Pioneering studies by Dr. Eleanor Metheny, who conducted careful anthropometric studies of American blacks 40 years ago, broadly outlined the differences between whites and blacks. Metheny found that, in general, blacks had longer legs relative to total body length and that lower legs were proportionately longer, while thighs were shorter but more muscular than those of whites. "In jumping, the longer leg is evidently an advantage," Dr. Metheny wrote, "since [he] could raise his leg higher. Applying the principle of the lever, the longer lower leg can develop greater velocity at the end and serves as a longer lever with which to push off the ground, thus increasing the distance over which the force can be applied." The same general rules, Metheny found, applied to blacks' arms: on the average, blacks' hands are larger than those of whites, their arms longer, and a short, heavily muscled upper arm propels a long lower arm. Once more, the combination of leverage and musculature favors blacks in throwing.
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