Weight support distribution during quadrupedal walking in Ateles and Cebus

Bibliographic Data

ID8313014
AuthorsG Larson (0000-0003-4057-2954, Stony Brook School, corresponding author), Susan G Larson, Brigitte Demes (Stony Brook University)
Year2011
Volume144
Issue4
Pages633-642
Publication date2011-04-01
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueAmerican Journal of Physical Anthropology (JOURNAL)
Journal identifiersISSN: 0002-9483 • E-ISSN: 1096-8644
PublisherWiley (PUBLISHER • GB)
DOI10.1002/ajpa.21460
PMID21404239
OpenAlexW2106199746
LanguageEN
Citations received16
References cited37

While it is well known that primate quadrupeds are distinctive in supporting more body weight on their hind limbs than their forelimbs, it has been unclear how this support asymmetry comes about. The simple explanation of a difference in body center of mass (COM) position is not supported by empirical data, leaving two less intuitive proposals. The first involves the position of the hands and feet relative to the COM, and has recently received support by Raichlen et al. (Am J Phys Anthropol 138 ( 2009 ) 395‐402) who document that chimpanzees walk with a relatively protracted hind limb, bringing their feet closer to the COM for greater hind limb weight support. The second posits the use of hip retractor muscles to actively shift weight off the forelimbs and onto the hind limbs, and has received recent support by Larson and Stern (Am J Phys Anthropol 138 ( 2009 ) 343‐355), who report higher levels of hip extensor activity in primates that bear more weight on their hind limbs. Since the study by Raichlen et al. (Am J Phys Anthropol 138 ( 2009 ) 395‐402) is based on a limited empirical dataset, we have undertaken a replicate study to document average limb posture and weight support distribution in two additional primate species: Ateles and Cebus . Using the equations presented by Raichlen etal. (Am J Phys Anthropol 138 ( 2009 ) 395‐402), predicted forelimb weight support based on limb posture was compared to observed values based on vertical impulses. In contrast to their findings, the limb posture model dramatically overestimated actual forelimb weight support in the monkeys, calling into question the general applicability of this model. Am J Phys Anthropol, 2011. © 2011 Wiley‐Liss, Inc

Biology · Body weight · Forelimb · Hindlimb · Primate · Quadrupedalism · Amphibian and Reptile Biology · Anatomy · Ecology · Evolution and Paleontology Studies · Primate Behavior and Ecology

Tools

Open DOISci-Hub