Abstract:
:Most quadrupeds walk with lateral sequence (LS) gaits, where hind limb touchdowns are followed by ipsilateral forelimb touchdowns. Primates, however, typically walk with diagonal sequence (DS) gaits, where hind limb touchdowns are followed by contralateral forelimb touchdowns. Because the use of DS gaits is nearly ubiquitous among primates, understanding gait selection in primates is critical to understanding primate locomotor evolution. The Support Polygon Model [Tomita, M., 1967. A study on the movement pattern of four limbs in walking. J. Anthropol. Soc. Nippon 75, 120-146; Rollinson, J., Martin, R.D., 1981. Comparative aspects of primate locomotion, with special reference to arboreal cercopithecines. Symp. Zool. Soc. Lond. 48, 377-427] argues that primates' use of DS gaits stems from a more caudal position of the whole-body center of mass (COM) relative to other mammals. We tested the predictions of the Support Polygon Model by examining the effects of natural and experimental variations in COM position on gait mechanics in two distantly related primates: fat-tailed dwarf lemurs (Cheirogaleus medius) and patas monkeys (Erythrocebus patas). Dwarf lemur experiments compared individuals with and without a greatly enlarged tail (a feature associated with torpor that can be expected to shift the COM caudally). During patas monkey experiments, we experimentally shifted the COM cranially with the use of a weighted belt (7-12% of body mass) positioned above the scapulae. Examination of limb kinematics revealed changes consistent with systematic deviations in COM position. Nevertheless, footfall patterns changed in a direction contrary to the predictions of the Support Polygon Model in the dwarf lemurs and did not change at all in the patas monkey. These results suggest that body mass distribution is unlikely to be the sole determinant of footfall pattern in primates and other mammals.
journal_name
J Hum Evoljournal_title
Journal of human evolutionauthors
Young JW,Patel BA,Stevens NJdoi
10.1016/j.jhevol.2007.01.005subject
Has Abstractpub_date
2007-07-01 00:00:00pages
26-40issue
1eissn
0047-2484issn
1095-8606pii
S0047-2484(07)00043-7journal_volume
53pub_type
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journal_title:Journal of human evolution
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journal_title:Journal of human evolution
pub_type: 杂志文章,评审
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Journal of human evolution
pub_type: 杂志文章
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journal_title:Journal of human evolution
pub_type: 历史文章,杂志文章
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journal_title:Journal of human evolution
pub_type: 杂志文章
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journal_title:Journal of human evolution
pub_type: 杂志文章,评审
doi:10.1006/jhev.1999.0335
更新日期:2000-02-01 00:00:00
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pub_type: 杂志文章
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