## 3 Results  
Percent playing time for each player is shown in Figure 1. There was a significant difference in percent playing time between the class years (F\({}_{2,13}\) = 6.128, \(p\) = 0.013, \(\eta_{\rm p}\)\({}^{2}\) = 0.485), with first-years having a significantly lower average percent playing time, 26.0 \(\pm\) 22.0%, than sophomores at 63.8 \(\pm\) 5.7% (\(p\) = 0.021), and juniors at 57.3 \(\pm\) 19.1% (\(p\) = 0.028). There was no difference in height between the class years (F\({}_{2,13}\) = 0.236, \(p\) = 0.793, \(\eta_{\rm p}\)\({}^{2}\) = 0.035). Pre season and post season average values of body mass, percent body fat, vertical jump, and Yo-Yo IR1, for each class year are presented in Table 1. There was a significant main effect of session (F\({}_{1,13}\) = 9.640, \(p\) = 0.008, \(\eta_{\rm p}\)\({}^{2}\) = 0.426) and class year (F\({}_{2,13}\) = 92.950, \(p\) < 0.001, \(\eta_{\rm p}\)\({}^{2}\) = 0.935) and a significant interaction effect (F\({}_{2,13}\) = 4.074, \(p\) = 0.042, \(\eta_{\rm p}\)\({}^{2}\) = 0.385) on body mass (Table 1). There was a significant main effect of class year (F\({}_{2,13}\) = 129.665, \(p\) < 0.001, \(\eta_{\rm p}\)\({}^{2}\) = 0.952), but no significant effect of session (F\({}_{1,13}\) = 3.755, \(p\) = 0.075, \(\eta_{\rm p}\)\({}^{2}\) = 0.224) or interaction (F\({}_{2,13}\) = 1.610, \(p\) = 0.237, \(\eta_{\rm p}\)\({}^{2}\) = 0.199) on percent body fat. First-year athletes started the pre season with a lower body mass and percent body fat than sophomores (body mass: \(p\) < 0.001, percent body fat: \(p\) < 0.001) and juniors (body mass: \(p\) < 0.001, percent body fat: \(p\) < 0.001). Additionally, first-year athletes significantly increased their body mass pre to post season (\(p\) = 0.013). The average body mass gain for first-year athletes was 3.03 kg, 0.33 kg for sophomores, and 0.58 kg for juniors from pre to post season. Although each first-year athlete increased their body mass over the season, and all but one increased their percent body fat, the average post season body mass and percent body fat for first-year athletes were still lower than both pre and post season averages of sophomores and juniors. The percent difference in average post season body mass was 9.3% for first-years compared to sophomores and was 4.3% for first-years compared to juniors. The percent difference in percent body fat post season was 14.7% for first-years compared to sophomores and was 13.3% for first-years compared to juniors. Four athletes had slight decreases in their body mass and percent body fat over the course of the season, with a maximum percent decrease of 2.9% for mass and 4.3% for body fat (Figure 2). Each of these players played more than 60% of the time. Figure 1: Percentage of total on field playing time for each athlete, grouped by class year. Vertical jump height for all athletes improved pre to post season an average of 8.9 \(\pm\) 7.0% (F\({}_{1,13}\) = 22.900, \(p\)! 0.001, \(\eta_{\rm p}\)\({}^{2}\) = 0.638). First-year athletes, on average, performed worse on the vertical jump during both the pre and post season compared to sophomores and juniors, though there was no significant main effect of class year (F\({}_{2,13}\) = 2.610, \(p\) = 0.111, \(\eta_{\rm p}\)\({}^{2}\) = 0.287) or interaction effect (F\({}_{2,13}\) = 0.463, \(p\) = 0.639, \(\eta_{\rm p}\)\({}^{2}\) = 0.067) on vertical jump. All but one athlete, a junior, improved or maintained their jump height post season. The largest gains were seen in the sophomores who increased an average of 11.5 \(\pm\) 6.4%, compared to 9.2 \(\pm\) 4.5% for the first-years and 7.2 \(\pm\) 9.0% for the juniors (Figure 3A). The single largest percent change, 25.0%, occurred in a junior athlete. This player also had the largest absolute increase in jump height, 10.2 cm, where she went from having the fifth highest jump pre season to the third highest jump post season.