This study examined the influence of different levels of distance running on percent body fat and serum lipids in untrained male University students (n = 40) with a mean age of 24.1 years. Subjects were assigned randomly to four groups (n = 10) in each group): Group 1 (control), Group 2 (1.6 km joggers), Group 3 (3.2 km joggers) and Group 4 (4.8 km joggers). Subjects in the exercise groups jogged the prescribed distances three times a week for 12 weeks at about 85 percent of maximal heart rate. Percent body fat, serum cholesterol and triglyceride levels were estimated before and after the training programme. In comparison with control group, exercise groups showed statistically significant (p less than .05) decrease of body fat values (1.6 km joggers 6%; 3.2 km joggers 5.33%; 3.2 km joggers 11%; 4.8 km joggers 9.42%). However, Newman-Keul's post hoc analysis showed a significant (p less than .05) reduction in serum triglyceride only in 3.2 km joggers. This was attributed to the high pre-training level of serum triglyceride in the group. Cholesterol values showed insignificant changes. It was concluded that moderate physical activities of different intensities have lowering effects on body fat and serum lipids.
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