Sometimes when your calcium/magnesium ratio is off, you can get twitching. I get one in my diaphram that feels like a fish flopping in my chest. If you are low in calcium intake, or very low in magnesium, the muscles do a dance of sorts. So you could try to balance that out.
(February 2017) A concrete slab is a common structural element of modern buildings. Horizontal slabs of steel reinforced concrete, typically between 4 and 20 inches (100 and 500 millimeters) thick, are most often used to construct floors and ceilings, while thinner slabs are also used for exterior paving.
Thin Slab Radiant Heat Systems. There are several methods of installing hydronic radiant heat systems over a conventional wood-framed floor. One of the most common is called a thin slab system. Thin slabs consist of either a specially formulated concrete or poured gypsum underlayment. Both types of slabs have installation requirements that must be carefully coordinated with the building design process.