Augmentation of Long-Latency-Reflex (LLR)-Amplitudes by Weight Load

Introduction: LLR need voluntary muscle activation to occur. The relation between the level of isometric muscle contraction and LLR-expression has not been sufficiently investigated. Materials and Methods: LLR were recorded over the M. biceps brachii 50ms before and 450ms after the stimulus (12mA, 0.2ms, right N. radialis superficialis; 8 volunteers; averages of 60 traces). Single stimuli and trains of 3 with interstimulus-intervals (ISI) of 3ms were employed at a repetition rate of 1Hz. Statistics: Friedman-ANOVA, Wilcoxon-Test. Results: LLR were present only over the voluntarily activated (90° bent, maximally…