Leg stiffness and mechanical energetic processes during jumping on a sprung surface

Article Abstract:

This article examines the relationship between leg joint stiffness and mechanical energy production during drop jumps from varying heights. Findings indicate that increases in leg stiffness during drop jumps result in increases in the force transmitted to the flexible surface and decreases in the mechanical energy created by the athletes.

Statistical Data Included, Usage, Joints, Measurement, Biomechanics, Range of motion, Force and energy, Jumping, Cameras (Photography), Cameras

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Symmetry and reproducibility of kinematic parameters during various running techniques

Article Abstract:

Results reveal that a single monolateral trial can provide reproducible and symmetric values for most kinetic parameters during running techniques. Furthermore, datreliabilitya indicate that the degree of reproducibility and kinematic data symmetry do not depend on the running techniques but depend on the parameter itself.

Methods, Analysis, Evaluation, Kinematics, Running, Treadmill exercise tests, Test reliability

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Interaction of the human body and surfaces of different stiffness during drop jumps

Article Abstract:

A study to test the hypotheses that the stiffness of the surface influences leg stiffness of the persons during drop jumps as well as the increase in drop jumping performance with decreasing surface stiffness due to the greater energy storage capacity of the surface for a given acting force is given. The results showing lower absolute energy loss for hard surfaces with better jumping performance for the soft one during interaction between the human body and surfaces are also discussed.

United States, Science & research, Health aspects, Care and treatment, Injuries, Exercise, Athletes, Leg injuries, Energy transformation

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