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Related Concept Videos

Impact: Problem Solving01:26

Impact: Problem Solving

In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
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Horizontal motion, governed by the initial kick, maintains a constant velocity throughout the flight of the soccer ball.

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Related Experiment Video

Updated: Jun 5, 2026

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
06:52

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Published on: May 26, 2020

Pelvic kinematic method for determining vertical jump height.

Loren Z F Chiu1, George J Salem

  • 1Neuromusculoskeletal Mechanics Research Program, University of Alberta, Edmonton, AB, Canada.

Journal of Applied Biomechanics
|January 20, 2011
PubMed
Summary
This summary is machine-generated.

The pelvic kinematic method accurately estimates vertical jump height in athletes. This method, using markers on the pelvis, shows strong agreement with the ground-reaction force-impulse method for calculating center of mass displacement.

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Last Updated: Jun 5, 2026

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Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Sports Science

Background:

  • Estimating total body center of mass (CoM) is crucial for analyzing human movement.
  • Existing methods using sacral markers and pelvis reconstruction are validated for low-intensity tasks like gait and hopping.
  • Validation for high-intensity movements, such as maximal vertical jumps, using these methods is lacking.

Purpose of the Study:

  • To compare the accuracy of the pelvic kinematic method against the ground-reaction force-impulse method for determining center of mass displacement during maximal vertical jumps.
  • To assess the concurrent validity of the pelvic kinematic method for calculating vertical jump height in experienced athletes.

Main Methods:

  • Experienced athletes (n=13) performed restricted countermovement vertical jumps.
  • Motion analysis data were collected using an 8-camera system and two force platforms.
  • Pelvis center of mass was reconstructed using retro-reflective markers; jump height was derived from peak pelvis CoM displacement.

Main Results:

  • A strong linear relationship (R² = .86, p < .01) was found between the pelvic kinematic and impulse methods for CoM displacement.
  • The pelvic kinematic method showed a small underestimation of jump height compared to the impulse method (CV = 4.34%).

Conclusions:

  • The pelvic kinematic method demonstrates concurrent validity for determining vertical jump height.
  • This method provides a reliable alternative for assessing center of mass displacement during maximal vertical jumps.