Activity Tracker Comparison: Fitbit vs. BodyMedia

If you’ve been reading me for awhile, you know I’m a big fan of the BodyBugg/BodyMedia device. It was the original, invented by Astro Teller, grandson of physicist Edward Teller. The BodyMedia armband uses galvanic skin response to monitor skin temperature, skin moisture, and emitted gases. Calorie expenditure was tested to be within 10% accuracy of clinical methods. Before introducing a consumer product, BodyMedia originally provided metabolic assessment services to the healthcare research market.

The BodyMedia armband was originally called a “sensewear device” but the market is now exploding as wearable “activity trackers.” Fitbit, Garmin Vivofit, and the Jawbone UP are easy to wear wristbands or clip-ons. They use the technology introduced in game devices like the Wii; they see your movements in space and apply algorithms.

Activity trackers are projected to be one of the hottest gifts this holiday season. I just picked up a Fitbit “Charge” and I’m pulling out the BodyMedia armband to make a side-by-side activity tracker comparison. I’ll be wearing them both over the next couple of weeks to see how the daily stats compare. Unfortunately, I won’t be able to find out which one is actually closest to clinical results but it will be interesting to see how close the stats are.

Fitbit Charge and BodyMedia armband

Fitbit Charge and BodyMedia armband

The BodyMedia armband tracks calorie burn, steps, and minutes of activity, measured in METs (metabolic equivalents. Click to see my blog post about METs here.) The Fitbit Charge tracks calorie burn, steps, and activity minutes in METs as well but also monitors your sleep and will (sorta) log stairs by number of floors climbed.

Both devices come with their glitches. The BodyMedia counts steps as a heel-toe stride. It has trouble tracking real stairs but does log my stepper. I’ve already observed a quirk of the Fitbit. Yesterday, it credited me with two floors of stairclimbing when I took the escalator to an EL train platform. The Fitbit measures atmospheric pressure to determine a change in elevation. It assumes that average floors are 10′ in height. I don’t see a lot of value in logging floors climbed. I’d rather see steps. I have observed that the Fitbit will log a real stairstep as a step but has trouble with stepper/Stairmaster steps.

Both devices will log every step throughout the day and they can really add up but it takes an increase in energy expenditure to log METs and get credit for “Activity” minutes. The Fitbit Dashboard for checking your stats is well-laid out. You can check it online or your phone. The BodyMedia offers similar dashboards but charges a subscription fee. The fee has prompted a programmer to offer a “FreeBugg” hack so users can stop paying the monthly fees. The BodyMedia has one feature that’s actually my favorite and the Fitbit has a similar function. I set a “Trip” feature to check my stats for a specific time period, great for seeing how many steps and calories I logged for a particular activity.It will show calorie burn per minute which I really like. It’s just the way I like to crunch the numbers. By holding down a button on the Fitbit, it will go into a “stopwatch” mode and show your stats for just that time period. It does not record these stats to the dashboard and does not show calorie burn per minute. The BodyMedia lets you see your day’s stats and “trip” stats; the Fitbit has to be switched back to regular mode.

The Fitbit’s sleep monitoring seems to be a bit buggy. There are a lot of complaints about it on the Fitbit help forum. I’ve slept with the Fitbit for the last three days and it gave me stats on my last two nights. It seems to think I rocked an all-nighter last night. I found no data when I got up this morning.

Both devices will sync and upload stats with a cable or wirelessly. For wireless transmission, the Fitbit uses this USB thingee that will definitely challenge my record of not losing stuff.

Fitbit Charge wireless USB connector

Fitbit Charge wireless USB connector

I’ll be blogging and tweeting my stats in the coming days so check back for my updates on how each of the devices are performing in daily use!


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    • JoAnn on November 16, 2014 at 5:10 pm

    I found Fitbit to be pretty accurate when I remembered to put it into sleep mode. It seemed close on how long it took to fall asleep as well as if I woke up during the night. While there are definitely more or less accurate devices, the biggest thing about activity trackers is that they can spur you to go a little farther or work a little harder.

    1. You’re right, JoAnn! It has always changed my mindset to be focused on what’s going out instead of what’s going in! I’ve always liked it and got the first generation BodyBugg/BodyMedia. When the sleeker model came out, I sold the old one on eBay and got the new one. Jawbone bought BodyMedia and it looks like they’re phasing out the armband style in favor of their own technology. Too bad, I think it’s good to have a choice to go with the contact skin response.

      The “Charge” model I have is supposed to sense your sleep automatically; there’s no sleep mode to put it into. It thought I did not sleep at all the night before and just four hours last night!!! How am I conscious right now???

      Check my tweets for comparisons!

    • Abby on November 17, 2014 at 8:43 am

    I’ve been curious about these devices and thought about buying one several times. I’m curious about the results and wondering about ease of use. I don’t typically get on an actual computer these days so not sure I’d be the best option for me. I’m okay using a simple pedometer for daily use.

    1. Hi Abby!!! Thanks for stopping by!!

      A good pedometer will certainly get the job done, even the fairly simple ones! Fitbit has entry level models that will do a good job of logging all your steps and calorie burn. Best Buy carries all of them. I think they all can sync to your phone with Bluetooth and they have a display, you can just look for instant update. The sync feature is really just to see your stats laid out on a dashboard.

      The one downside of the small Fitbits is they are easy to lose or put in the wash!

    • Carol on December 17, 2014 at 3:20 pm

    Have used BodyBugg since 2008. The most accurate for calorie burn on the market.

    1. I think you’re right! It’s going to be a shame if Jawbone phases out the BodyMedia strap now. Back when those came out, they were tested at within 10% accuracy of clinical methods. I got mine back in BodyBugg days when Apex was selling them and I still love it. Thank goodness for FreetheBugg!

    • Laroia on April 30, 2015 at 12:13 pm

    I have the bodymedia and it also tracks sleep. I only had a problem once with it not tracking my sleep. I like that you can see your calories burned and steps live as your exercising by using the free app on your smart phone or if you have the clip on device. I’ve heard good things about the fitbit but they don’t seem very different.

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