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Ground reaction forces associated with an effective elementary school based jumping intervention.

H McKay¹, G Tsang, A Heinonen

¹Department of Family Practice and Orthopaedics, Faculty of Medicine, University of British Columbia, Vancouver, Canada. mcKayH@interchange.ubc.ca <mcKayH@interchange.ubc.ca>

British Journal of Sports Medicine

|December 25, 2004

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Childhood mechanical loading is crucial for bone development. This study measured ground reaction forces (GRFs) in various childhood jumps, finding simple jumps generate significant forces, suggesting caution when increasing jump height for exercise interventions.

Area of Science:

Pediatric biomechanics
Skeletal development
Exercise physiology

Background:

Mechanical loading is vital for childhood skeletal growth.
Ground reaction forces (GRFs) can indicate bone strain during physical activity.
Limited pediatric research exists on GRFs across diverse loading activities.

Purpose of the Study:

To quantify biomechanical variables in common childhood activities.
To inform an elementary physical education intervention aimed at enhancing bone health in children.

Main Methods:

Measured maximal GRF, rate of force development, and time to maximal force.
Utilized a force platform to assess 12 different jumping activities.
Included 70 children aged 8.3-11.7 years.

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Main Results:

Highest normalized GRFs (approx. 5 times body weight) were observed during plyometric drop jumps and countermovement jumps.
Jumping jacks produced lower GRFs (approx. 3.5 times body weight).
Peak rates of force were approximately 500 times body weight per second for specific jumps.

Conclusions:

Simple, low-equipment jumps generate substantial GRFs (3.5-5x BW) and high rates of force (~500x BW/s).
Children may naturally reduce impact forces when jumping from greater heights.
Simply increasing jump height may not effectively progress exercise interventions for bone health.