BME100 f2014:Group26 L3

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OUR TEAM Ambike Bhraguvanshi Timothy Chen Andrew Polson Rachel Ponstein Rebecca Schiavone Jiaqi Wu LAB 3A WRITE-UP Introduction Product design has five main steps: identifying a problem, investigating a solution, designing a prototype, testing, and finalizing the device. The SPREE Headband is a start-up company in the beginning stages of production. The main goal of this lab was to test the effectiveness of the SPREE band versus the gold standard in medicine. The SPREE Band is a device used to measure heart rate and temperature while the user is exercising. To properly measure the effectiveness of the SPREE Band, the gold standard was used to test the heart rate and temperature. Heart rate was measured by taking the pulse of a subject for 15 seconds, then multiplying the number by four to obtain the standard units of beats per minute. Temperature was measured orally by using a thermometer. The purpose of the experiment to is to find whether there is a positive correlation between the measurements on the SPREE Band and the measurements using the gold standard to validate the SPREE Band. Descriptive Statistics bpm = beats per minute Graphing GS = Gold Standard Black line with a star above it = Statistically different sets of data Temperature Heart Rate Inferential Statistics A t-Test is used to compare the results of the Spree Band versus the Gold Standard for measuring heart rate and temperature. The following are the t-Test values for Temperature: The t-Test value for the Indoor Pre-Walk is: 5.52E-54 The t-Test value for the Walk is: 4.581E-241 The t-Test value for the Indoor Cool Down is: 3.9234E-95 The following are the t-Test values for Heart Rate: The t-Test value for the Indoor Pre-Walk is: 0.2969 The t-Test value for the Walk is: 0.44866 The t-Test value for the Indoor Cool Down is: 0.84484 All of the Temperature t-Test values are below 0.05, meaning that they are statistically significant. Because the t-Test values are below 0.05, it means that the SPREE band's sensor for Temperature are very close to the Gold Standard for temperature. However, the Heart Rate t-test values are all above 0.05, meaning that they are statistically insignificant. Compared to the Gold Standard, the SPREE band does not measure the Heart Rate as accurately. The following are the Pearson's r correlation coefficient values for Temperature: The Pearson's r value for the Indoor Pre-Walk is: 0.090288 The Pearson's r value for the Walk is: 0.009997 The Pearson's r value for the Indoor Cool Down is: -0.155259 The following are the Pearson's r correlation coefficient values for Heart Rate: The Pearson's r value for the Indoor Pre-Walk is: -0.010091 The Pearson's r value for the Walk is: 0.133248 The Pearson's r value for the Indoor Cool Down is: 0.219130 Results The t-test values for temperature were significant--as they were below .05--and make using the spree as a workout temperature tracker a viable option, however since it was vastly insignificant in terms of heart rate, it would not be recommended to be used as a heart rate monitor that would be used whilst working out. Changes Made to Raw Data In the raw data, group 22 and group 25 both listed their gold standard measurements of temperature in Celsius. These measurements were converted to Fahrenheit using the conversion factor 1 degree C: 33.8 degrees F. All of the groups used the SPREE Band measurements for temperature. These measurements were converted: 1-97 degrees F, 2-103 degrees F, 3-110 degrees F, 4-116 degrees F. Group 8 and group 26 both used the SPREE Band number scale to measure the heart rate, this number is related to the temperature and therefore inapplicable. The paired data associated with these groups was removed from the data when analyzed. Experimental Errors This experiment had many possible errors. The SPREE Band had connectivity problems, where sometimes the measurement could not be taken at the appropriate time, as the SPREE Band was not currently measuring. The scale of the SPREE Band was a 1 to 4 scale, which had large information gaps and inexact measurements. The SPREE band also measured external body temperature, while the gold standard measured internal body temperature, which could have caused variability between readings. Lab groups 8, 11, and 26, specifically, measured the heart rate on the 1 to 4 scale (unlike the other lab groups) and therefore, had data that was not usable in the overall experiment. Human error was a possibility as well. Lab group 26 did not have a properly working