The purpose of the study was to find out the effect of various intensities of interval training on selected speed and endurance parameters such as speed and cardio respiratory endurance To achieve this purpose of the study, forty five men students studying bachelor's degree in the Department of Physical Education and Sports Sciences, Annamalai University, Annamalai nagar, Tamil Nadu, India were selected as subjects at random. The age of the subjects were ranged from 18 to 20 years. The selected

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... subjects were divided into three equal groups of fifteen subjects each, such as high intensity interval training group (Group I), low intensity interval training group (Group II) and control group (Group III). The high intensity interval training group (Group I) and low intensity interval training group (Group II) underwent their respective training programme for three days per week for twelve weeks. Group III acted as control in which they did not undergo any special training programme apart from their regular physical education programme. All the subjects of two groups were tested on selected criterion variable such as speed and cardio respiratory endurance at prior to and immediately after the training programme by using 50 mts run and Coopers 12 min run/walk test respectively. The analysis of covariance (ANCOVA) was used to analysis the significant difference, if any in-between the groups. The level of significant to test the 'F' ratio obtained by the analyses of covariance was tested at .05 level of confidence, which was considered as an appropriate. The results of the study revealed that there was a significant difference between high intensity interval training group, low intensity interval training group and control group on selected speed and endurance parameters such as speed and cardio respiratory endurance. Significant improvements on selected criterion variables were also noticed due to high and low intensity interval trainings.