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Figure 4.   An Illustration of a Hypothetical Gradual Transition of Myofascial Pain to Chronicity Over Time

Total muscle strength (green); threshold muscle load beyond which motor unit relaxation time falls below a critical value and an energy crisis occurs (red); actual load on the muscle (blue). Myofascial pain episodes occur when the muscle load exceeds the threshold load (arrows). These episodes increase in frequency as a muscle weakens, and eventually even low, everyday loads exceed the declining threshold, and chronicity ensues.

RMMJ Rambam Maimonides Medical Journal Rambam Health Care Campus 2018 July; 9(3): e0021. ISSN: 2076-9172
Published online 2018 July 30. doi: 10.5041/RMMJ.10336