Tom Ramcigam (magicmarmot) wrote,
Tom Ramcigam
magicmarmot

Probably boring health stuff

I got a new bathroom scale about a week ago. I've been logging my weight daily based on the numbers from the scale, primarily because it's there and I want to have a lot of data points to deal with.

I'm keeping a sort of "health log" which contains my blood glucose readings, weight, and other information as I add it. It's basically an excel spreadsheet, but I'm looking at changing the format a bit to make the information more accessible.

The actual numbers are less important than the trends, at least for now. I love Excel's graphing feature, which gives me a handy visual of the trends. However, I'll probably want something more sophisticated as I start to gather more data, so I'll probably end up writing either some number-crunching applets or learn how to write Excel script macros.

I just started out with recording blood glucose levels. I originally started four times a day, but sometimes there were fewer. I'm down to about twice a day now, once in the morning (waking) and once after I get home from work before dinner.

There is a consistency to the numbers: the later numbers are always lower, which makes sense because the medication is more effective during the day since I take it in the morning.

I do the daily weight measurement in the morning as well to try and get a consistent sample time.

I've been just recording all of this linearly, but I think that I'm going to change it to row-daily, which means that each day will have a variable number of blood glucose readings. However, I think it will make the analysis of the numbers with the graphing tools a lot easier.

After about a week of weigh-ins, I have a reasonably good idea of what my average weight for the week is, as well as the noise level. And I'm really surprised: the noise level is almost 5 lbs. which works out to something like a 36dB S/N ratio. That's abysmal, really. However, that's also affected by things like how I stand on the scale, temperature, humidity, and so on (aside from my actual weight fluctuations).

What it means is that I need to do a relatively large-order decimation for the data to show accurate trends. For instance, the blood glucose track is usually a 14-day, 30-day, and 45-day track, but it's more of a windowed average (because it's simpler). Weight is very often taken on a weekly basis, but for trend analysis, an 8-week figure is pretty common.

Decimation is a relatively common tool used in signal processing. Your CD player uses it all the time-- it's the digital filter that makes your CDs sound good. It's tied to oversampling, and is primarily used as a low-pass filter to get rid of high-frequency noise.

I think I talked about this once before. I'll spare the details. The idea is that I can do weekly averages, but the data allows me to shift from a Sunday-to-Saturday week to a Wednesday-to-Tuesday week at will, and to shuffle the window around as needed. I can also make it larger or smaller as needed to filter out fluctuations as I start to see the data.

Wow, that was boring.
Subscribe

  • (no subject)

    Why is my dream life so much cooler than my real life?

  • (no subject)

    I had designed a model plane out of styrofoam, it seemed to be a design for someone. He came to look at the work-in-progress, but decided to actually…

  • (no subject)

    Woke up this morning supercranky, angry at life the universe and everything. Wallowed for a bit, then hopped back into bed for cuddle time with the…

  • Post a new comment

    Error

    default userpic

    Your reply will be screened

    Your IP address will be recorded 

    When you submit the form an invisible reCAPTCHA check will be performed.
    You must follow the Privacy Policy and Google Terms of use.
  • 1 comment