The duration that a runner's foot remains in contact with the ground during each step, typically measured in milliseconds. Shorter ground contact times generally indicate more efficient running mechanics and greater power output relative to body weight.
Descriptive compound term that emerged in running biomechanics research in the 1980s as technology allowed precise measurement of foot-ground interaction. The concept became more widely known with the advent of consumer running watches that could measure this metric.
Elite distance runners have ground contact times around 180-200 milliseconds, while recreational runners often exceed 250ms. What's fascinating is that this isn't just about speed - it's about elastic energy return. The shorter your foot stays on the ground, the more you can utilize the spring-like properties of your tendons and muscles, essentially getting free energy back from each step!
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