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Which involves the most muscular effort:

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frowns or smiles?

 

For more use the DOOR.

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   According to HUMAN, p.69 (DK Ltd.,The Smithsonian Institution, 2006), it’s about the same. “It is a popularly held belief that a person uses twice as many facial muscles to frown…as to smile. In fact, determining which facial muscles are important in facial expressions is difficult, since many make only minor contributions, depending on the intensity of expression. Surgeons and researchers at the University of Chicago in the U.S. have concluded, however, the frowning uses 11 important facial muscles, while smiling uses 12.”

   The interplay of muscles, nerves, and “feelings” such as emotions is mind-boggling.