Fig. 1From: Qualitative ultrasonography scale of the intensity of local twitch response during dry needling and its association with modified joint range of motion: a cross-sectional studyExperimental setup and data normalization. a Filament needle inserted into muscle trigger points while keeping the ultrasound transducer fixed. b Regions of interest (ROI) positioned on deep aponeurosis. Medial gastrocnemius (MG). c Example of signal velocity of one local twitch responsesBack to article page