脉冲频率保持恒定的物理工作的性能极限。该频率比静止状态下的测量脉冲高出每分钟约30到35次搏动。工作位置是进行工作所需的位置，例如座位或站立。当超过永久应变极限时，需要恢复周期以达到正常的脉冲频率，以使疲劳或疲劳因子保持尽可能低。

       Performance limit for physical work where the pulse frequency remains constant. This frequency is about 30 to 35 beats per minute above the measured pulse at rest in working position. The working position is the position required for carrying out the work, e.g. seating or standing. When the permanent strain limit is exceeded, recreation periods are required to reach normal pulse frequency, in order to keep fatigue respectively the fatigue factor as low as possible.