Imagine constantly idling that car with bad mileage. The combination of constant and inefficient use of muscle energy makes you burn nutrients faster than they can be replaced and builds up painful waste products like lactic acid. Even at rest, fibromyalgia muscles show the level of lactic acid you would expect in someone who has run a 5K race (Gerdle 2010). Nonstop muscle tension is equivalent to nonstop exercise. No wonder we’re tired and our muscles hurt!
