Although the changes in weight were not different between line and non line 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 non line positions, upperclassmen lost more lean mass than underclassmen.