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Running humans attain optimal elastic bounce in their teens
Mario A Legramandi1, Bénédicte Schepens, Giovanni A Cavagna
1Section of Human Physiology, Department of Pathophysiology and Transplantation-DePT, University of Milan, 20133 Milan, Italy.
Scientific Reports
|February 20, 2013
Summary
Human jumping mechanics improve with age, reaching peak elastic bounce similarity in adolescence. This mirrors a significant reduction in impact forces, with trends reversing later in life.
Area of Science:
- Biomechanics
- Human motor development
- Pediatric physiology
Background:
- An ideal elastic bounce involves equal push and braking times and symmetric velocities.
- Older adults exhibit greater deviations from this ideal model compared to younger adults.
- The changes in elastic bounce similarity during human growth are not well understood.
Purpose of the Study:
- To investigate how elastic bounce similarity changes during human growth.
- To determine if an optimal elastic bounce is achieved at a specific age.
- To correlate changes in elastic bounce with impact deceleration during development.
Main Methods:
- Analysis of biomechanical data from individuals across a lifespan.
- Quantification of elastic bounce similarity using kinematic variables.
- Measurement of impact deceleration peaks during ground contact.
Main Results:
- Elastic bounce similarity is lowest at 2 years of age.
- Similarity increases with age, peaking between 13-16 years.
- A sixfold decrease in impact deceleration occurs during this developmental period.
- These developmental trends begin to reverse later in life.
Conclusions:
- Human elastic bounce similarity follows a U-shaped trajectory across the lifespan, with a peak in adolescence.
- Adolescent development of elastic bounce mechanics is associated with significantly reduced impact loading.
- Understanding these developmental changes provides insights into injury prevention and performance optimization.
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