BME100 f2014:Group1 L3

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Owwnotebook icon.png BME 100 Fall 2014 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: Hawley Helmbrecht
Name: Sarah Fakhoury
Name: Prerna Gupta
Name: Jonathan Riecker
Name: Michael Pineda
Name: Timothy Black


Descriptive Statistics



Gold Standard

Mean: 97.6

Standard Deviation: 0.799

Standard Error: 0.0571


Mean: 102.7

Standard Deviation: 3.11

Standard Error: 0.239


Gold Standard

Mean: 97.527

Standard Deviation: 0.860

Standard Error: 0.0438


Mean: 104.39

Standard Deviation: 3.015

Standard Error: 0.146

Cooling Down

Gold Standard

Mean: 97.947

Standard Deviation: 0.778

Standard Error: 0.0606


Mean: 103.1

Standard Deviation: 1.85

Standard Error: 0.158

Heart Rate

Pre Walk

Gold Standard

Mean: 79.2

Standard Deviation: 13.0

Standard Error: 1.01


Mean: 81.0

Standard Deviation: 15.0

Stand Error: 13.0


Gold Standard

Mean: 101

Standard Deviation: 21.0

Standard Error: 1.01


Mean: 101.0

Standard Deviation: 21.0

Standard Error: 1.11

Post Walk

Gold Standard

Mean: 84.0

Standard Deviation: 18.0

Standard Error: 0.906


Mean: 84.0

Standard Deviation: 17.0

Standard Error: 0.898


Average's graphs for Temperature and Heart Rate

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The golden standards mentioned in these graphs are as follows:

Temperature: An Oral Thermometer

Heart Rate: The Pulse Oxidation Wrist Monitor

Stars denote significance, four stars being very significant, one star denoting a low significance,

no stars denotes no significant difference

Pearson's R Correlation Graphs

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A paired T-test was used because the comparison was between two groups of related data.

T-Test: Temperature

Before Walk (p-value): 5.86082E-46

During Walk (p-value): 2.7657E-155

Cool Down (p-value): 1.98512E-63

T-Test: Heart Rate

Before Walk (p-value):.203015

During Walk (p-value):0.735103

Cool Down (p-value):0.548900

Pearson's R Values

Heart Rate

Before Walk: 0.87175

During Walk: 0.89894

Cool Down: 0.94012


Before Walk: 0.120901

During Walk: 0.034639

Cool Down: -0.173197


Possible Improvements:

Some design flaws on the Spree fitness headband include the temperature scale on the app, the design of the headband itself, and the range of the sensor. Recommendations to compensate for these design flaws include creating a sensor to accurately read temperature and instead of the current scale based off a qualitative range. In order to improve the design of the headband itself, the material of the headband could be changed in order to better absorb sweat and make the headband more attractive, instead of a removable block sensors the sensors could be embedded across the headband for more accurate readings, the shape could be changed for a more aesthetic appeal, and different sizes of the headband could be made available for a better fit among customers. Another way to improve customer satisfaction would be to create a universal app that allows both android and iphone users to utilize this health utility. A final way to improve the Spree headband would be to design the sensors in the headband so that they can store data and not always have to be within range of the phone.


Target Population and Need

Target Population

The target population of the Insight Contacts is active individuals whom spend time in sunlight.


The eye is very sensitive to ultraviolet rays from the sun. People take care of their skin with sunscreen, but often the eye itself is still unprotected. So the Insight Contacts adjust color to give the eye protection from harsh light. Many people that spend time in the sun also have problems with hydration. The need is for a hydration monitoring device that is not obtrusive or easy for someone to do at home. The Insight Contacts will have a sensor that tests for sodium levels so that a part of the contact will change color when its user is reaching unsafe hydration levels.

Device Design

Our Product

Product Name: Insight Contacts

Product Slogan: "Looking Towards a Brighter Future"

Product Logo:

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Description: The Insight Contacts is more than just a contact. It is designed for athletes or basically anyone who spends most of their time outside. It includes sensors that detect the UV rays and adjust the contact lens accordingly so it protects damaging your eyes. It also has the ability to detect dehydration by sensing the amount of sodium in your tear duct area and analyzing it for its concentration. If the concentration is high enough, the contact lens will turn red towards the bottom of the eye signaling that you are dehydrated.

Inferential Statistics

Dehydration Measurements

Gold Standard: Sodium Levels Measured by Blood Test

No Activity

Average: 140.1 mEq/L

Standard Deviation: 11.8

Standard Error: 1.20

At Least Two Hours of Physical Activity

Average: 151.3 mEq/L

Standard Deviation: 12.0

Standard Error: 1.22

Insight Contacts

No Activity

Average: 142.8 mEq/L

Standard Deviation: 8.45

Standard Error: 0.86

At least two hours of Activity

Average: 153.0 mEq/L

Standard Deviation: 9.03

Standard Error: 0.923

Pearson's R Correlation between Gold Standard and Insight Contacts

No Activity: 0.85

At least two hours of activity: 0.765

Paired Two Tailed T-Test: P-Value

No Activity: 0.0796

At Least Two Hours of Activity: 0.0273

UV-Light Measurements

Gold Standard Using UV Index

During Night Time

Average: 0.165 mW/cm^2

Standard Deviation: 0.0554

Standard Error: 0.00554

During Day Time

Average: 1.700 mW/cm^2

Standard Deviation: 0.400

Standard Error: 0.0400

Going from Outside to Inside

Average: 1.19 mW/cm^2

Standard Deviation: 0.701

Standard Error:0.0701

Insight Contacts

During Night Time

Average: 0.166 mW/cm^2

Standard Deviation: 0.0554

Standard Error: 0.00554

During Day Time

Average: 1.70 mW/cm^2

Standard Deviation: 0.394

Standard Error: 0.0394

Going from Outside to Inside

Average: 1.18 mW/cm^2

Standard Deviation: 0.700

Standard Error: 0.0700

Pearson's R Correlation for Gold Standard vs. Insight Contacts

During Night: 0.983

During Day: 0.9995

Going from Inside to Outside : 0.9900

Paired Two Tailed T-test: P-Value

During Night Time: 0.290

During Day Time: 0.261

Going between Inside and Outside: 0.393


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  • ns stands for no significant difference