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Figure 1


Fig. 1. Ground reaction forces (GRF) in the frontal plane of a sprinter along a straight path (A) and on a curved path (B). Along a straight path, lateral forces (Flateral) are negligible and the peak vertical component of the GRF (Fvertical) equals the peak resultant GRF (Fresultant). When running along a curved path, Flateral comprises a significant portion of the total resultant force. If the upper limit to Fresultant is achieved on the curve as Greene's theory suggested (Greene, 1985), then for the same Fresultant, Fvertical on the curve must be smaller relative to that generated on a straight path. Note that the axis of the fore–aft component of the GRF is coming out of the page in both cases and the fore–aft component is negligible when Fresultant is at its peak.





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