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. 2017 Sep 13;119(1):5–20. doi: 10.1152/jn.00362.2017

Fig. 4.

Fig. 4.

Identification of stretch reflex thresholds during passive stretching of elbow flexors. A: spastic muscle (Brachioradialis (BR)) begins to be activated (arrow) during passive stretching above a certain, velocity-dependent joint angle (DSRT). Triceps brachii (TB) was shortening during the passive elbow extension. B: tonic stretch reflex threshold (TSRT) at which spasticity begins to be manifested is determined from linear regression across DSRT points (TSRT = DSRT at zero velocity).