In a study on the effects of trigger point therapy, there was a significant decrease in heart rate, systolic blood pressure, and diastolic blood pressure. Measures of oxygen consumption, blood pressure, and salivary cortisol levels were all lower after a 10-to-15 minute chair massage in controlled studies. Research shows that massage for nurses during work hours can help to reduce stress and related symptoms, including headaches, shoulder tension, insomnia, fatigue, and muscle and joint pain.