![]() Human beings provide an illustrative case study. All of these factors vary with body size, limb morphology and the distance over which speed is measured. Jones and Lindstedt, 1993 Weyand et al., 1994), and (6)the strength of bones, ligaments and tendons (e.g. Farley, 1997), (5) the aerobic capacity of the lungs and circulatory system (e.g. Weyand et al., 2000), (4) the stiffness of the `spring' formed by the muscles, ligaments and skeleton (e.g. Hutchison and Garcia, 2002 Weyand and Davis, 2005), (2)the rate at which energy can be provided to the limbs( Keller, 1973), (3) the ground force muscles can produce (e.g. Maximum running speeds have been predicted based on (1)the mass of the body or of its locomotory musculature (e.g. Several approaches have been applied to this task. One common index is a comparison between measured and predicted maximum speeds: if we understand the physiology and mechanics of locomotion in a particular animal, we should be able to accurately predict how fast that animal can run. The extent of our understanding of the complex process of legged locomotion can be assessed through a variety of metrics.
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