Exercise induced nausea is a feeling of sickness or vomiting which can occur shortly after exercise has stopped as well as during exercise itself. It may be a symptom of either over exertion during exercise, or from too abruptly ending an exercise session. People engaged in high intensity exercise such as aerobics and bicycling have reported suffering from exercise induced nausea. A study of 20 volunteers conducted at Nagoya University, Japan associated a higher degree of exercise induced nausea after eating. It has been suggested that exercise induced nausea could be caused by increased endorphin levels, which are released while exercising. Endorphins have been associated with nausea and vomiting, so this theory is plausible, but unsupported by evidence.