A Simple Feedback System for Self-Control of Blood Pressure

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Abstract
A relatively simple, open-loop, feedback system, based on closed-circuit television, which can be used to teach Ss to control their blood pressure is described, along with two experiments which demonstrate its efficacy. In the first experiment 10 normotensive Ss were able to increase systolic blood pressure with the aid of feedback over the level obtainable with the same instructions but without feedback. The second experiment provided a systematic replication of the efficacy of the feedback system. Groups of 13 normotensive Ss for 3 daily 20-min. trials were given either (1) proportional feedback via the new open-loop system or (2) binary feedback of systolic blood pressure on a once per minute basis or (3) were given no feedback but instructions to lower their blood pressure. Results showed a consistent advantage for blood pressure lowering of the new feedback system over binary feedback or no feedback. The latter two did not differ.