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Article: Changes in limb stiffness under conditions of mental stress

TitleChanges in limb stiffness under conditions of mental stress
Authors
Issue Date2001
PublisherRoutledge. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/00222895.asp
Citation
Journal Of Motor Behavior, 2001, v. 33 n. 2, p. 153-164 How to Cite?
AbstractIn 2 experiments, the effects of mental stress on limb stiffness were investigated. The relative contribution to arm stiffness of individual muscle activity, co-contraction, muscle reflexes, and postural adjustments were examined. In each experiment, participants (N = 24, Experiment 1; N = 16, Experiment 2) held their supinated hand under a tray that they were required to return to horizontal after it had been suddenly released. Electromyographic activity in the biceps and triceps muscles was recorded, as were elbow and wrist angles and tray displacement. In Experiment 1, mental arithmetic stress was shown to lead to decreased tray displacement (i.e., increased resistance) compared with displacements under the control, unstressed condition, as well as to increased elbow flexion before tray release. In Experiment 2, the increased resistance to perturbation caused by mental stress was found to be independent of initial elbow angle, but to vary as a function of the amount of upward force exerted before tray release. The authors conclude that stress-induced increases in limb stiffness result from changes in the initial position of the elbow, specified by its angle, together with the initial force exerted by participants to counteract the mechanical perturbations.
Persistent Identifierhttp://hdl.handle.net/10722/176015
ISSN
2015 Impact Factor: 1.573
2015 SCImago Journal Rankings: 0.733
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorVan Loon, EMen_US
dc.contributor.authorMasters, RSWen_US
dc.contributor.authorRing, Cen_US
dc.contributor.authorMcintyre, DBen_US
dc.date.accessioned2012-11-26T09:04:32Z-
dc.date.available2012-11-26T09:04:32Z-
dc.date.issued2001en_US
dc.identifier.citationJournal Of Motor Behavior, 2001, v. 33 n. 2, p. 153-164en_US
dc.identifier.issn0022-2895en_US
dc.identifier.urihttp://hdl.handle.net/10722/176015-
dc.description.abstractIn 2 experiments, the effects of mental stress on limb stiffness were investigated. The relative contribution to arm stiffness of individual muscle activity, co-contraction, muscle reflexes, and postural adjustments were examined. In each experiment, participants (N = 24, Experiment 1; N = 16, Experiment 2) held their supinated hand under a tray that they were required to return to horizontal after it had been suddenly released. Electromyographic activity in the biceps and triceps muscles was recorded, as were elbow and wrist angles and tray displacement. In Experiment 1, mental arithmetic stress was shown to lead to decreased tray displacement (i.e., increased resistance) compared with displacements under the control, unstressed condition, as well as to increased elbow flexion before tray release. In Experiment 2, the increased resistance to perturbation caused by mental stress was found to be independent of initial elbow angle, but to vary as a function of the amount of upward force exerted before tray release. The authors conclude that stress-induced increases in limb stiffness result from changes in the initial position of the elbow, specified by its angle, together with the initial force exerted by participants to counteract the mechanical perturbations.en_US
dc.languageengen_US
dc.publisherRoutledge. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/00222895.aspen_US
dc.relation.ispartofJournal of Motor Behavioren_US
dc.subject.meshAdulten_US
dc.subject.meshArm - Physiopathologyen_US
dc.subject.meshArousal - Physiologyen_US
dc.subject.meshElectromyography - Methodsen_US
dc.subject.meshFemaleen_US
dc.subject.meshHeart Rate - Physiologyen_US
dc.subject.meshHumansen_US
dc.subject.meshMaleen_US
dc.subject.meshMuscle Contraction - Physiologyen_US
dc.subject.meshMuscle, Skeletal - Physiopathologyen_US
dc.subject.meshPosture - Physiologyen_US
dc.subject.meshReflex, Stretch - Physiologyen_US
dc.subject.meshStress, Psychological - Physiopathology - Psychologyen_US
dc.titleChanges in limb stiffness under conditions of mental stressen_US
dc.typeArticleen_US
dc.identifier.emailMasters, RSW: mastersr@hku.hken_US
dc.identifier.authorityMasters, RSW=rp00935en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1080/00222890109603147-
dc.identifier.pmid11404211-
dc.identifier.scopuseid_2-s2.0-0035009022en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0035009022&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume33en_US
dc.identifier.issue2en_US
dc.identifier.spage153en_US
dc.identifier.epage164en_US
dc.identifier.isiWOS:000168905700004-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridVan Loon, EM=36948374200en_US
dc.identifier.scopusauthoridMasters, RSW=7102880488en_US
dc.identifier.scopusauthoridRing, C=7006494007en_US
dc.identifier.scopusauthoridMcIntyre, DB=7102663995en_US

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