Loss of balance during balance beam walking elicits a multifocal theta band electrocortical response
Identifieur interne : 002855 ( Ncbi/Merge ); précédent : 002854; suivant : 002856Loss of balance during balance beam walking elicits a multifocal theta band electrocortical response
Auteurs : Amy R. Sipp [États-Unis] ; Joseph T. Gwin [États-Unis] ; Scott Makeig [États-Unis] ; Daniel P. Ferris [États-Unis]Source :
- Journal of Neurophysiology [ 0022-3077 ] ; 2013.
Abstract
Determining the neural correlates of loss of balance during walking could lead to improved clinical assessment and treatment for individuals predisposed to falls. We used high-density electroencephalography (EEG) combined with independent component analysis (ICA) to study loss of balance during human walking. We examined 26 healthy young subjects performing heel-to-toe walking on a treadmill-mounted balance beam as well as walking on the treadmill belt (both at 0.22 m/s). ICA identified clusters of electrocortical EEG sources located in or near anterior cingulate, anterior parietal, superior dorsolateral-prefrontal, and medial sensorimotor cortex that exhibited significantly larger mean spectral power in the theta band (4–7 Hz) during walking on the balance beam compared with treadmill walking. Left and right sensorimotor cortex clusters produced significantly less power in the beta band (12–30 Hz) during walking on the balance beam compared with treadmill walking. For each source cluster, we also computed a normalized mean time/frequency spectrogram time locked to the gait cycle during loss of balance (i.e., when subjects stepped off the balance beam). All clusters except the medial sensorimotor cluster exhibited a transient increase in theta band power during loss of balance. Cluster spectrograms demonstrated that the first electrocortical indication of impending loss of balance occurred in the left sensorimotor cortex at the transition from single support to double support prior to stepping off the beam. These findings provide new insight into the neural correlates of walking balance control and could aid future studies on elderly individuals and others with balance impairments.
Url:
DOI: 10.1152/jn.00744.2012
PubMed: 23926037
PubMed Central: 3841925
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<front><div type="abstract" xml:lang="en"><p>Determining the neural correlates of loss of balance during walking could lead to improved clinical assessment and treatment for individuals predisposed to falls. We used high-density electroencephalography (EEG) combined with independent component analysis (ICA) to study loss of balance during human walking. We examined 26 healthy young subjects performing heel-to-toe walking on a treadmill-mounted balance beam as well as walking on the treadmill belt (both at 0.22 m/s). ICA identified clusters of electrocortical EEG sources located in or near anterior cingulate, anterior parietal, superior dorsolateral-prefrontal, and medial sensorimotor cortex that exhibited significantly larger mean spectral power in the theta band (4–7 Hz) during walking on the balance beam compared with treadmill walking. Left and right sensorimotor cortex clusters produced significantly less power in the beta band (12–30 Hz) during walking on the balance beam compared with treadmill walking. For each source cluster, we also computed a normalized mean time/frequency spectrogram time locked to the gait cycle during loss of balance (i.e., when subjects stepped off the balance beam). All clusters except the medial sensorimotor cluster exhibited a transient increase in theta band power during loss of balance. Cluster spectrograms demonstrated that the first electrocortical indication of impending loss of balance occurred in the left sensorimotor cortex at the transition from single support to double support prior to stepping off the beam. These findings provide new insight into the neural correlates of walking balance control and could aid future studies on elderly individuals and others with balance impairments.</p>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">J Neurophysiol</journal-id>
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<title-group><article-title>Loss of balance during balance beam walking elicits a multifocal theta band electrocortical response</article-title>
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<contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Sipp</surname>
<given-names>Amy R.</given-names>
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<xref ref-type="aff" rid="aff1"><sup>1</sup>
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<xref ref-type="aff" rid="aff1"><sup>1</sup>
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<xref ref-type="aff" rid="aff2"><sup>2</sup>
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Human Neuromechanics Laboratory, University of Michigan, Ann Arbor, Michigan; and</aff>
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Swartz Center for Computational Neuroscience, University of California, San Diego, California</aff>
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<author-notes><corresp id="cor1">Address for reprint requests and other correspondence: A. R. Sipp, <addr-line>School of Kinesiology, 401 Washtenaw Ave., Ann Arbor, MI 48109</addr-line>
(e-mail: <email>amysipp@umich.edu</email>
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<pub-date pub-type="epub"><day>7</day>
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<pmc-comment> PMC Release delay is 12 months and
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<volume>110</volume>
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<lpage>2060</lpage>
<history><date date-type="received"><day>24</day>
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<date date-type="accepted"><day>2</day>
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<permissions><copyright-statement>Copyright © 2013 the American Physiological Society</copyright-statement>
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<copyright-holder>American Physiological Society</copyright-holder>
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<abstract><p>Determining the neural correlates of loss of balance during walking could lead to improved clinical assessment and treatment for individuals predisposed to falls. We used high-density electroencephalography (EEG) combined with independent component analysis (ICA) to study loss of balance during human walking. We examined 26 healthy young subjects performing heel-to-toe walking on a treadmill-mounted balance beam as well as walking on the treadmill belt (both at 0.22 m/s). ICA identified clusters of electrocortical EEG sources located in or near anterior cingulate, anterior parietal, superior dorsolateral-prefrontal, and medial sensorimotor cortex that exhibited significantly larger mean spectral power in the theta band (4–7 Hz) during walking on the balance beam compared with treadmill walking. Left and right sensorimotor cortex clusters produced significantly less power in the beta band (12–30 Hz) during walking on the balance beam compared with treadmill walking. For each source cluster, we also computed a normalized mean time/frequency spectrogram time locked to the gait cycle during loss of balance (i.e., when subjects stepped off the balance beam). All clusters except the medial sensorimotor cluster exhibited a transient increase in theta band power during loss of balance. Cluster spectrograms demonstrated that the first electrocortical indication of impending loss of balance occurred in the left sensorimotor cortex at the transition from single support to double support prior to stepping off the beam. These findings provide new insight into the neural correlates of walking balance control and could aid future studies on elderly individuals and others with balance impairments.</p>
</abstract>
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