Stress It is well known that stress increases the tension in your muscles. This tension will bring about more pain and pressure, especially when you have an accumulation of waste products that is caused by overburdening certain muscles.
Muscle tension In a lot of occupations repeated actions occur, placing a heavy load on a small muscle or even a muscle group. However, these executed actions only take a small effort. Because of that the heart function doesn't increase. Naturally, an ergonomically designed chair and keyboard are the first requirements for the office staff, but the combination of disproportionate use of a muscle or small muscle group and no extra supply of blood, can nevertheless cause the muscle to become sour and assume a base tone that is too high.