FIGURE 1. Walking speed as a function of gravity.

From the following article:

Biomechanics: Walking on other planets

Alberto E. Minetti

Nature 409, 467-469(25 January 2001)

doi:10.1038/35054166

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The curves represent the predictions of the theory of dynamic similarity. These predictions were made using the Froude-number equation, Fr = v2/(g times l), where v is the velocity in m s-1, g is the acceleration due to gravity in m s-2, l is 0.92 m (the average leg length for adult male humans), and Fr is 0.25 (which sets the optimal walking speed on Earth9, 10, 11, 12) or 0.5 (at which humans move spontaneously from a walk to a run on Earth3). Squares and orange circles refer to measurements of optimal walking speeds4 and walk-to-run-transition speeds5, respectively, in simulated low-gravity conditions. The triangle represents a previous estimate of reduced walking speed on the Moon13. Green circles represent recent measurements of optimal speed obtained using parabolic flight to simulate low- and high-gravity conditions6, 7.

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