346-07:00also, I am assuming chris is the outlier on the up...also, I am assuming chris is the outlier on the upper right of your graph-- is this correct (sorry, can't convert from english to metric at this early hour)?NadiaMachttps://www.blogger.com/profile/02968728947175573760noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-58902359848222434922010-05-05T08:46:18.433-07:002010-05-05T08:46:18.433-07:00what do you mean by constant ratio? help out the ...what do you mean by constant ratio? help out the math illiterateNadiaMachttps://www.blogger.com/profile/02968728947175573760noreply@blogger.com