While stepping at your heart rate is necessary in order to achieve natural counterpulsation, it’s not enough. Counterpulsation requires that you step precisely during the early relaxation phase of your heart’s pump cycle. Counterpace sensors ensure the that each step cycle is phase synchronized with the heart’s constantly changing pump timing. If you step at your heart rate without Counterpace guidance, you may inadvertently repeatedly step when the heart is contracting. This highly unfavorable “systolic step timing” has been shown to dramatically increase systolic and mean blood pressure and heart rate, while recent evidence suggests it may simultaneously decrease both skeletal and heart muscle oxygen delivery.