Second, heel-dragging comes from a persistent notion that America's hydrocarbons are somehow uniquely precious, so rare in fact that, unlike any other commodity, the U.S. government should not allow American crude oil to be sold to other nations.
Hence, the impact of heels appears to be twofold: first, heels change the gait of a woman, hence change judgments of her attractiveness when she walks; second, heels also change her posture and body when she remains static.
Around 1600 the first heel appears; it is often painted red.
Gait includes pacing, the length of the stride, the swing of the leg to put the foot forward, the shift of balance from one leg to the other, how the foot is planted (toe first, heel first), and how the weight is distributed through the step.
Altogether these data suggest that the end of gait initiation occurs at first heel on and that the walking program begins before first toe off.
The termination of this program and the switch to the walking program may occur at first heel on as reported by Brunt et al. (1991).
In kinematics, the similarities between gait initiation and walking begin at first toe off in the frontal and horizontal plane and around the first heel on in the sagittal plane (Fig. 5, 6, 7, 8).
In the sagittal plane, at the first toe off, the pelvis and lumbar area moves the trunk in a general forward inclination, to reach its maximum at first heel on (Fig. 6).
The assessor stopped timing as soon as the participant's first heel completely crossed the strip of orange tape.
