Table 1.

Model summary showing the results of fitting fixed effects and covariates to the change in running capacity for a panel of 10 inbred rat strains (population 1)

Trait	Model P	R2	Strain P	Sex P	BW1 P	Heritability	SE
DIST1	0.0001	0.33	0.0001	0.0019	0.740	0.14	0.064
DIST2	0.0001	0.51	0.0001	0.0001	0.690	0.29	0.091
ΔDIST	0.0001	0.28	0.0001	0.180	0.980	0.13	0.060
BWT1	0.0001	0.93	0.0001	0.0001	—	0.44	0.112
BWT2	0.0001	0.92	0.0001	0.0001	—	0.43	0.111
Δ BWT	0.0001	0.75	0.0001	0.0001	0.890	0.31	0.093
WORK1	0.0001	0.32	0.0001	0.0110	0.076	0.13	0.060
WORK2	0.0001	0.44	0.0001	0.0012	0.610	0.23	0.082
ΔWORK	0.0001	0.26	0.0003	0.140	0.760	0.11	0.057

Distance run or running capacity (DIST), body weight (BWT), and work carried out (WORK) were all measured before training (¹) and after training (²), and the difference between the before and after measurements was calculated (Δ). The columns of the table are: Model P, probability of the overall fit of the model; R², squared correlation coefficient between data and model; Strain P, probability of strain in the model; Sex P, probability of sex in the model. BW¹ P, probability of starting body weight (BWT¹) in the model.