Fig. 2.

Peak-to-peak reflex responses of the soleus. Comparison of normalized reflex amplitudes of HP (66.20 ± 4.34% MSR), JM (68.40 ± 5.29% MSR), R (51.12 ± 5.72% MSR), and TC (65.16 ± 6.51% MSR) in the soleus. There are significant differences between HP and R, JM and R, and TC and R. ^*p < 0.01667; ^**p = 0.017 (on the significance limit). Standard errors are shown. The reflex amplitudes are normalized against the maximum stretch reflex response for that subject. R indicates rest; TC indicates teeth clench, which consists of biting on an individualized mouth guard with maximal force; HP indicates clenched hand pull, which consists of trying to pull the hands apart against interlocked fingers; and JM indicates a specified Jendrassik maneuver, which consists of both clenched hand pull and teeth clench.