The soleus muscle, located in the calf, acts as a 'second heart' by promoting venous return, and its stimulation offers significant benefits for glucose metabolism.

noli's read

The 'second heart' analogy is a classic metaphor in physiology to describe the role of the calf's muscle-vein pump, which effectively helps blood return to the heart against gravity, a well-established fact. Regarding metabolism, a 2022 study published in 'iScience' (Hamilton et al.) highlighted that the 'soleus pushup' (a specific contraction of the soleus) considerably increases local metabolic oxidation. This is an interesting interventional study (RCT) showing an improvement in blood glucose regulation after meals. However, it is important to note that while the results are promising, the study involves a small sample size and took place in a laboratory. Labeling this a miracle solution for metabolism remains an extrapolation, as the long-term impact and effects on diverse populations still require further research. The physiological mechanism is sound, but the magnitude of the benefits in real-world conditions is sometimes simplified in wellness discourse.

the sources

No named source held this one up — that absence is part of the verdict.