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Thread: Centripedal forces and the calf muscle pump

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    Re: Centripedal forces and the calf muscle pump

    Here is an abstract of a very recent paper which looks a calf muscle pump function (below) .

    Pump function is looked at under 3 conditions but none replicate the additional centripetal forces encountered during gait .

    I am not a physicist but as close as I can roughly calculate , if an individual is running at 3m/s with a hip joint to plantar foot length of 1m ,then ,if they also have very little leg lift ,venous blood in the foot is effectively subject to 2Gs . There will be a reduction in centripetal forces and "centrifugal effect" the further distally you move along the leg .

    Is this not significant ?

    Ton ,as the "physicist in residence" as it were, can you help with this at all ?

    Cheers

    Gerry

    Phlebology. 2018 Jun;33(5):353-360. doi: 10.1177/0268355517709410. Epub 2017 May 22.
    Optimizing calf muscle pump function.

    Lattimer CR1,2,3, Franceschi C4, Kalodiki E1,2,3.
    Author information



    Abstract

    Background The tip toe manoeuvre has been promoted as the gold standard plethysmography test for measuringcalf muscle pump function. The aim was to compare the tip toe manoeuvre, dorsiflexion manoeuvre and a body weight transfer manoeuvre using the ejection fraction of air-plethysmography and evaluate which has the best pumping effect. Methods Sixty-six archived tracings on 22 legs were retrieved from an air-plethysmography workshop and analysed. Pumping performance was measured using the calf volume reduction after each manoeuvre. Results Expressed as median [inter-quartile range], body weight transfer manoeuvres resulted in a significantly greater ejection fraction (%) than tip toe manoeuvres at 59.7 [53.5-63.9] versus 42.6 [30.5-52.6], P < 0.0005 (Wilcoxon). There was no significant difference in the ejection fraction between the tip toe manoeuvre versus dorsiflexion manoeuvre, P = 0.615. The repeatability (confidence interval: 95%) of 66 ejection fraction tests was excellent: tip toe manoeuvre (±1.2), dorsiflexion manoeuvre (±1.3) and body weight transfer manoeuvre (±1.6). Conclusion The body weight transfer manoeuvre appears to be a better method of measuring the full potential of the calf muscle pump with a 40.1% relative increase in the ejection fraction compared to a tip toe manoeuvre. Exercises which involve body weight transfers from one leg to the other may be more important inoptimizing calf muscle pump function than ankle movement exercises.

    Last edited by Gerrard Farrell; 02-09-2019 at 07:25 AM.

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