Change over training sessions of relationship between locus of control and voluntary heart-rate control.

The present study investigated the effects of locus of control on learning to accelerate and decelerate heart over a number of training sessions. 15 Ss who scored internal in locus of control and 15 who scored external were trained to change their heart rates. Ss were given two training sessions in speeding heart rate and two in slowing heart rate. Results indicated that during the initial training sessions, internals were better able to increase their heart rates than externals; the externals were better able to decrease their heart rates than internals. However, this association diminished to nonsignificance when additional training sessions were provided. These results argue for routinely conducting a number of training sessions to avoid any premature statement of a relationship between personaltiy measures and learned control of heart rate.