No abstract

The effect of EMG biofeedback-assisted relaxation on blood pressure and selected biochemical parameters was evaluated in 38 patients with essential hypertension. Training consisted of 8 weeks of biofeedback and home practice of relaxation exercises. Mean blood pressure decreased in the experimental group from 144/90 to 133/84 mm Hg while the control group remained unchanged. Statistically significant decreases in the experimental group also occurred in muscle tension levels, in plasma aldosterone, and in urinary cortisol. Both aldosterone and cortisol are secreted by the adrenal cortex. It was concluded that the technique taught to the experimental group produced a reduction in skeletal muscle tension and a decrease in stress responding mediated by the adrenal cortex.

Voice onset time (VOT) was measured for voiced and voiceless velar stop consonants across three vowel contexts (/i, a, u/) in healthy young adult and older subjects. Analysis showed that mean VOT values for both /k/ and /g/ across the three vowel contexts did not differ between the two groups; however, differences in VOT variability (standard deviation) approached significance; the older subjects exhibited increased variability. This apparent increase in variability may be related to the subtle anatomical and physiological changes with age.

No abstract

The attitude of 48 pre-and in-service regular and special educators toward teaching the special needs pupil was assessed physiologically via changes in pulse and skin temperature and with self-report. The self-report data were contradicted by the physiological evidence. Statistically significant differences were not observed among the four groups on the self-report measure; however, the physiological index of change in mean pulse rate indicated that preservice regular and special educators, in comparison to experienced teachers, perceived teaching the handicapped child to be significantly more stressful. The lack of agreement between the two assessment procedures was interpreted as suggesting that one should consider cautiously the results of investigations that assess attitude toward the handicapped only by means of self-report.