This study examined population-specific allometric exponents to control for the effect of body mass (BM) on bench press, clean and squat strength measures among Division IA collegiate football athletes. One-repetition maximum data were obtained from a university pre-season football strength assessment (Bench press, n=207, clean, n=88, and Squat n=86) and categorized into three groups by positions (Line, Linebacker, and Skill). Regression diagnostics and correlations of scaled strength data to BM were used to assess the efficacy of the allometric scaling model and contrasted with that of ratio scaling and theoretically based allometric exponents of 0.67 and 0.33. The log linear regression models yielded the following exponents (b): b=0.559, 0.287 and 0.496 for bench press, clean and squat respectively. Correlations between bench press, clean and squat to BM were r=-0.024, -0.047, and -0.018 respectively, suggesting the derived allometric exponents were effective in partialling out the effect of BM on these lifts and removing between-group differences. Conversely, unscaled, ratio-scaled and allometrically scaled (b=0.67 or 0.33) data resulted in significant differences between groups. It is suggested that the exponents derived in the present study be used for allometrically scaling strength measures in NCAA Division IA football athletes. Use of the normative percentile rank scores provide coaches and trainers with a valid means of judging the effectiveness of their training programs by allowing comparisons between individuals without the confounding influence of BM.
Copyright (C) 2014 by the National Strength & Conditioning Association.