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Effects of static forehead and forearm muscle tension on total respiratory resistance in healthy and asthmatic participants

Published online by Cambridge University Press:  01 September 1998

THOMAS RITZ ,
BERNHARD DAHME  and
CLAUS WAGNER
THOMAS RITZ
Affiliation:
Department of Psychology, St. George's Hospital Medical School, University of London, London, UK
BERNHARD DAHME
Affiliation:
Psychological Institute III, University of Hamburg, Hamburg, Germany
CLAUS WAGNER
Affiliation:
Psychological Institute III, University of Hamburg, Hamburg, Germany
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Abstract

The impact of static muscle tension on total respiratory resistance (TRR) was examined. Participants (24 healthy, 24 asthmatic) performed biofeedback-assisted sequences of tensing (15 s) and relaxing (20 s) forehead and forearm muscles. Muscle tension levels were 40% or 80% of the maximum individual force. Oscillatory TRR, electromyograms, ventilation, heart period, and respiratory sinus arrhythmia were recorded. Baseline TRR did not change over the session as a whole. Decreases in TRR during forehead tension in both groups were accompanied by increases in end-expiratory volume, which could have mediated TRR changes. During forearm tension, decreases in TRR with minimal ventilation changes were only observed in healthy participants, whereas asthmatic patients revealed marked increases in respiratory volume and flow. These results indicate that static muscle activity and TRR are negatively related. Ventilatory changes can exaggerate or diminish evidence for this relationship.

Keywords

Static muscle tensionTotal respiratory resistanceAsthmaEMG frontalis
Type
Research Article
Information
Psychophysiology , Volume 35 , Issue 5 , September 1998 , pp. 549 - 562
Copyright
© 1998 Society for Psychophysiological Research

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