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An Examination of Contributing Factors to Star Excursion Balance Test in Individuals with and without Chronic Ankle Instability

Carey, Sara E
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1364379060

Abstract Details

2013, Master of Science, University of Toledo, Exercise Science.
Objective: The purposes of this study were to determine if differences exist in sagittal plane strength at the ankle and knee, static and dynamic postural control, ankle dorsiflexion range of motion (DFROM), and ankle laxity between individuals with and without chronic ankle instability (CAI) as well as to determine which factors contribute the most to Star Excursion Balance Test (SEBT) performance in the CAI and healthy control groups. Design: A case-control study. Setting: Research laboratory. Participants: Twenty healthy control participants (M=6, F=14, 20.5±1.3 yrs, 70.63± 15.9 kg, 167.52±11.1 cm.) and eighteen CAI participants (M=10, F=8, 20.2±2.2 yrs, 75.66±14.7 kg, 171.45±9.7 cm.) volunteered for this study. Interventions: Dynamic postural control was assessed with the three directions of the SEBT. After four practice trials, participants performed four testing trials. Concentric strength of the sagittal plane movers of the ankle and the knee was assessed on an isokinetic dynamometer. Static postural control was assessed during a single-leg static balance on a force plate under eyes-closed (EC) conditions. Center of pressure (COP) displacements were recorded in the anteroposterior (AP) and mediolateral (ML) directions during 3, 15-second trials. Ankle DFROM was assessed using the weight-bearing lunge test (WBLT). Ankle joint laxity was evaluated using the instrumented ankle arthometer in the AP and Inversion-Eversion (I-E) directions. Main Outcome Measures: Dynamic postural control was represented as the average of the three reach distances (cm) normalized by leg length (cm) and represented as a percentage score (MAXD). Static balance was calculated as the center of pressure velocity (COPV, m/s2) and time-to-boundary (TTB). Ankle dorsiflexion from the WBLT is represented by the distance away from the wall (cm) the foot can slide and still allow the knee to touch the wall while performing closed-chain dorsiflexion. Ankle dorsiflexion and plantar flexion, and knee flexion and extension strength was normalized to body mass and represented as average peak torque (Nm/kg) from five trials. AP and IE ankle laxity were quantified in millimeters and degrees, respectively. Statistical Analysis: Independent t-tests were used to compare each dependent variable between the CAI and control groups. A Cohen’s d effect size along with 95% confidence intervals (CI) was calculated for each comparison between groups. A backward regression analysis was performed to determine which dependent variables influence the SEBT performance of both groups. Significance was set a priori at p<0.05. Results: Significant differences were observed in static postural control measures between the groups in the static postural control (p < 0.05). All other variables were not statistically significant (p > 0.05). The regression model showed that ankle plantar flexion and WBLT predicted SEBT performance in the CAI group whereas knee strength and static postural control predicted SEBT performance in the control group. Conclusion: Participants with CAI had decreased postural control compared to the healthy controls, indicating that the presence of CAI may be associated with altered sensorimotor control. Ankle dorsiflexion and plantar flexor strength were significant predictors of SEBT performance in the CAI group, while knee strength and static balance were the major contributors to the SEBT performance. When deficits in dynamic postural control is detected using the SEBT, our data suggests the need to address ankle DFROM and plantar flexor strength for individuals with CAI as well as knee strength and static balance for those without any lower extremity injury in order to improve their dynamic function.
Phillip Gribble (Advisor)
Kate Pfile (Committee Member)
Brian Pietrosimone (Committee Member)
Kinesiology

Recommended Citations

Citations

  • Carey, S. E. (2013). An Examination of Contributing Factors to Star Excursion Balance Test in Individuals with and without Chronic Ankle Instability [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1364379060

    APA Style (7th edition)

  • Carey, Sara. An Examination of Contributing Factors to Star Excursion Balance Test in Individuals with and without Chronic Ankle Instability . 2013. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1364379060.

    MLA Style (8th edition)

  • Carey, Sara. "An Examination of Contributing Factors to Star Excursion Balance Test in Individuals with and without Chronic Ankle Instability ." Master's thesis, University of Toledo, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1364379060

    Chicago Manual of Style (17th edition)

toledo1364379060
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This open access ETD is published by University of Toledo and OhioLINK.