Research Project

  • Artur Struzik


Leg stiffness is a quantitative measure of the elastic properties that determine the ability to accumulate potential elastic energy in a vertical jump. The conceptual and methodological confusion surrounding leg stiffness makes it difficult to organize the knowledge and compare the results obtained in past research. This study attempts to standardize the concepts found in the literature and presents a methodology for determining leg stiffness during vertical jumps based on measurements of the slope of the ground reaction force curve with respect to length changes. Therefore, the aim of this study was to determine normative values for leg stiffness for young, healthy non-athletes during single vertical jumps to maximal and specific heights. Before it will be possible to provide answer to the questions about relationships between leg stiffness and sport movement performance and injury risk, it seems necessary to first estimate a leg stiffness baseline value for average representatives of the population. With this approach, it will be possible to truly compare the leg stiffness values obtained from non-athletes with those obtained from athletes. Leg (quasi-) stiffness is understood as a ratio of changes in ground reaction forces to respective changes in “spring length” that represents both lower limbs.


Akimbo Arm swing Asymmetry Countermovement Force-displacement relationship Jump height Leg stiffness Motion system Potential elastic energy Quasi-stiffness Spring-mass model Stretch-shortening cycle Submaximal performance Take-off Vertical jump 


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Artur Struzik
    • 1
  1. 1.University School of Physical EducationWrocławPoland

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