Acute Exercise And Resulting Dehydration Does Not Alter Body Composition Measures Using Fit3D

Document Type

Conference Presentation

Department

Health, Exercise, and Sport Sciences Department

Conference Title

American College of Sports Medicine - Medicine & Science in Sports & Exercise conference

Organization

American College of Sports Medicine

Location

San Francisco, CA

Date of Presentation

5-29-2020

Journal Publication

Medicine & Science in Sports & Exercise

ISSN

0195-9131

DOI

10.1249/01.mss.0000684964.07852.55

Volume

52

Issue

7S

First Page

869

Abstract

Fit3D is a novel, camera-based system to assess anthropometric measurements and determine body composition. Little data exist on how the values generated by this system may be influenced by acute exercise and associated dehydration and fluid shifts. PURPOSE: To determine the effect of a prolonged bout of acute exercise on the body composition measures generated by the Fit3D. METHODS: 17 subjects (7 female, 10 male) underwent body composition analysis using the Fit3D before and after one hour of acute exercise. The exercise protocol consisted of a maximal treadmill exercise test to volitional fatigue followed by 40 min of continuous exercise at the estimated anaerobic threshold calculated by taking 65% of each subject’s ventilatory threshold. Each subject had their vitals (heart rate, blood pressure, and scale weight) taken, provided a urine sample to measure specific gravity, and performed a Fit3D scan before and after the exercise bout. RESULTS: Subjects lost 2.5±1.8 lbs during exercise. This loss of body water was associated with an increase in urine specific gravity of .007±.004. These changes did not influence any of the circumference measures and only slightly influenced percent body fat measured on the Fit3D. Pre-to-post measures of body fat (24.5±6.9% vs 24.8±6.7%), trunk-to-leg volume ratio (1.45±0.59 vs 1.49±0.56), fat mass (73.4±15.7 vs 72.5±15.6kg), lean mass (54.9±9.9 vs 54.1±10.2 kg), and basal metabolic rate (1637±242 vs 1630±242 cal/day) were not statistically different (p=0.894, 0.876, 0.999, 0.822 and 0.930 respectively). CONCLUSION: Our results provide preliminary evidence that the Fit3D instrument is a consistent tool for assessment of body composition even after a bout of acute exercise resulting in the loss of body water.

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