Figure 3. Cardiovascular response to sustained passive stretch of triceps surae.
Computer plots of heart rate (A), mean blood pressure (B) and respiratory movements (C). Between the vertical lines the foot was passively dorsiflexed with an angle of rotation of 60 deg and this stretch was maintained for 1 min. The DC shift in the trace in C was due to a small passive movement of the thorax when the foot was rotated. Trace is from one subject.