Or, maybe you’ve reached up to grab something off a shelf or put your carry-on luggage in an overhead bin and felt a tightness or twinge across the top of your back. That sensation was likely coming ...

Active MTrPs were found in the infraspinatus muscle in 56 subjects and in the upper trapezius muscle in 42 subjects. In addition, active MTrPs were highly prevalent in the middle trapezius (n = 31), ...