Our study has found that epicatechin seems to bring about the same response - particularly in the heart and skeletal muscles, "he said.

Though the technology is being introduced to pick up heart signals, EPIC's developers say it is also good at sensing the electrical activity of skeletal muscles, including those that control the eyes.

As you age, a number of changes occur in your skeletal muscles, which are the ones that move your arms, your legs and the rest of your body. You lose muscle mass — you simply have less of the stuff.