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the claim

Calf muscles act as a second heart by pumping blood back upward

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Calf muscles act as a second heart by pumping blood back upward?

Yes. Multiple physiological studies and biomechanical models support the well-established concept that the calf muscles act as a pump, facilitating the return of venous blood upward toward the heart against gravity.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The retrieved papers uniformly support the physiological role of the calf muscle pump in facilitating venous return from the lower limbs. Papers 1, 6, and 9 explicitly discuss and model how calf muscle contractions pump blood upward, verifying the claim.

Evidence for · 4
Lower extremity venous anatomy.
2005
States that blood flow within lower extremity veins is ensured by muscular venous pumps and bicuspid valves.
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MH, M. (2005). Lower extremity venous anatomy.. doi.org. https://doi.org/10.1055/s-2005-921948

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More for · 3
A 1D pulse wave propagation model of the hemodynamics of calf muscle pump function
2015
Models the calf muscle pump mechanism which increases venous return and compensates for fluid shifts during standing.
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Keijsers, J., Keijsers, J., Leguy, C., Huberts, W., Huberts, W., Narracott, A., Rittweger, J., & Vosse, F. (2015). A 1D pulse wave propagation model of the hemodynamics of calf muscle pump function. doi.org. https://doi.org/10.1002/cnm.2714

The human lower leg muscle pump functions as a flow diverter pump, maintaining low ambulatory venous pressures during locomotion
2024
Examines how the lower leg muscle pump functions to maintain venous pressures and assist circulation during locomotion.
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Tauraginskii, R., Lurie, F., Simakov, S., Agalarov, R., Khramtsov, P., Babushkin, M., Gurina, T., & Borsuk, D. (2024). The human lower leg muscle pump functions as a flow diverter pump, maintaining low ambulatory venous pressures during locomotion. doi.org. https://doi.org/10.1016/j.jvsv.2024.101996

Contribution of the calf pump and foot pump to the return of venous blood from the lower extremity
2017
Describes the calf muscle pump as an effective mechanism enhancing the return of venous blood toward the heart.
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Recek, C. (2017). Contribution of the calf pump and foot pump to the return of venous blood from the lower extremity. doi.org. https://doi.org/10.24019/jtavr.43

Receipt History
first checked06 Aug 2026
judged → SUPPORTED · 8706 Aug 2026
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