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Effectuation of adaptive stability and postural alignment strategies are decreased by alcohol intoxication.

Hafström, Anna LU ; Modig, Fredrik LU ; Magnusson, Måns LU and Fransson, Per-Anders LU (2014) In Human Movement Science 35(Apr 29). p.30-49
Abstract
Human stability control is a complex process comprising contributions from several partly independent mechanisms such as coordination, feedback and feed-forward control, and adaptation. Acute alcohol intoxication impairs these functions and is recognized as a major contributor to fall traumas. The study aimed to investigate how alcohol intoxication at .06% and .10% blood alcohol concentration (BAC) affected the movement spans and control of posture alignment. The angular positions of the head, shoulder, hip and knees relative to the ankles were measured with a 3D motion analysis system in 25 healthy adults during standing with eyes open or closed and with or without vibratory balance perturbations. Alcohol intoxication significantly... (More)
Human stability control is a complex process comprising contributions from several partly independent mechanisms such as coordination, feedback and feed-forward control, and adaptation. Acute alcohol intoxication impairs these functions and is recognized as a major contributor to fall traumas. The study aimed to investigate how alcohol intoxication at .06% and .10% blood alcohol concentration (BAC) affected the movement spans and control of posture alignment. The angular positions of the head, shoulder, hip and knees relative to the ankles were measured with a 3D motion analysis system in 25 healthy adults during standing with eyes open or closed and with or without vibratory balance perturbations. Alcohol intoxication significantly increased the movement spans of the head, shoulders, hip and knees in anteroposterior and lateral directions during quiet stance (p⩽.047 and p⩽.003) and balance perturbations (p<.001, both directions). Alcohol intoxication also decreased the ability to reduce the movement spans through adaptation in both anteroposterior (p⩽.011) and lateral (p⩽.004) directions. When sober and submitted to balance perturbations, the subjects aligned the head, shoulders, hip and knees more forward relative to the ankle joint (p<.001), hence adopting a more resilient posture increasing the safety margin for backward falls. Alcohol intoxication significantly delayed this forward realignment (p⩽.022). Alcohol intoxication did not cause any significant posture realignment in the lateral direction. Thus, initiation of adaptive posture realignments to alcohol or other disruptions might be context dependent and associated with reaching a certain level of stability threats. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Human Movement Science
volume
35
issue
Apr 29
pages
30 - 49
publisher
Elsevier
external identifiers
  • pmid:24792362
  • wos:000338814300003
  • scopus:84899678629
ISSN
1872-7646
DOI
10.1016/j.humov.2014.03.011
language
English
LU publication?
yes
id
56d27895-c378-4e78-8ce5-78b689247a69 (old id 4455933)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/24792362?dopt=Abstract
date added to LUP
2014-06-03 18:46:32
date last changed
2017-03-26 03:03:49
@article{56d27895-c378-4e78-8ce5-78b689247a69,
  abstract     = {Human stability control is a complex process comprising contributions from several partly independent mechanisms such as coordination, feedback and feed-forward control, and adaptation. Acute alcohol intoxication impairs these functions and is recognized as a major contributor to fall traumas. The study aimed to investigate how alcohol intoxication at .06% and .10% blood alcohol concentration (BAC) affected the movement spans and control of posture alignment. The angular positions of the head, shoulder, hip and knees relative to the ankles were measured with a 3D motion analysis system in 25 healthy adults during standing with eyes open or closed and with or without vibratory balance perturbations. Alcohol intoxication significantly increased the movement spans of the head, shoulders, hip and knees in anteroposterior and lateral directions during quiet stance (p⩽.047 and p⩽.003) and balance perturbations (p&lt;.001, both directions). Alcohol intoxication also decreased the ability to reduce the movement spans through adaptation in both anteroposterior (p⩽.011) and lateral (p⩽.004) directions. When sober and submitted to balance perturbations, the subjects aligned the head, shoulders, hip and knees more forward relative to the ankle joint (p&lt;.001), hence adopting a more resilient posture increasing the safety margin for backward falls. Alcohol intoxication significantly delayed this forward realignment (p⩽.022). Alcohol intoxication did not cause any significant posture realignment in the lateral direction. Thus, initiation of adaptive posture realignments to alcohol or other disruptions might be context dependent and associated with reaching a certain level of stability threats.},
  author       = {Hafström, Anna and Modig, Fredrik and Magnusson, Måns and Fransson, Per-Anders},
  issn         = {1872-7646},
  language     = {eng},
  number       = {Apr 29},
  pages        = {30--49},
  publisher    = {Elsevier},
  series       = {Human Movement Science},
  title        = {Effectuation of adaptive stability and postural alignment strategies are decreased by alcohol intoxication.},
  url          = {http://dx.doi.org/10.1016/j.humov.2014.03.011},
  volume       = {35},
  year         = {2014},
}