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Chapter 9d: Trigger Points

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Why Trigger Points Form: Evidenced Based Research (cont’d) Vladamir Janda defined muscles into two primary categories, postural and phasic. Tonic and Phasic Muscle Systems Janda identified two groups of muscles based on their phylogenetic development (Janda 1987). Functionally, muscles can be classified as “tonic” or “phasic”. The tonic system consists of the “flexors,” and is […]