Figure 1.

FST (day 1). Each behavior (struggle, immobility, and swim) was observed and timed during three 5-min intervals of a 15-min trial. Each point represents the mean of the time the animals in each group spent in each activity/posture. Ovx control animals spent significantly (P < 0.05) more time struggling than those given estrogen (E2). Virtually none of the E2 animals spent time in immobility, whereas Ovx animals increased their time in immobility as their struggle time decreased. E2 animals spent significantly (P < 0.05) more time swimming than the Ovx controls. In general, Ovx animals displayed considerably more variability in their behaviors, evidenced by greater SEM bars.