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2013 | 38 | 191-200

Article title

The Influence of an Additional Load on Time and Force Changes in the Ground Reaction Force During the Countermovement Vertical Jump

Content

Title variants

Languages of publication

EN

Abstracts

EN
The aim of this study was to determine how an additional load influences the force-vs-time relationship of the countermovement vertical jump (CMVJ). The participants that took part in the experiment were 18 male university students who played sport recreationally, including regular games of volleyball. They were asked to perform a CMVJ without involving the arms under four conditions: without and with additional loads of 10%, 20%, and 30% of their body weight (BW). The vertical component of the ground reaction force (GRF) was measured by a force plate. The GRF was used to calculate the durations of the preparatory, braking, and acceleration phases, the total duration of the jump, force impulses during the braking and acceleration phases, average forces during the braking and acceleration phases, and the maximum force of impact at landing. Results were evaluated using repeated-measures ANOVA. Increasing the additional load prolonged both the braking and acceleration phases of the jump, with statistically significant changes in the duration of the acceleration phase found for an additional load of 20% BW. The magnitude of the force systematically and significantly increased with the additional load. The force impulse during the acceleration phase did not differ significantly between jumps performed with loads of 20% and 30% BW. The results suggest that the optimal additional load for developing explosive strength in vertical jumping ranges from 20% to 30% of BW, with this value varying between individual subjects.

Publisher

Year

Volume

38

Pages

191-200

Physical description

Dates

published
1 - 09 - 2013
online
08 - 10 - 2013

Contributors

  • Human Motion Diagnostic Center, University of Ostrava, The Czech Republic
  • Department of Physical Education and Sports, VŠB-Technical University of Ostrava, Ostrava, The Czech Republic
  • Human Motion Diagnostic Center, University of Ostrava, The Czech Republic
  • Human Motion Diagnostic Center, University of Ostrava, The Czech Republic
author
  • Human Motion Diagnostic Center, University of Ostrava, The Czech Republic
  • Human Motion Diagnostic Center, University of Ostrava, The Czech Republic
author
  • Faculty of Sport, University of Ljulbjana, Ljubljana, Slovenia
author
  • Faculty of Sport, University of Ljulbjana, Ljubljana, Slovenia

References

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.-psjd-doi-10_2478_hukin-2013-0059
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