Statistical Analyses
For the purpose of data analyses, subjects were grouped according to playing position as per Wilmore and Haskell (28) (offensive linemen/tight ends; defensive linemen; offensive backs/receivers; defensive backs; linebackers; quarterbacks and kickers), ethnicity (white, African American), and years played (1, 2, 3, 4). Sum of skinfolds, skinfold thickness at each of the 8 measurement sites, body density, FFM, and body fat percentage was compared across position group and within each subcategory using analysis of variance techniques (23). Significant pairwise differences were determined using the Scheffe post hoc test. The level of significance was set at p # 0.05 in all instances. All values presented are expressed as mean 6 standard error of the mean.
Statistical Analyses For the purpose of data analyses, subjects were grouped according to playing position as per Wilmore and Haskell (28) (offensive linemen/tight ends; defensive linemen; offensive backs/receivers; defensive backs; linebackers; quarterbacks and kickers), ethnicity (white, African American), and years played (1, 2, 3, 4). Sum of skinfolds, skinfold thickness at each of the 8 measurement sites, body density, FFM, and body fat percentage was compared across position group and within each subcategory using analysis of variance techniques (23). Significant pairwise differences were determined using the Scheffe post hoc test. The level of significance was set at p # 0.05 in all instances. All values presented are expressed as mean 6 standard error of the mean.
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