During quadrupedal trotting, diagonal pairs of limbs are set down in unison and exert forces on the ground simultaneously. Ground-reaction forces on individual limbs of trotting dogs were measured separately using a series of four force platforms. Vertical and fore-aft impulses were determined for each limb from the force/time recordings. When mean fore-aft acceleration of the body was zero in a given trotting step (steady state), the fraction of vertical impulse on the forelimb was equal to the fraction of body weight supported by the forelimbs during standing (approximately 60 %). When dogs accelerated or decelerated during a trotting step, the vertical impulse was redistributed to the hindlimb or forelimb, respectively. This redistribution of the vertical impulse is due to a moment exerted about the pitch axis of the body by fore-aft accelerating and decelerating forces. Vertical forces exerted by the forelimb and hindlimb resist this pitching moment, providing stability during fore-aft acceleration and deceleration.
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JOURNAL ARTICLE| 15 December 1999
Acceleration and balance in trotting dogs
D.V. Lee ,
J.E. Bertram ,
Online Issn: 1477-9145
Print Issn: 0022-0949
© 1999 by Company of Biologists
J Exp Biol (1999) 202 (24): 3565–3573.
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D.V. Lee, J.E. Bertram, R.J. Todhunter; Acceleration and balance in trotting dogs. J Exp Biol 15 December 1999; 202 (24): 3565–3573. doi: https://doi.org/10.1242/jeb.202.24.3565
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