Key result
Local EMG reflex amplitudes correlated well with corresponding local fiber stretch velocities (R values ranging from 0.5 to 0.8) but not with whole muscle stretch velocity in cats.
Effect estimate: R 0.5 to 0.8
Changes in local muscle fiber length represent the mechanical input to spindles better than changes in total muscle length, indicating a specific role for spindles in reflex activation of nearby muscle fibers.
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May refine spindle reflex models using local fiber measures; leaves open translation beyond feline data.
Eng et al. (1997) studied this question. Ankle rotations was evaluated on Correlation between local EMG reflex amplitudes and local fiber stretch velocities (R 0.5 to 0.8). Local EMG reflex amplitudes correlated well with corresponding local fiber stretch velocities (R values ranging from 0.5 to 0.8) but not with whole muscle stretch velocity in cats.
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