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Understanding how an arm swing enhances performance in the vertical jump
Adrian Lees1, Jos Vanrenterghem, Dirk De Clercq
1Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Henry Cotton Campus, Webster Street, Liverpool L3 2ET, UK.
Journal of Biomechanics
|November 3, 2004
Summary
Using an arm swing significantly enhances jumping performance by increasing the height and velocity of the center of mass at takeoff. This improvement results from a combination of factors, not a single theory.
Area of Science:
- Biomechanics
- Human Movement Science
- Sports Physiology
Background:
- Arm swing is a common technique used to improve vertical jump height.
- Previous theories have attempted to explain the biomechanical mechanisms behind arm swing enhancement.
Purpose of the Study:
- To investigate and compare the biomechanical factors contributing to enhanced vertical jump performance with and without an arm swing.
- To evaluate existing theories explaining the arm swing's effect on jumping.
Main Methods:
- Twenty adult males performed maximal vertical jumps with and without arm swings.
- Kinematic, kinetic, and electromyographical data were collected during jumps.
- Analysis focused on the center of mass and segmental contributions.
Main Results:
- Participants jumped 0.086 m higher with an arm swing.
- Arm swing increased center of mass height (28%) and velocity (72%) at takeoff.
- Mechanisms included arm segment elevation, energy transfer from joints (shoulder, elbow, hip), and elastic energy storage/release.
Conclusions:
- Enhanced jumping performance with arm swing is multifactorial.
- No single theory fully explains the observed improvements.
- A combination of mechanisms, including energy transfer and elastic storage, contributes to the enhanced jump.