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Aim. The interaction between running, stretching and prac tice jumps during warm-up for jumping tests has not been investigated. The purpose ofthe present study was to compare the effects of running, static stretching of the leg extensors and practice jumps on explosive force production and jumping per formance.

Methods. Sixteen volunteers (13 male and 3 female) partici pated in five different warm-ups in a randomised order prior to the performance of two jumping tests. The warm-ups were control, 4 min run, static stretch, run+ stretch, and run+ stretch+ practice jumps. After a 2 min rest, a concentric jump and a drop jump were performed, which yielded 6 variables expressing fast force production and jumping performance of the leg extensor muscles (concentric jump height, peak force, rate of force developed, drop jump height, contact time and height/time).

Results. Generally the stretching warm-up produced the lowest values and the run or run+ stretch+ jumps warm-ups pro duced the higbest values of explosive force production. There were no significant differences (p< O. 05) between the control and run+ stretch warm-ups, whereas the run yielded signifi cantly better scores than the run+ stretch warm-up for drop jump height (3.2%), concentric jump height (3.4%) and peak concentric force (2.7%) and rate of force developed (15.4%). Conclusion. The results indicated that submaximum running and practice jumps had a positive effect whereas static stretching had a negative influence on explosive force and jumping performance. It was suggested that an alternative for static stretching should be considered in warm-ups prior to power activities.