The Senile Posture is the result of both the Red and Green Light reflexes, the two major reflexes triggered by stress, contracting at the same time. Ideally, after a reflex occurs, the body comes back to a neutral position which enables it to seesaw between actions. But that is not what usually happens as we age.
As the repetitions of the Red and Green Light reflexes occur over time, they accumulate, becoming unconscious habit. Gradually they interfere with each other, when one is partially contracted, the other cannot contract fully, which leads to neuromuscular stress. The result is chronic pain and fatigue, because the overlapping contractions of the two reflexes simultaneously activates all of the body's muscle system, which expends an enormous amount of energy. As well, this posture immobilizes the chest, which causes hyperventilation, and the lack of oxygen can lead to depression, listlessness and loss of mental function. Hanna also suggests that the Senile Posture causes chronically high blood pressure due to the static, isometric contraction of the body's two major muscle groups.
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