Study design. Participants were 23 females and 18 males with a mean age of 19.6 years (standard deviation 1.5). Muscle activity was measured using surface electromyography and heart period were measured using electrocardiography. The experimental protocol consisted of 3 periods: baseline, tongue placement on the floor of mouth, and tongue placement on palate.
Results. Results indicated significantly more activity in the temporalis and suprahyoid muscle regions as well as a significant reduction in heart rate variability when the tongue was positioned on the palate compared with tongue position on the floor of the mouth.
paper2:
Afterwards, subjects were randomly assigned to conditions requiring them to position the tongue either ”against the anterior palate“ or ”on the floor of the mouth, making sure the tip does not press against any part of the mouth.“ The results indicated that right temporalis activity was higher when the tongue was positioned against the roof of the mouth than when it was either at baseline or resting on the floor of the mouth (P < .03). A similar pattern of results was observed for the suprahyoid muscle group (P < .01).
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其實頭骨有28塊,用肌肉連住,改善返肌肉功能會有D影響,不過大人唔好以為會肉眼好快見到咁
The 28 bones of the human skull never fuse together in a healthy adult, and a restoration of correct muscle function will result in the slow but steady restoration of proper skull form.