Related Experiment Video
Updated: Dec 6, 2025

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
Published on: May 26, 2020
The Impact of External Loads Carried by Police Officers on Vertical Jump Performance
Amy Wiley1, Aaron Joseph1, Robin Orr1,2
1Bond Institute of Health and Sport, Bond University Gold Coast QLD 4229, AUSTRALIA.
Abstract:
The purpose of this study was to examine the impact that external loads have on vertical jump height and peak anaerobic power output (PAPw) of police officers during a vertical jump (VJ) test. Retrospective data of 47 (mean age 38.79 ± 7.97 years) police officers from a US Law Enforcement Agency (LEA) were used for analysis. VJ heights and body mass were used in the Sayers Peak Power Equation to calculate PAPw. Power-to-weight (P:W) ratios were then calculated by dividing PAPw by the officer's body mass. VJ height significantly (p < .001) decreased with load (unloaded = 49.49 ± 8.46 cm: loaded = 43.62 ± 7.68 cm). A Pearson's correlation showed a significant (p < .01) low-moderate (r = .387) relationship between absolute load (9.57 ± .94 kg) and change in PAPw, and a significant (p < .01) strong (r = .794) correlation between relative load and changes in P:W. This study supports previous research that suggests that occupational load carriage has a negative impact on VJ performance in police officers and may influence job performance, and that training programs may mitigate these negative effects.
Related Concept Videos
Impact Loading
In cases of elastic deformation,...
Stresses under Combined Loadings
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
Impact Loading on a Cantilever Beam
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
Euler's Formula to Columns: Problem Solving
The system comprises two vertical rigid bars, AB and BC, of...
Behavior of Concrete Under Compressive Load
As the concrete specimen fractures under...
Applications of Stress
The...

