doi:10.1249/01.mss.0000486656.18600.e8engLozano-Berges, G.Matute-Llorente, A.Gomez-Bruton, A.Marin-Puyalto, J.Gonzalez-Aguero, A.Vicente-Rodriguez, G.Casajus, J.A.A New Specific Equation for the Assessment of Body Fat Percentage in Adolescent Soccer PlayersART-2016-106183PURPOSE: To determine whether the commonly used anthropometric equations or a new developed specific anthropometric equation are adequate to estimate body-fat percentage (BF%) in adolescent soccer players. METHODS: Ninety-eight players (65 males/33 females; 13.4 ± 0.6 years) from different Spanish soccer clubs participated in the present study. Following the recommendations of the International Society of the Advancement of Kinanthropometry (ISAK), biceps, triceps, subscapular, supraspinale, iliac-crest, abdominal, front thigh and medial calf skinfolds were measured and inserted in the following prediction equations to estimate BF%: Johnston et al., Slaughter et al., Carter et al., Faulkner et al. and Deurenberg et al. Dual energy X-ray absorptiometry (DXA) was used as a reference method to evaluate BF%. Several 2-paired samples t-test were used to compare BF% from DXA and the different equations. The validity and presence of heteroscedasticity of these equations was assessed by Bland-Altman analyses. Stepwise linear-regression was used to develop the soccer-specific equation. A cross-validation for the new anthropometric equation was performed using Stein´s equation. RESULTS: The developed equation resulted as follows: %BF = 11.115 + 0.775*(triceps skinfold) + 0.193*(iliac-crest skinfold) - 1.606*(sex; being sex=0 for female and sex=1 for male). The present study showed that Johnston et al. equation was the only one without differences with DXA, but with tendency towards heteroscedasticity. However, the proposed equation demonstrated high cross-validation prediction power (R2=0.85). CONCLUSIONS: The specific equation developed in the present study may be the most appropriate for estimating BF% in adolescent soccer players.2016http://zaguan.unizar.es/record/16390610.1249/01.mss.0000486656.18600.e8http://zaguan.unizar.es/record/163906oai:zaguan.unizar.es:163906Medicine and science in sports and exercise 48, 5 (2016), 551All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess