BME100 f2014:Group9 L3

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BME 100 Fall 2014 Home
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Kevin Koza
Phil Liles
Logan Murphy
Cameron Hiller
Tiffany Gong
Evan Targioni


Descriptive Statistics

Temperature values:

Thermometer Spree Thermometer Spree Thermometer Spree
Pre-Walk Trial 97.43640244 101.4634146 0.782410976 2.618858073 0.061283157 0.205124795 164
Walking Trial 97.41580808 104.4292929 0.884035515 3.023903175 0.044480654 0.152149081 396
Cool Down 97.87153374 102.8895706 0.80258752 2.000018819 0.063057231 0.157136319 163

Pulse values:

Pulse-Ox Spree Pulse-Ox Spree Pulse-Ox Spree
Pre-Walk Trial 79.77443609 80.63909774 13.34485291 15.00118094 1.1571455 1.300767354 133
Walking Trial 100.5754986 101.1196581 21.35868838 21.55941785 1.140042446 1.150756593 351
Cool Down 85.10204082 84.14965986 18.02461585 17.2873989 1.486645259 1.42584063 147


Inferential Statistics:

T-Test (P-Value) Pearson's R
Pre-Walk 6.41479E-44 0.088898436
Walking 3.6329E-156 0.026603598
Cool-Down 4.50837E-64 -0.168213517
Pre-Walk 0.183725934 0.867786916
Walking 0.373610275 0.857847479
Cool-Down 0.061933959 0.94041646

A T-test was executed due to how there are only two factors being compared in these trials. The test to determine Pearson's R was executed because it shows whether or not the values in the trials correlate.


In terms of temperature readings, the Spree has an extremely low p-value, which shows that there is a large amount of variation in the reading of the standard and that of the Spree. This shows that it does not produce accurate readings. Also, the value for Pearson's R in this experiment shows that there is no real correlation between the values. However, the values for the heart rate show more accurate readings. The only trial which nearly possesses statistical significance is the post-walk/cooldown, as the p-value is .061. The Pearson's R for these tests are close to 1, so the values do correlate, unlike the temperature.

Description of image Description of image


Since both the p-value is extremely low, and how Pearson's R is close to zero for the temperature readings, it is clear that the Spree is not accurate in its readings. However, the measurements for heart rate are almost accurate, as the p-value for the tests are much closer to .05, and the Pearson's R is near 1. Yet, they are not close enough to hold significance. Overall, the Spree is a flawed device. One major design flaw is that it measures temperature externally, which is unlikely to produce a clear and consistently accurate result.


Target Population and Need

The Swoleband is a new biomedical device which measures heart rate and levels of sodium and lactate (to derive a measure of lactic acid) in sweat. This device is targeted toward athletes, as the information it provides can help measure hydration and fatigue, along with physical exertion. The measure of sodium levels in sweat helps to maintain hydration, as a higher concentration typically means dehydration, which is necessary to avoid. The measurement of lactic acid provides information about how fatigued a person is, and it can help a person avoid overexertion. Also, this measure can be used to show that athletes are not exercising to a nearly full potential, so the device can tell them to keep going.

Device Design


Inferential Statistics


Description of image Description of imageDescription of image

Average Standard Deviation Standard Error
Standard Swoleband Standard Swoleband Standard Swoleband
Heart Rate 93.78 93.37 19.21 18.93 3.70 3.64
Sodium Concentration 28.06 28.15 5.95 5.81 1.19 1.16
Lactate Concentration 22.78 22.82 3.16 3.10 .6599 .6472
T-Test Pearson's R
Heart Rate .2036 .996
Sodium Concentration .506 .994
Lactate Concentration .296 .999

Since the p-values assigned by the t-test are much higher than .05, it shows that the data shows an extremely low difference between the two groups. This means that the device is highly accurate. The Pearson's R coefficient approaches 1, signifying that the data shows correlation.


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