Brain activation by central command during actual and imagined handgrip under hypnosis

J. W. Williamson, R. McColl, D. Mathews, J. H. Mitchell, P. B. Raven, W. P. Morgan

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

The purpose was to compare patterns of brain activation during imagined handgrip exercise and identify cerebral cortical structures participating in "central" cardiovascular regulation. Subjects screened for hypnotizability, five with higher (HH) and four with lower hypnotizability (LH) scores, were tested under two conditions involving 3 min of 1) static handgrip exercise (HG) at 30% of maximal voluntary contraction (MVC) and 2) imagined HG (I-HG) at 30% MVC. Force (kg), forearm integrated electromyography, rating of perceived exertion, heat rate (HR), mean blood pressure (MBP), and differences in regional cerebral blood flow distributions were compared using an ANOVA. During HG, both groups showed similar increases in HR (+13 ± 5 beats/min) and MBP (+17 ± 3 mmHg) after 3 min. However, during I-HG, only the HH group showed increases in HR (+10 ± 2 beats/min; P < 0.5) and MBP (+12 ± 2 mmHg; P < 0.05). There were no significant increases or differences in force or integrategrated electromyographic activity between groups during I-HG. The rating of perceived exertion was significantly increased for the HH group during I-HG, but not for the LH group. In comparison of regional cerebral blood flow, the LH showed significantly lower activity in the anterior cingulate (-6 ± 2%) and insular cortexes (-9 ± 4%) during I-HG. These findings suggest that cardiovascular responses elicited during imagined exercise involve central activation of insular and anterior cingulate cortexes, independent of muscle afferent feedback; these structures appear to have key roles in the central modulation of cardiovascular responses.

Original languageEnglish (US)
Pages (from-to)1317-1324
Number of pages8
JournalJournal of Applied Physiology
Volume92
Issue number3
StatePublished - 2002

Fingerprint

Hypnosis
Cerebrovascular Circulation
Hot Temperature
Gyrus Cinguli
Regional Blood Flow
Blood Pressure
Brain
Electromyography
Forearm
Cerebral Cortex
Analysis of Variance
Muscles

Keywords

  • Autonomic nervous system
  • Human
  • Imagery
  • Magnetic resonance imaging
  • Single-photon-emission computed tomography

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Brain activation by central command during actual and imagined handgrip under hypnosis. / Williamson, J. W.; McColl, R.; Mathews, D.; Mitchell, J. H.; Raven, P. B.; Morgan, W. P.

In: Journal of Applied Physiology, Vol. 92, No. 3, 2002, p. 1317-1324.

Research output: Contribution to journalArticle

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