# BME100 s2015:Group10 12pmL3

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# OUR TEAM

 Name: Joseline Valenzuela Name: Isaac Clouse Name: Itai Kreisler Name: Clayton Nunn Name: Your name Name: Your name

# LAB 3A WRITE-UP

## Descriptive Statistics

The design of this device is quite simple. It is a small black box, around 3cm x 2cm x 1cm, which is slightly curved to fit inside a rubber headband that goes around your forehead. The box has a micro usb port in order to download the data it collects onto your computer, and for charging. The device records the data and sends it to the smartphone it is paired with an displays the results on screen. It gives you heart rate, temperature, elapsed time and a few other readings.

Temperature was calculated in degrees Fahrenheit.

Heart rate was calculated in bpm (beats per minute).

## Results

The experiment showed that the mean of the pulse ox was similar to the mean beats per minute of Spree which were 94.8 and 94.6 bpm, respectively. These values yielded a T-Test value of near 0. Additionally, the correlation coefficient between the gold standard and the Spree temperature was almost nonexistent, at -.07.

## Analysis

Judging by the Pearson's R test between the actual temperature and the temperature the Spree recorded, which was -.07, we can infer that there is virtually no correlation between the temperature recorded by the Spree and the temperature recorded by the thermometer. Since the thermometer is accepted as a gold standard for measuring temperature, it is clear the the Spree is very poor at accurately measuring temperature. With regards to the T-test, we see that there is clearly no statistical difference between the means of the heart rate measurements, which is one thing that the Spree does well. Overall, however, the data shows that there are major flaws in the device's measurement, with regard to accuracy and reliability. The one aspect the device tries to market is not nearly as impressive as it claims.

## Summary/Discussion

The target population for this would be the exercising community and those individuals interesting in becoming more physically active and tracking their progress. Generally, these are young adults and adults. Another requirement for those looking to fully utilize the spree is having a smartphone. Since the technology is linked to a smartphone and processes the data through an app, a person who does not have a smartphone couldn't use the spree. As for the need for a device like this, there are a lot of alternatives than provide similar analysis. The spree, however, claims to measure body temperature, which no other athletic monitor claims to do. There is no apparent clinical need for a device like this, so we have ascertained that it was a technological push that brought the spree into existence. As to whether the spree can accurately measure body temperature, please refer to the results and discussion. Some design flaws of Spree were the temperature reading, bluetooth connectivity and unreliable heart rate. The temperature readings were based on 3 colors, blue, yellow and red. While conducting the experiment, it was noted that the device displayed a higher temperature while the group member was outside, in the heat, even if he was only walking. On the other hand, while he was inside and going up and down stairs, the temperature did not change as drastically. From this, the group concluded that the temperature readings are affected by the outside temperature. The bluetooth disconnected around 6 times in the lapse of 1.5 hours, even if the app device was kept close to the Spree. It was also noted that the heart rate was also affected by the outside environment. It would increase when the member wearing the spree stepped outside, even if he was not changing the speed of his walk. The design of the Spree was uncomfortable due to the heat generated by wrapping it over one's forehead.

These problems could be solved by adding more accurate temperature sensors which could adapt to the temperature where the individual is exercising. For example, the app would ask the user to turn on the spree but not wear it so it could intake the temperature of the environment and calibrate the Spree. For the connectivity issues, it might have to do with the software. Some devices are not compatible with the spree, so that increases the connectivity issues. It does drain plenty of battery from the device running the app because of bluetooth, so that is something to consider. Perhaps the app could take readings from the Spree every 10 min or whatever interval of time the used chooses. This will reduce the battery drained. The Spree would be more comfortable if it was made as a wristband, that way it would increase its aesthetics and make it more appealing. It might also take better readings of the heart rate.

# LAB 3B WRITE-UP

## Device Design

--Itai G. Kreisler 01:16, 4 March 2015 (EST)