Accurately Measuring GMax for Safer Sports Surfaces

GMax measures the shock attenuation of sports surfaces. The higher the GMax value, the less absorption of force by the playing surface and the greater the magnitude of impact. ASTM International defines a GMax reading exceeding 200 as the level to expect life threatening injuries and is accepted by the U.S. Consumer Products Safety Commission. The Synthetic Turf Council guidelines specify that no test location exceed a GMax value of 165. ASTM specifications include ten sport-specific test locations.

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