{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T23:09:41Z","timestamp":1792192181184,"version":"4.4.0"},"reference-count":49,"publisher":"Human Kinetics","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,12,1]]},"abstract":"<jats:p>Sample entropy (SampEn) is a widely used measure for estimating the regularity of center-of-pressure (COP) trajectories, with high COP regularity (low SampEn) commonly interpreted as ineffective postural control. The current study aimed to investigate one possible source of COP regularity\u2014agonist\u2013antagonist coactivation\u2014resulting in joint stiffness or action stability. A cross-correlation analysis was conducted to determine the similarity (coactivation) level of 5 pairs of lower limb agonist\u2013antagonist electromyographic signals. SampEn was applied to anteroposterior (ap) and mediolateral (ml) COP displacements. Electromyographic and COP signals were simultaneously derived from 25 active young adults (25.6\u2009\u00b1\u20094.0\u00a0years) during unipedal balancing on stable and multiaxial-unstable surfaces. Then, the correlation between individual agonist\u2013antagonist cross-correlation coefficients and SampEn-COP was explored. The results show that only the tibialis anterior\u2013peroneus longus (TA\u2013PL) coactivations are negatively correlated with SampEn-COP<jats:sub>ap\/ml<\/jats:sub> (<jats:italic>P<\/jats:italic>\u2009\u2264\u2009.030) in both surface conditions, with greater TA\u2013PL coactivation appearing with lower SampEn-COP<jats:sub>ap\/ml<\/jats:sub>. In addition, sex effects as one factor that might influence postural control were also tested. Women exhibited greater TA\u2013PL coactivation (<jats:italic>P<\/jats:italic>\u2009=\u2009.017) and lower SampEn-COP<jats:sub>ap<\/jats:sub> (<jats:italic>P<\/jats:italic>\u2009=\u2009.005) than men. Together, TA\u2013PL coactivation could be one possible origin of COP regularity, but its effects might be detrimental to unipedal postural control, especially for women.<\/jats:p>","DOI":"10.1123\/jab.2022-0129","type":"journal-article","created":{"date-parts":[[2024,11,4]],"date-time":"2024-11-04T20:04:32Z","timestamp":1730750672000},"page":"518-527","source":"Crossref","is-referenced-by-count":2,"title":["A Potential Mechanism Involved in the Regularity of Center-of-Pressure Displacements During Achieving Unipedal Equilibrium on Stable and Unstable Surfaces"],"prefix":"10.1123","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0389-6645","authenticated-orcid":true,"given":"Arunee","family":"Promsri","sequence":"first","affiliation":[{"name":"Department of Physical Therapy, School of Allied Health Sciences, University of Phayao, Phayao, Thailand"},{"name":"Department of Sport Science, University of Innsbruck, Innsbruck, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"issue":"7","key":"r1","series-title":"Clin Biomech","doi-asserted-by":"publisher","first-page":"688","DOI":"10.1016\/j.clinbiomech.2004.04.002","article-title":"One-leg stance in healthy young and elderly adults: a measure of postural steadiness?","volume":"19","author":"Jonsson E","year":"2004","unstructured":"Jonsson E, Seiger \u00c5, Hirschfeld H. 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