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Lower Extremity Fatigue Increases Complexity of Postural Control During a Single-legged Stance by Stephen J McGregor; W Jeffrey Armstrong; James A Yaggie; Erik M Bollt; Rana Parshad; Jerry J Bailey; Sean M Johnson; Aleta M Goin; Samuel R Kelly is a Medicine article available to read on EtoBox.

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## Background Non-linear approaches to assessment of postural control can provide insight that compliment linear approaches. Control entropy (CE) is a recently developed statistical tool from non-linear dynamical systems used to assess the complexity of non-stationary signals. We have previously used CE of high resolution accelerometry in running to show decreased complexity with exhaustive exercise. The purpose of this study was to determine if complexity of postural control decreases following fatiguing exercise using CE. ## Methods Ten subjects (5 M/5 F; 25 ± 3 yr; 169.4 ± 11.7 cm; 79.0 ± 16.9 kg) consented to participation approved by Western Oregon University IRB and completed two trials separated by 2-7 days. Trials consisted of two single-legged balance tests separated by two Wingate anaerobic tests (WAnT; PreFat/PostFat), or rest period (PreRest/PostRest). Balance tests consisted of a series of five single-legged stances, separated by 30 s rest, performed while standing on the dominant leg for 15-s with the participant crossing the arms over the chest and flexing the non-dominant knee to 90 degrees. High resolution accelerometers (HRA) were fixed superficial to L3/L4 at the

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Author

Stephen J McGregor; W Jeffrey Armstrong; James A Yaggie; Erik M Bollt; Rana Parshad; Jerry J Bailey; Sean M Johnson; Aleta M Goin; Samuel R Kelly

Publisher

BioMed Central; Springer (Biomed Central Ltd.); [London]: BioMed Central, 2004-; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 1743-0003)

Published

2011

Language

EN

Field

Medicine (Health Sciences)