Abstract
Habitual quadrupeds have been shown to display a planar covariance of segment elevation angle waveforms in the fore and hind limbs during many forms of locomotion. The purpose of the current study was to determine if humans generate similar patterns in the upper and lower limbs during hand–foot crawling. Nine healthy young adults performed hand–foot crawling on a treadmill at speeds of 1, 2, and 3 km/h. A principal component analysis (PCA) was applied to the segment elevation angle waveforms for the upper (upper arm, lower arm, and hand) and lower (thigh, shank, and foot) limbs separately. The planarity of the elevation angle waveforms was determined using the sum of the variance explained by the first two PCs and the orientation of the covariance plane was quantified using the direction cosines of the eigenvector orthogonal to the plane, projected upon each of the segmental semi-axes. Results showed that planarity of segment elevation angles was maintained in the upper and lower limbs (explained variance >97%), although a slight decrease was present in the upper limb when crawling at 3 km/h. The orientation of the covariance plane was highly limb-specific, consistent with animal studies and possibly related to the functional neural control differences between the upper and lower limbs. These results may suggest that the motor patterns stored in the central nervous system for quadrupedal locomotion may be retained through evolution and may still be exploited when humans perform such tasks.
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This research was financially supported by the Italian Ministry of Health (IRCCS Ricerca corrente), Italian Space Agency (COREA Grant 2013-084-R.0), and Horizon 2020 Robotics Program (ICT-23-2014 under Grant Agreement 644727-CogIMon).
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MacLellan, M.J., Catavitello, G., Ivanenko, Y.P. et al. Planar covariance of upper and lower limb elevation angles during hand–foot crawling in healthy young adults. Exp Brain Res 235, 3287–3294 (2017). https://doi.org/10.1007/s00221-017-5060-y
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DOI: https://doi.org/10.1007/s00221-017-5060-y