heart rate monitor and had to use the pulse (wrist) as a gold standard. The number of beats could be counted incorrectly, multiplied incorrectly or taken incorrectly, as it is more exact to use a device to measure such things (such as a blood pressure cuff). The timing could have been different as well. For an optimal experiment, the measurements using the SPREE Band and the measurements using the gold standard should have been taken at precisely the same time; there is a possibility that this did not happen. Summary/Discussion The experiment began by gathering all of our supplies (not too long after class began) followed by the set up and syncing of our supplies. Supplies included a heart-rate monitor, thermometer, a Spree-sensor in a head band, and the Spree App. The first flaw encountered, was the provided heart-rate monitor, which turned out to be faulty. The monitor kept turning off and did not read the test-subject's (Andrew's) heart rate. We went through two different monitors, three different TA's, and every single time they were not successful to fix our problem. We spent around twenty-five minutes trying to fix this problem. Our solution was manually measuring Andrew's heart rate by placing the pointer and middle finger on one of the majour veins in his wrist, setting a timer for fifteen seconds, and then multiplying our result by four to get the heart rate per minute. Once we came to the conclusion that measuring Andrew's heart rate would need to be the old fashioned way, we moved on to a much bigger problem. Our next problem was our Spree device and app. This little device was incredibly difficult to sync with the iPhone app, as there were so many other phones and devices in the room (and building) as well. That was problem number one for the Spree device and app. It took us another fifteen to twenty minutes to finally set this device up and be able to take a reading of sorts. Next time, it might be easier to use a device that has either a wire to the phone, or a device that does not have an app and just has a monitor on the headband itself and gives you the data on the little monitor; would be less complex, and quicker. Our iPhone guy (Tim) had to walk around behind Andrew the entire time to maintain a connection, and even then the connection was still lost. Not to mention the fact that the heart rate on the Spree app was from 1-3, each number representing a range of temperatures which are NOT accurate whatsoever, as some people got the number three, which was 110 degrees. If someone has a fever of 110, they need to go to the hospital ASAP for internal burning and a serious infection. LAB 3B WRITE-UP Target Population and Need "Why SPREE? Fitness enthusiasts ourselves, we were unsatisfied with the products on the market claiming to give the most accurate and complete information on our workouts. We tried the heart rate chest straps. We tried the lifestyle wristband trackers, the watches, and the shoe sensors. We even combined them. Even with all of the claims, not one of them included body temperature tracking. We felt it was important to know when our bodies were warmed up and when our bodies were too warm. We wanted to workout smarter, NOT harder." (Home-SPREE) The SPREE Band website markets towards fitness enthusiasts and compares their product with the Nike+ Fuelband SE, Garmin Forerunner 610, and Polar CS600X GPS. The SPREE Band uses fills the void in fitness monitors for headbands. There are many systems that use bracelets or chest straps, but the SPREE Band is unique in its abilities to measure the body's limits using only a headband. It has the ability to measure heart rate, measure temperature, track speed, map GPS route, and do an advanced calorie count. It is also waterproof, has an app and has music app compatibility. The SPREE Band is a multi-faceted device targeted to the fitness-aware individual and fills the need for a device that allows flexibility in movement (not a chest strap) and measure the body's limits to improve the fitness experience. Device Design Design Flaws The device uses a Bluetooth wireless connection to the user's smartphone in order to be read. This connection often disconnected without reason and interacted with other SPREE Bands in the vicinity. The Bluetooth caused reading the SPREE Band readings to be difficult to take. The band itself must be placed on a specific place on the forehead in order to read the heart rate. This makes it less user-friendly. Inferential Statistics Graph Works Cited "Home - SPREE." SPREE. N.p., n.d. Web. 24 Sept. 2014. <http://spreewearables.com/>.