Figure 7. Steady-state force enhancement (FE) following muscle stretch.

Steady-state force enhancement values were pooled for each stretch condition and across all subjects. A, Protocol 1: the steady-state force enhancement following 20 and 30 deg stretches was significantly greater than that following 10 deg stretches for the tests using electrical stimulation. Force enhancement was greatest following 20 deg of stretch for the voluntary contractions. Significance (* P < 0.05) is presented separately for electrically induced (continuous line) and for voluntary (dashed line) contractions because a significant interaction (stimulation method × stretch condition) was found. B, Protocol 2: force enhancement was not influenced by the speed of stretch regardless of the method of stimulation. FE: force enhancement following muscle stretching.