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Effect of Dual-Tasking on Dynamic Postural Control in Individuals With and Without Nonspecific Low Back Pain Publisher Pubmed



Sherafat S1 ; Salavati M1 ; Takamjani IE2 ; Akhbari B1 ; Mohammadi Rad S1 ; Mazaheri M3 ; Negahben H4 ; Lali P5
Authors
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Authors Affiliations
  1. 1. Physiotherapy Department, University of Social Welfare and Rehabilitation Sciences, Evin, Tehran, Daneshjoo Blvd, Iran
  2. 2. Physiotherapy Department, Rehabilitation Faculty, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Musculoskeletal Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
  5. 5. Amirkabir University of Technology, Tehran, Iran

Source: Journal of Manipulative and Physiological Therapeutics Published:2014


Abstract

Objective The purpose of this study was to compare the effect of dual tasking on postural and cognitive performance between participants with and without nonspecific chronic low back pain. Methods In this 3-factor mixed-design study, dynamic postural stability was assessed in 15 patients with chronic nonspecific low back pain and 15 age-, sex-, and size-matched asymptomatic participants. Bilateral stance on a Biodex Balance System was investigated at 3 levels of postural task difficulty (different platform stabilities levels with eyes open and closed) and 2 levels of cognitive task difficulty (with or without auditory Stroop test). We measured anterior-posterior, medial-lateral, and overall indices for postural performance. Average reaction time and error ratio of a modified auditory Stroop test were calculated as measures of the cognitive task performance. Results Mixed-design 3-way analyses of variance revealed significant interactions. Post hoc 2-way analyses of variance showed significant group by cognitive task difficulty for anterior-posterior (P <.001), medial-lateral (P =.003), and overall stability indices (P <.001) on a stiffness level of 5 with eyes closed. At this level, there were significant differences between single- and dual-task conditions for anterior-posterior (P <.001), medial-lateral (P =.02), and overall stability indices (P <.001) only in the chronic low back pain group. Also, at the most difficult postural conditions, participants with chronic low back pain increased their error ratio (P =.002), whereas matched asymptomatic individuals increased their reaction time (P <.01) of the auditory Stroop test. Conclusion Postural task performance is attenuated by cognitive loading at a moderate level of postural task difficulty. Therefore, to observe the effect of attentional demands of postural control, task difficulty should be considered. © 2014 National University of Health Sciences.
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