It was towards the end of the 17th century that the word stress came to assume a technical meaning through the writing of English natural philosopher, architect and universal genius Robert Hooke. Hooke’s work was, among his many areas of interest, focused on how bridges and other man-made structures could be made larger and capable of bearing heavy loads without collapsing.
It is thanks to Hooke’s law of elasticity (1675) that the words load (the demand placed on the structure), stress (the area affected by the demand), and strain (the change in form that results from the interaction between load and stress) came into usage.
The study of stresses and tension (another word generated within this context) eventually produced the idea that the workings and architecture of the human body were much like the machines and structures that were being invented and constructed during this time. This idea spawned another idea that profoundly influenced the way we think about stress. The idea followed the concept of the body as a machine to its logical conclusion: If mechanical structures are subject to wear and tear, and the body is built and behaves in a similar fashion, then so would the body suffer the impact of the wear and tear of life.