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    From Primum Sapienti@21:1/5 to littoral.homo@gmail.com on Sat Sep 4 22:45:49 2021
    littoral.homo@gmail.com wrote:
    The "dog paddle":
    Stereotypic swimming gait pattern in different dog breeds
    Fish Frank, DiNennoNicole & Trail Jonathan 2020
    Anat Rec doi org/10.1002/ar.24396

    The term "dog paddle" has been applied to the swimming behavior of various terrestrial & aquatic spp. Dog paddling
    It refers to a form of drag‐based, paddle propulsion, in which the limbs are oriented underneath the body & moved through an arc.
    Despite the ubiquity of the term, there has been no analysis of the swimming kinematics of dogs.

    Despite the ubiquity of the term "dog paddle" to describe the swimming motions of animals, this is the first time that the swimming motions of dogs have been analyzed.

    Underwater video was recorded of 8 surface-swimming dogs (0.4–1.1 m/s) from Yorkshire Terrier 3.6 kg to Newfoundland dog 63.5 kg.
    The QP paddling stroke was analyzed, to determine kinematics & coordination of the limbs.
    The paddling stroke represented a modified terrestrial gait, outside typical gaits for terrestrial locomotion by dogs.
    Stroke frequency decreased with increasing body size.
    The stroke cycle consisted of power & recovery phases:
    -During the power phase, digits of the paw were abducted, and the forelimb was swept posteriorly until perpendicular to the body.
    -In the recovery phase, digits were adducted, the brachium was retracted anteriorly, the manus supinated.
    The power phase was c 34 % of stroke cycle, shorter than the recovery phase for fore- & hindlimbs.
    Maximum velocity during the power phase was greater than the recovery phase.

    Terrestrial locomotion in dogs shows substantial variation in gait,
    but the modified terrestrial gait used for swimming by dogs appears to be stereotypic among breeds.
    Without constraints imposed by gravity & substrate contact, swimming dogs can utilize a gait profile different from terrestrial gaits.

    ____

    Are our dogs domesticated "waterside wolves"?
    Early H.sapiens living in floating huts on the lake, chasing ducks or so in the reeds, corporating with wolves waiting at the shore, then wolf pups raised in the floating huts?
    If so (??), early dogs might have evolved a special swimming-style.

    (BTW, our littoral archaic ancestors' swimming style was probably undulating, not "dog paddle", google "coastal dispersal Pleistocene Homo 2018 verhaegen".)


    https://www.businessinsider.com/photos-puppies-diving-underwater-2014-9

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  • From littoral.homo@gmail.com@21:1/5 to All on Tue Sep 7 02:58:47 2021
    https://www.businessinsider.com/photos-puppies-diving-underwater-2014-9


    and because puppies can swim, AAT is wrong...
    Why am I losing my time with such idiots??

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  • From Primum Sapienti@21:1/5 to littor...@gmail.com on Fri Sep 17 22:34:20 2021
    littor...@gmail.com wrote:


    https://www.businessinsider.com/photos-puppies-diving-underwater-2014-9


    and because puppies can swim, AAT is wrong...
    Why am I losing my time with such idiots??


    "early dogs might have evolved a special swimming-style"

    Rubbish.

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