From Nicole.: Why do I get #$%^&*# sore TWO DAYS after a workout?
Delayed onset muscle soreness (DOMS) is the pain, tenderness, and stiffness (as in I can’t fucking sit down without dying!) felt in muscles after an especially challenging workout or after working your muscles in a way that is not customary. The discomfort is frequently at its height 24 to 72 hours after the offending workout and the pain is usually felt only when the muscle is stretched, contracted, or put under pressure, not when it is at rest. After 72 hours the pain subsides and generally disappears less than seven days after exercise. Okay we know it feels sucky but what causes it. One theory is that it’s due to eccentric exercise (i.e., the phase of a movement during which the muscle is lengthening such as the “downward” portion of a squat jump). This type of exercise theoretically results in micro tears to the muscles. The muscles then adapt quickly to prevent serious damage and the result is soreness if the exercise is repeated as it is in Beast ad infinitum. You’re welcome. Another theory is that an accumulation of calcium in the damaged muscles sets off a complex chemical reaction leading to inflammation and ultimately pain. By the way, DOMS was first described in 1902 by Theodore Hough who concluded that this kind of soreness is “fundamentally the result of ruptures within the muscle.” Nice going Theo.