Krg bod pod february2014
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Transcript of Krg bod pod february2014
Bod PodDoes beverage consumption affect results?
Sophia Fong, Megan Magiera, Dinh Nguyen, Shawn Rigdon
IntroductionBody composition testing
•the 2-compartment modelo fat mass = 0.9 grams per cm3
o fat-free mass = 1.10 grams per cm3
•Siri equation:%fat = (495/density) - 450
How does the Bod Pod work?
● Air Displacement Plethysmograph (ADP)○ Density= Mass/Volume○ Weigh subject → mass○ Volume-Pressure changes
in chamber → measure pressure → derive subject volume● Must account for:
○ Average thoracic lung volume○ effect of skin surface area
Image from:http://floridafitnesstesting.com/index.php/qaa.html
Recommended Protocol
● No food or drink within 2 hours of testing
● No vigorous exercise within 2 hours of testing
● Appropriate attire should be as close to bare skin as possible○ Wear swim cap○ Form-fitting swimsuit○ Compression shorts○ Unpadded sports bra○ Remove all other clothing, jewelry, etc.
Hypothesis
• We expected body % fat, volume, and mass to increase while density to decrease due to body absorption of 32 ounces of Gatorade.
Methods• 6 Total Participants: 3 Males and 3 Females
• Age range: 21 - 33
• 2 Tests per participants were collected. Pre-Gatorade and post-Gatorade.
• Pre-Gatorade: Follow recommended protocol:
No food or drinks were to be consumed at least 2 hours before the
• Post-Gatorade: Approximately 16 ounces of Gatorade to be consumed within 5 minutes and another 16 ounces within the next 5 minutes. Wait 25 minutes, then re-test.
Results• With the exception of 2 outliers body % fat, volume,
and mass increased while density decreased (due to density being inversely proportional to volume D=M/V).
• No statistical significance was found (p=0.4)
Results
Results
Results
• 2 Female subjects’ body % fat, volume, and mass decreased while density increased.
Conclusion• Most subjects’ body composition readings POST
Gatorade were what was expected.
• 2 outliers’ body composition readings were the opposite of what was expected.
• Validity of BodPod?o 4 compartment vs 2 compartment models
fat mass, total body water, bone mineral mass, residual
up to 3.5% difference (Withers, R.T. et al, 1998)