Comparisons of walking and running.

http://www.fas.harvard.edu/~skeleton/pdfs/2004e.pdf

Figure 1 Comparisons of walking and running.

a, Kinematics of walking (left) and running (right), from plates 4 and 18 of ref. 64. During walking, the head and centre of gravity are lowest near toe-off (TO) and highest at mid-stance (MS) where the leg is relatively straight. During running, the head and centre of gravity are highest during the aerial phase and lowest at MS, when the hip, knee and ankle are flexed; the trunk is also more inclined and the elbow more flexed.

b, Biomechanical contrasts between human gaits. During walking, an inverted pendulum mechanism exchanges forward kinetic energy (E kf) for gravitational potential energy (E p) between heelstrike (HS) and MS; the exchange is reversed between MS and TO. During running, a mass-spring mechanism causes E p and E kf to be in phase, with both energies declining rapidly to minima between footstrike (FS) and MS. Leg tendons and ligaments partially convert decreases in E p and E kf to elastic strain energy (E es) during the first half of the stance, which is subsequently released through recoil between MS and TO.

http://www.fas.harvard.edu/~skeleton/pdfs/2004e.pdf

ほら、走るのと歩くのは全然違うんだよ。