Lee R M, Caldwell J R, Lee J A
Biofeedback Self Regul. 1977 Dec;2(4):435-47. doi: 10.1007/BF00998628.
Two automatic electronic systems for tracking diastolic or systolic blood pressure (BP) and their use in biofeedback experiments are described. Both systems are based on the use of an arm cuff and the recording of Korotkoff sounds with a microphone. An electronic control system receives input from the microphone and provides output to several solenoid valves that control compressed airflow to the cuff. For one of the tracking systems we devised, the cuff is alternately inflated for 45 sec and deflated for 45 sec. During inflation, small increments and decrements in cuff pressure, based on the occurrence of Korotkoff sounds, are used to track BP. The other tracking system is slower but provides more continuous measurements: The cuff is alternately inflated to approximately the BP level for 5 sec and then deflated for 5 sec. During each inflation, the number of Korotkoff sounds is recorded by the system and according to this number, the amount of inflation on the next trial is automatically adjusted so that the cuff pressure follows BP. Both systems have been used successfully in biofeedback applications.
本文描述了两种用于跟踪舒张压或收缩压（BP）的自动电子系统及其在生物反馈实验中的应用。这两种系统均基于使用手臂袖带并通过麦克风记录柯氏音。电子控制系统接收来自麦克风的输入，并向几个电磁阀提供输出，这些电磁阀控制流向袖带的压缩气流。对于我们设计的其中一种跟踪系统，袖带交替充气45秒和放气45秒。在充气过程中，根据柯氏音的出现，袖带压力的小幅度增减用于跟踪血压。另一种跟踪系统速度较慢，但能提供更连续的测量：袖带交替充气至约血压水平5秒，然后放气5秒。在每次充气过程中，系统记录柯氏音的数量，并根据该数量自动调整下一次试验的充气量，以使袖带压力跟踪血压。这两种系统均已成功应用于生物反馈应用中。
