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Biomedical subjects

E Magnusson

Publications and source records attributed to E Magnusson.

4 recordsLinked to original sources
PubMed1979

Physiological response patterns during "intake" and "rejection" tasks.

Two 2-min tasks, one requiring outer-directed attention (intake task), the other a mental arithmetic task (rejection task) were presented to 20 subjects. According to Lacey the distinguishing feature of the response to intake tasks are cardiac deceleration and blood pressure decreases. None of these responses was obtained. Some variables, however, were only affected by one of the tasks; the intake task led to a decreased hand (skin) blood flow and an increased hand vascular resistance, whereas a heart rate acceleration and increased forearm (muscle) blood flow and decreased forearm vascular resistance were observed during the rejection task. Blood pressure, respiration rate and skin conductance were similarly affected by the two tasks. Inconsistencies among previous studies of the response to the two types of tasks were discussed and found to be partially explained by methodological differences.

Adult↗
PubMed1976

The effects of controlled muscle tension on performance and learning of heart-rate control.

Thirty female subjects were divided in three groups and instructed in group I to increase their HRs with the aid of continuous feedback of performance, while they tensed their right forearm muscles 20% of maximal voluntary contraction. In the last session only feedback was used, Group II were trained with feedback only. Group III for the first two sessions tensed their muscles only, and in the last session trained HR increases with feedback only. Group I was superior in HR performance in the first two sessions. In the third session they deteriorated significantly and could not be distinguished from the other two groups. The results were interpreted in terms of relations between somatic and autonomic events and transfer between different states of somatic involvement during learning. Electrodermal activity and respiration were included as control variables.

Adult↗