The purpose of this study was to find out the effects of plyometric and circuit trainings on selected physiological parameters among college men volleyball players. To achieve the purpose of this study, forty-five men volleyball players studying in the colleges affiliated to the University of Madras, Chennai were selected as subjects and they were divided into three equal groups of fifteen each.  Group I underwent plyometric training, Group II underwent circuit training.  Group I and Group II underwent their respective training programmes for three days per week for twelve weeks and Group III acted as control in which they didn’t undergo any special training programme apart from their daily curricular activities. The selected subjects were tested on the selected criterion variables such as breath holding time and resting pulse rate at prior and immediately after the training programme with holding the breath for time and by taking radial pulse.  The analysis of covariance was used to find out the significant differences, if any, at prior and immediately after the training programme among groups on selected criterion variables separately. Whenever the obtained ‘F’ ratio for adjusted post test was found to be significant, the Scheffe’s test was applied as post hoc test to determine the paired men differences, if any. The level of confidence was fixed at .05 level which was considered as an appropriate. The results of this study showed that there was a significant difference between PTG & CTG, PTG & CG and CTG & CG on BHT and RPR.

KEYWORDS: Plyometric And Circuit Trainings -Physiological Parameters - College Men Volleyball Players.