Do Dynamic Fat and Fat-free Mass Changes follow Theoretical Driven Rules in Athletes?.

Introduction: Maximizing fat mass (FM) loss while preserving or increasing fat-free mass (FFM) is a central goal for athletic performance but the composition of body weight (BW) changes over time with training are largely unknown. Purpose: We aimed to analyze FM and FFM contributions to BW changes and to test if these contributions follow established rules and predictions over one athletic season. Methods: 70 athletes (42 males; handball, volleyball, basketball, triathlon, and swimming) were evaluated from the beginning to the competitive stage of the season and were empirically divided into those who lost (n=20) or gained >1.5% BW (n=50). FM and FFM were evaluated with a four-compartment model. Energy densities (ED) of 1.0 kcal.g-1 for FFM and 9.5 kcal.g-1 for FM were used to calculate ED/kg BW change. Results: Athletes that lost >1.5% BW decreased FM by 1.7+/-1.6 kg (p1.5% BW increased FFM by 2.3+/-2.1 kg (p

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