2018 Student Research Conference:
31st Annual Student Research Conference

Effects of Exercise and Glycogen Status on DXA and BIA Body Composition Measures


Hannah A. Smiles* and Leah M. Stone
Dr. Brian Snyder, Faculty Mentor

INTRODUCTION: The Dual X-ray Absorptiometry assay (DXA) is considered to be one of the most accurate methods to measure body composition when completed with standard protocol. However, glycogen and hydration status have been known to affect algorithms that determine body composition and are often ignored by practitioners.  PURPOSE: To test the accuracy of DXA and Bioelectrical Impedance prior to and after glycogen depleting and dehydrating exercise. METHODS: Participants’ urine specific gravity, DXA, and 2 methods of BIA were measured before and after a glycogen lowering protocol, strength test, and 5k time trial on a treadmill. RESULTS: Testing showed that there is a significant difference (0.046) between body fat percentage as measured before and after glycogen lowering protocol. CONCLUSION: We believe that body composition measuring algorithms may not compensate for depleted glycogen and hydration status. We believe more research should be done in this area before these body composition measurements are used to conclude about athletes’ body compositions after performance.

Keywords: DXA, Glycogen Depletion , Body Composition, BIA, Hydration, Body Fat Percentage

Topic(s):Exercise Science

Presentation Type: Poster

Session: 5-5
Location: GEO - SUB
Time: 3:30

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