Although the changes in weight were not different between line and nonline positions, there were differences in the amount of weight lost by seniority grouping. Upperclassmen lost more weight than underclassmen (Table 3). When grouped as starters and nonstarters, both groups had significant decreases in weight (21.7 [23.0, 20.4] kg and 21.1
[22.1, 20.2] kg, starters and nonstarters, respectively), but there was no difference between the groups. There was an interaction between player position and seniority for changes in whole-body lean mass (p , 0.01) shown in Figure 1A. The figure shows that in nonline positions, upperclassmen lost more lean mass than underclassmen. The opposite was seen in line positions with the underclassmen losing more lean mass than upperclassmen. The interaction between position and seniority for fat mass also was significant (p = 0.04) and is shown in Figure 2. Underclassmen playing line positions had a significant gain of 2.3 kg of fat mass, whereas other players did not show a change in fat mass.