Why do my upper back muscles burn when I sit on a tall stool with no back support?
1. Introduction Sitting on a tall stool without back support forces the erector spinae, rhomboids, and trapezius muscles to remain in a constant state of isometric contraction to keep the torso upright against gravity. This sustained muscular tension rapidly depletes local oxygen and adenosine triphosphate reserves, leading to an accumulation of lactic acid that chemically … Read more