Folks at MIT came up with a way to measure the walking speed accurately enough for medical purpose. Apparently the walking speed is an indicator of various medical conditions and they wanted a way to measure it accurately enough without having to instrument the patients. They claim that it is more accurate than fitbit. I'd agree: fitbit will give you steps you've taken each minute, but does not give you the instantaneous reading or running average. I was going to write an app, but an app requires that you have your smart phone all the time. You can't spontaneously measure your walking speed that way.
Anyway, the walking speed closely correlates the fatigue as I have noted last year. And being able to measure the speed automatically while you amble about at home would be the perfect solution for measuring fatigue.
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