Additionally, experimentally induced pain produced through injection of hypertonic saline directly into the upper, middle, and lower divisions of the trapezius in otherwise healthy subjects, resulted in decreased upper trapezius and increased lower trapezius activation on the painful side and increased trapezius activation on the contralateral side during repetitive bilateral flexion (research here). Further investigation of the influence of induction or removal of pain and the relationships between pain state, muscle activation, and kinematics is needed.
From our perspective, thankfully, knowing the relationship between pain and weakness/muscle control deficits up and down the kinetic chain is enough. That knowledge, in combination with a standardized movement assessment allows us to differentiate true weakness from altered muscle control and adds precision to our treatment paradigm in treating a multitude of movement impairments, including painful conditions. Treatment efficiency is the direction healthcare is moving. We are enthusiastic about empowering patients to manage their symptoms as soon as possible, to expedite painless return to activity and improved quality of life.