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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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Young W. 1, Wilson G. 2, Byrne C. 1
1 School of Human Movement and Sport Sciences, University of Ballarat, Victoria, Australia;
2 The Centre for Exercise Science and Sport Management Southern Cross University, Victoria, Australia
Background. The purpose of this investigation was to determine the relationships between the strength qualities of the leg extensor musculature and performance in vertical jumps (VJ) performed from a standing position and a run-up.
Methods. Twenty-nine males with experience in jumping activities were tested for vertical jumping capacities with a standing VJ (double leg takeoff) and run-up jumps from a 1, 3, 5 and 7 stride approach (single leg takeoff). The speed-strength and maximum strength qualities of the leg extensors were assessed by tests involving concentric, stretch-shortening cycle (SSC) and isometric muscular actions. Pearson’s correlations and stepwise multiple regression was performed to describe the relationships with jumping performance.
Results. The speed-strength tests correlated significantly with both jump types (r=0.55-0.82), but maximum strength did not. A drop jump test considered to measure reactive strength correlated more strongly with the run-up jump than the standing VJ. The standing VJ was best predicted by a low stretch load SSC test, whereas the run-up jump was best predicted by a model that also including the test of reactive strength.
Conclusion. The role of maximum strength in jumping performance was not clear but speed-strength qualities were considered important. It was concluded that reactive strength is relatively more important for jumping from a run-up than for the standing VJ, and this should be reflected by appropriate training methods and test protocols for the assessment of athletes who jump.