Table 1.

Body weight and food chow consumption during training

	Paired	Unpaired
Body weight (g)
At start of training	268±4	265±3
At end of training	360±6	351±6
At start of testing	384±6	369±7
At end of testing	402±8	385±8
Food chow consumption (g)
Post-session 1	4.0±1.3	5.1±0.8
Post-session 2	4.9±0.6	4.6±0.5
Post-session 3	5.4±0.7	4.8±0.5
Post-session 4	3.9±0.9	4.5±0.8
Post-session 5	5.6±0.4	5.1±0.5
Post-session 6	5.6±0.7	4.9±0.4
Post-session 7	8.3±1.4	7.9±1.0
Post-session 8	5.0±0.5	5.5±0.6

There was no difference in body weight (mean±S.E.M. g) during training and testing between rats in the paired and unpaired groups. Food chow consumption in home cages after each training sessions was similar for rats in paired and unpaired groups.