The purpose of the study was to find out the effect of interval running and swimming activities on selected biochemical variables. Thirty male teachers aged between 35 and 40 years who knows swimming were selected for the study. They were divided into three equal groups, each group consisted of ten subjects in which Group I underwent interval running activity and group II underwent interval swimming activity, three days per week for twelve weeks and group III acted as control, who did not participate in any training. The subjects were tested on selected criterion variables such as total cholesterol, triglycerides and high -density lipoprotein, at prior to and immediately after the training period. The selected criterion variables, such as, total cholesterol, triglycerides and high density lipoproteins were assessed by using Boehringer Mannheim kit method. The analysis of covariance (ANCOVA) was used to find out the significant differences if any, between the experimental groups and control group on selected criterion variables separately. Since, three groups were involved in the present study, the Scheffé S was used as post-hoc test. The results of the study showed that the selected criterion variables such as total cholesterol and triglycerides were decreased significantly and high-density lipoprotein was increased significantly for both the training groups when compared with the control group. Moreover, the result of the study also shown that there was no significant difference was occurred between the training groups on selected criterion variables such as, total cholesterol, triglycerides and high density lipoproteins.
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