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Figure 1


Fig. 1. A plot of speed-frequency relations for a single subject running under the three constraint conditions imposed in this study. Red circles show frequencies selected when speed is constrained in treadmill running, blue circles show speeds selected when frequency is constrained in over-ground running to a metronome beat, and green circles indicate the speed-frequency combinations selected when step length is constrained by stepping in registry with ground markers. Each relation was fit with a least-squares linear regression with the constrained parameter as the independent variable, then the relationship determined was converted to speed-frequency for comparison (see text for details). The point of intersection of the v-constrained, f-constrained and d-constrained relationships gives apparent preferred speed and frequency (vp and fp).





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