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Saud F. Alsubaie, Susan L. Whitney, Joseph M. Furman, Gregory F. Marchetti, Kathleen H. Sienko, and Patrick J. Sparto

force platforms. Therefore, the purpose of this study was to examine the test–retest reliability of subjects’ postural sway during 24 standing balance tasks, within and between 2 visits occurring 1 week apart. Secondary to this main purpose, we wanted to examine which kinematic variables of postural

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Daniel G. Miner, Brent A. Harper, and Stephen M. Glass

validity of the postural sway assessment on the Biodex BioSway™ (HS-SIB) compared with the NeuroCom (HS-SOT). Methods Forty-nine subjects participated in this study (29 females: 24.34 [2.45] y, height 163.65 [7.57] cm, mass 63.64 [7.94] kg; 20 males: 26.00 [3.70] y, height 180.11 [7.16] cm, mass 82.97 [12

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Cameron T. Gibbons, Polemnia G. Amazeen, and Aaron D. Likens

placement and postural sway, which is commonly operationalized as distance traveled ( Day, Steiger, Thompson, & Marsden, 1993 ; Kim et al., 2014 ; Kirby et al., 1987 ; Mitra & Fraizer, 2004 ). Common approaches are to change the area of BoS by having participants simply vary the distance between feet or

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Leah S. Goudy, Brandon Rhett Rigby, Lisa Silliman-French, and Kevin A. Becker

functional outcomes in older adults with PD. The purpose of this investigation was to determine the changes in balance, postural sway, and QoL following 6 weeks of SHBR in older adults diagnosed with PD. It was hypothesized that (a) balance and postural sway would improve and (b) specific dimensions of the

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Andressa Busch Rocha Pereira and Renato Moraes

their importance, can disturb control of upright stance, thus causing an increase in postural sway ( Bisson, Lajoie, & Bilodeau, 2014 ; Gimmon, Riemer, Oddsson, & Melzer, 2011 ; Vuillerme, Burdet, Isableu, & Demetz, 2006 ). Although older adults typically exhibit more postural sway than young adults

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Michael A. Riley, Suvobrata Mitra, Thomas A. Stoffregen, and Michael T. Turvey

We examined the potentially exploratory and performatory nature of postural sway. Subjects stood upright or leaned forward, with eyes open or closed. Postural data were analyzed using a statistical mechanics analysis of center of pressure (COP) trajectories, which examines the fractional Brownian nature of postural sway. Positive correlations (persistence) over short time scales are hypothesized to reflect exploratory behavior, and negative correlations (antipersistence) over long time scales are hypothesized to reflect performatory behavior. When leaning, subjects exhibited decreased levels of persistence (decreased correlation) and increased levels of antipersistence (increased correlation) than when upright. With eyes open, subjects showed decreased levels of persistence and decreased levels of antipersistence than with eyes closed. Effects of vision were more pronounced when leaning. Evidence for direction-specific exploration (based upon root mean square variability analysis) was considered. Task-specificity and trade-offs between biomechanical and task constraints in models of postural control were discussed.

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Andrew G. Baker, William G. Webright, and David H. Perrin

The purpose of this study was to examine the effects of a resistive tubing kick training protocol on postural sway in uninjured collegiate wrestlers. An experimental group (n = 10) performed a progressive resistive tubing kick training protocol three times per week for 6 weeks. A control group (n = 9) performed no resistive tubing training during the 6 weeks. Postural sway (stability index) was assessed before and after the 6-week training period. ANOVAs demonstrated no significant interactions, although significant main effects were found for group and eye condition. The experimental group demonstrated less postural sway than the control group regardless of training, and postural sway was greater with the eyes closed than with the eyes open. Resistive tubing kick training does not significantly improve postural sway in healthy collegiate wrestlers. Further research should examine the potential benefits of proprioceptive training using a greater intensity of training and/or using subjects who have a greater potential for improvement.

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Philip W. Fink, Sarah P. Shultz, Eva D’Hondt, Matthieu Lenoir, and Andrew P. Hills

of stability suggest that obesity imposes significant constraints on children’s balance. Obese children have a greater area of postural sway ( Colne, Frelut, Peres, & Thoumie, 2008 ; Deforche et al., 2009 ), specifically in the mediolateral direction ( McGraw, McClenaghan, Williams, Dickerson

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Akinori Nagano, Shinsuke Yoshioka, Dean Charles Hay, and Senshi Fukashiro

The purpose of this study was to test whether a light finger touch on one’s own body (upper legs) reduces postural sway. Ten healthy males participated. In the first part of the study, the participants stood upright with their eyes closed on a force platform while ground reaction force data were collected. Two conditions differing in the placement of the arms and fingers were tested. In the no-touch condition, the participants kept their hands in loose fists. In the finger-touch condition, the participants lightly touched the lateral sides of the upper legs with all fingers. Postural sway measures were calculated from the ground reaction force data. In the second part of the study, the participants stood upright on a pneumatic balance disk while ground reaction force data were collected. Experimental and measurement protocols were identical to those used in the first part of the study. The results showed that light finger touch on the upper legs significantly reduced postural sway on the balance disk up to ~7%. The data from this study suggest that decreased postural sway due to finger contact may improve balance control during other standing tasks.

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Jay N. Hertel, Kevin M. Guskiewicz, David M. Kahler, and David H. Perrin

The purpose of this study was to investigate the effects of induced anesthesia of the lateral ankle joint on proprioception as assessed in weight-bearing and non-weight-bearing conditions. Sixteen subjects were assessed under normal conditions and following an 8-cc injection of lidocaine into the anterior talofibular ligament of the ankle being tested. Center of balance and postural sway measurements were analyzed, revealing a significant lateral adjustment of center of balance during the stable tests compared to a medial adjustment during the dynamic tests under the anesthetized condition. ANOVA of postural sway scores revealed no main effect for condition (anesthesia vs. no anesthesia), but sway scores were higher during the two dynamic conditions as compared to the stable condition. ANOVA of joint position error scores revealed no main effect for condition. Findings suggest that inhibition of the joint receptor afferent fibers adversely affected joint proprioception as assessed while subjects were weight bearing but not while they were non-weight bearing.