Test report from a 5-time Western Australia State Champion
Test report from Footwear & Recreation Technology Research Institute
Comparison of “g” factor and energy return
shoe styles
“g” factor (lower is better)
energy return% (higher is better)
running shoes
9~15
30~45
sports shoes
12~21
25~48
casual shoes
12~19
30~38
dress shoes
28~42
22~41
Attey & Lin
11.5
67
Test Method
1. the center of front and back sole of the shoe are compressed by the machine.
2. the material elasticity and energy absorption are determined by the compression test.
Test Instructions
The “G” factor represents the ability of energy absorption. A material absorbs more energy and protects our knee from impact when it has a lower “G” factor.
Comparison of different shoe types
Utility=energy return/”g” factor ; higher is better