Well, muscle tension can stem from various factors like stress, over-exertion, dehydration, and more. It can feel like an ache or discomfort, coupled with a sense of tightness. Chronic muscle ...

Isotonic contraction – involves the muscle producing tension and controlling the speed of the muscular contraction. This movement can be a concentric or eccentric muscular contraction.

Isotonic eccentric contraction – this involves the muscle lengthening whilst it is under tension. The origin and the insertion move further away from each other. An eccentric contraction ...

muscle tension, or posture or eyestrain. But instead of coping in silence, try slowly massaging your temples and working your way along your hair line until they meet in the center of your forehead.

This article explains how tight neck, shoulder and upper back muscles cause tension headaches to become a chronic condition. It's an excerpt from the author's "How to Get Permanent Relief From ...