Two scientists were at the beginning of European sport psychology: Angelo Mosso and Philippe Tissie. Angelo Mosso was an Italian who studied the human body. He was also interested in using science to study physical education, exercise, and sport. In his experiments, Mosso found that mental work causes weakness of the muscles. He also found that physical work causes weakness in mental performance. In 1894, Mosso conducted an experiment with his brother, Ugolino Mosso. He had ten Italian Mountain soldiers climb to the top of the mountain and live in a hut for ten days. He also had them perform physical exercises. There are two parts of his results that are related to sports psychology. The first one is called the pioneer effect. The pioneer effect is when in mountain climbing, the person who is leading the group will be more tired than all the others. The second is called the rivaling effect. The rivaling effect is when the soldiers, especially in periods of boredom, would begin to compete with each other in their weight lifting tests. Philippe Tissie viewed sports as a way to treat mental disorders. He published several articles between 1894 and 1909. These articles talked about how sports could help people with mental disorders. He thought that a combination of sports, gymnastics, and psychology could help people with mental disorders. He also thought that playing in too many sports could cause people to have mental disorders and behavioral problems.