BME100 f2015:Group4 8amL3

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Owwnotebook icon.png BME 100 Fall 2015 Home
Lab Write-Up 1 | Lab Write-Up 2 | Lab Write-Up 3
Lab Write-Up 4 | Lab Write-Up 5 | Lab Write-Up 6
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Name: Kendra Starkel
Name: Anastasia Wyatt
Name: Austen Bennett
Name: Drew Higgins
Name: Michael Vietz
Name: Bhavna Ramesh


Descriptive Statistics

Heart Rate Average
Gold Standard: 95.64367816 bpm
Spree Headband: 96.70028818 bpm

Heart Rate Standard Deviation
Gold Standard: 23.01119989 bpm
Spree Headband: 23.41883227 bpm

Heart Rate Standard Error
Gold Standard:1.23353 bpm
Spree Headband:1.257189 bpm

Temperature Average
Gold Standard: 97.26372032 °F
Spree Headband: 98.79310345 °F

Temperature Standard Deviation
Gold Standard: 1.042288709 °F
Spree Headband: 1.19825013 °F

Temperature Standard Error
Gold Standard: 0.0536095465 °F
Spree Headband: 0.0621263752 °F




Inferential Statistics

Heart Rate
A paired t-test was used to compared the average heart rate measured by a pulse oximeter and the Spree Headband. A t-test was used because only two data sets were being compared. Since both sets of data were collected from the same group of people the t-test would be paired rather than unpaired. The p-value from the t-test of the data was 0.097819 and the Pearson's R correlation was 0.886903. Since the p-value was greater than 0.05 there was no significant difference between the gold standard and the Spree Headband for the heart rate readings.

A paired t-test was used to compare the average temperature measured by a thermometer and the Spree Headband. A paired t-test was used because the data collected using both devices was taken from the same group of subjects. The p-value from the t-test of the data was 0.249655713 and the Pearson's R correlation was 6.91x10^-68, which is arbitrarily close to zero. The p-value was greater than 0.05 indicating that there was no significant difference between the gold standard and the Spree Headband for the temperature reading. The p-values for the temperature data and the heart rate data were both greater than zero indicating that there was some positive correlation between the type of device used and the measurement taken.


Design Flaws
There were several design flaws of the Spree Headband that caused it not to be an ideal way to measure heart rate and temperature. First of all, the Spree Headband gives a reading of temperature using a scale of a 1-4. This causes the user to be unaware of their actual body temperature in comparison to this scale. The device should be able to relay the exact body temperature of the user using more advanced technology. Second, the Bluetooth connectivity of the Spree Headband was inconsistent. Throughout the trial period the headband was constantly disconnecting from the application on the smartphone. In order to solve this problem the Spree Headband would need to be in close proximity to the smartphone and the Bluetooth connectivity should be stronger. Another problem of the Spree Headband was the fact that it was aesthetically unflattering. It was quite bulky and after wearing the device for the trial it left an imprint on the subject's forehead due to its tightness and poor placement area. The band could be less bulky and thinner in order to solve this problem. Finally, the Spree Headband seemed to register the temperature changes in the environment rather than the temperature changes of the subject's body. It was only capable of determining the surface temperature of the subject rather than the internal body temperature that the oral thermometer could calculate. In order to solve this problem the sensor in the Spree Headband would need to be more advanced and developed to obtain the accurate values of the body temperature changes.

Design Strengths
The device was very user friendly, it had a long battery life and the heart rate measurements made by the Spree Headband were fairly accurate.


Target Population and Need

Target Population
The device targets active males and females over a variety of ages. The main target audience is between 15-40 years old, but it will be useful for everyone. Anyone who is active and interested in understanding their personal health would be interested in this device.

Many people throughout the world struggle with dehydration during workouts and every day life. It is very difficult to measure dehydration without the use of a device. This device will be able to inform the user of their hydration state along with various other functions. Dehydration is a problem that can be prevented if monitored carefully, which is what this device will be capable of doing.

Device Design

Product Understanding Form


Device Diagram


Inferential Statistics