Effect of relaxation therapy on post-myocardial infarction patients' rehabilitation.

This research measured the physical and psychosocial effects of the practice of Benson's relaxation technique by male postmyocardial infarction patients enrolled in a cardiac rehabilitation program and determined if the patient's behavioral style (Type A or Type B) was related to the outcomes. Twenty-seven subjects completed the experimental condition; 30, the control condition. Outcome measures included blood pressure, heart rate, aerobic conditioning level (MET level), and psychosocial functioning, as measured by the Sickness Impact Profile. Repeated measures analysis of variance was used to determine if relaxation therapy and/or behavior style had an effect on measures of the effectiveness of cardiac rehabilitation. The practice of relaxation was found to have a significant effect on diastolic blood pressure. Behavior style was unrelated to the outcome measures.

Circulatory effects of mental stress during exercise in coronary artery disease patients.

We examined the effects of mental stress during steady-state exercise on heart rate, blood pressure, pressure-rate product, and oxygen uptake in 10 coronary artery disease patients. Subjects walked at three mph with grade increases of 4% every two minutes until the target heart rate (60% peak heart rate from a previous symptom-limited exercise test) was reached. A computerized Stroop-Color-Word Test (mental stress) was added one minute after the subject reached steady-state exercise and lasted 11 +/- 4 minutes. When mental stress was added to steady-state exercise it significantly (p less than 0.01) increased the heart rate (101 +/- 15 to 108 +/- 19 beats per min), systolic (154 +/- 26 to 170 +/- 26 mmHg) and diastolic (86 +/- 10 to 92 +/- 13 mmHg) blood pressure, and pressure-rate product (158 +/- 42 to 179 +/- 48 x 10(-2)). This increase in the mean response during exercise and mental stress was not observed for oxygen uptake (17 +/- 6 to 18 +/- 5 ml/kg/min). The circulatory changes probably reflect increased sympathetic activity with both centrally mediated cardioacceleratory (and probably cardiac output) and vasoconstrictor effects during the combination of mental stress and steady-state exercise. The altered hemodynamics without concomitant changes in oxygen uptake has major implications concerning the safety of competitive exercise for people with coronary artery disease.

Acoustics in human communication: evolving ideas about the nature of speech.

This paper discusses changes in attitude toward the nature of speech during the past half century. After reviewing early views on the subject, it considers the role of speech spectrograms, speech articulation, speech perception, messages and computers, and the nature of fluent speech.