For Michelet, the Renaissance was more a development in science than in art and culture. He asserted that it spanned the period from Columbus to Copernicus to Galileo; that is, from the end of the 15th century to the middle of the 17th century.
Other researchers believe that side stitches are caused by stretching the ligaments that extend from the diaphragm to the liver. When a runner or walker pounds the surface while breathing in and out, he or she stretches these ligaments, and that causes the pain.
Gait disturbances can cause tendonitis. Walking or running incorrectly due to muscle imbalances or joint dysfunctions caused by another injury or from wearing improper footwear can result in tendon problems. What you put on your feet will have a dramatic effect on your entire body â not just your feet.