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The Relevance of Dual Tasking for Improving Trunk Muscle Endurance After Back Surgery

Published:September 01, 2020DOI:https://doi.org/10.1016/j.apmr.2020.07.015

      Highlights

      • The effect of dual tasking on muscle endurance performance after lumbar diskectomy remains uninvestigated.
      • Compared with single tasking, dual tasking has a positive effect on trunk muscle endurance in patients with lumbar diskectomy.
      • The positive effect of dual tasking is associated with fear avoidance.

      Abstract

      Objective

      To determine the effect of dual tasking on trunk muscle endurance in patients after lumbar diskectomy.

      Design

      Cross-sectional study.

      Setting

      Rehabilitation hospital setting.

      Participants

      Individuals (N=14) undergoing primary lumbar diskectomy.

      Intervention

      Using a randomized design on 2 separate days, muscle endurance was evaluated during prone bridging and Biering-Sorensen tests. Each test was randomly performed under 2 cognitive conditions: single task without cognitive condition and self-regulated dual task (ie, mathematical task).

      Main Outcome Measures

      The primary outcomes were time to failure and pain assessed by the visual analog scale from 0 to 100 mm. The secondary outcomes were kinesiophobia assessed by the Tampa Scale and disability assessed by the Oswestry Disability Index. Associations were tested using a repeated measures analysis of variance with relevant interaction test.

      Results

      A significant interaction between condition, endurance tests, and kinesiophobia (P=.005) was found. The post hoc comparison showed positive effects between cognitive conditions in both endurance tests (prone bridging test: mean difference, 15.7s; 95% confidence interval [CI], 7.5-24s; P=.001; Biering-Sorensen test: mean difference, 7.9s; 95% CI, 1.9-14s; P=.014). The linear regression analysis between the Tampa Scale for Kinesiophobia and the difference of time to failure between cognitive conditions showed a positive correlation only during the Biering-Sorensen test (r=0.80; P=.001).

      Conclusions

      A self-regulated dual task increases trunk muscle endurance in patients after lumbar diskectomy. The results suggest that the difference observed in time to failure between the single task and dual task is associated with fear avoidance, especially during back extension. This strategy seems especially relevant for patients with high levels of fear avoidance and may be used to improve trunk muscle endurance.

      Keywords

      List of abbreviations:

      ANOVA (analysis of variance), BMI (body mass index), CI (confidence interval), LBP (low back pain), MCID (minimal clinically important differences), ODI (Oswestry Disability Index), TSK-11SV (Tampa Scale for Kinesiophobia)
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