{"title":"有无骨质疏松的绝经后妇女的体位控制研究:静站立时压力变异性中心与负重不对称指数的关系","authors":"Sanaz Mohebi , Giti Torkaman , Fariba Bahrami","doi":"10.1016/j.gaitpost.2025.07.307","DOIUrl":null,"url":null,"abstract":"<div><h3>Introduction</h3><div>Postural instability is a key predictor of falls. This study explored center of pressure (CoP) variability using linear and nonlinear parameters. It examined how Weight-Bearing Asymmetry (WBA) relates to postural stability, offering insights into fall mechanisms in postmenopausal osteoporotic women.</div></div><div><h3>Methods</h3><div>Thirty-four postmenopausal women, aged 57.10 ± 4.49, BMI 29.11 ± 4.76 Kg/m<sup>2</sup>, non-exercising, participated in the study and were divided into two groups based on their lumbar T-score: the osteoporotic (n = 17, T-score ≤ −2.5) and the non-osteoporotic (n = 17, T-score > −1). The fall efficacy scale International (FES_I) was administered through an interview. Isometric strength of the lower extremity muscles was measured through digital hand-held dynamometer, and CoP trajectories were recorded to extract linear and non-linear parameters. Simultaneously, the subjects' base of support (BoS) was tracked using a motion capture system.</div></div><div><h3>Results</h3><div>No significant differences were found in age and BMI between groups. The osteoporotic group demonstrated significantly higher FES_I scores, reduced hip abductor strength, increased standard deviation (SD) of CoP sway velocity and displacement, and decreased CoP entropy in the frontal plane compared to the non-osteoporotic group. Additionally, osteoporotic women exhibited a pronounced WBA, favoring the non-dominant side, whereas non-osteoporotic women showed a less marked degree of WBA.</div></div><div><h3>Significance</h3><div>It is concluded that the reduced CoP entropy and increased WBA in the frontal plane may represent central nervous system strategies aimed at minimizing unpredictability in postural control during quiet standing. These adjustments may also provide the necessary stability for dynamic tasks in osteoporotic women, warranting further investigation.</div></div>","PeriodicalId":12496,"journal":{"name":"Gait & posture","volume":"122 ","pages":"Pages 78-84"},"PeriodicalIF":2.2000,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Postural control investigation in postmenopausal women with and without osteoporosis: The relationship between the center of pressure variability and weight bearing asymmetry index in quiet standing\",\"authors\":\"Sanaz Mohebi , Giti Torkaman , Fariba Bahrami\",\"doi\":\"10.1016/j.gaitpost.2025.07.307\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Introduction</h3><div>Postural instability is a key predictor of falls. This study explored center of pressure (CoP) variability using linear and nonlinear parameters. It examined how Weight-Bearing Asymmetry (WBA) relates to postural stability, offering insights into fall mechanisms in postmenopausal osteoporotic women.</div></div><div><h3>Methods</h3><div>Thirty-four postmenopausal women, aged 57.10 ± 4.49, BMI 29.11 ± 4.76 Kg/m<sup>2</sup>, non-exercising, participated in the study and were divided into two groups based on their lumbar T-score: the osteoporotic (n = 17, T-score ≤ −2.5) and the non-osteoporotic (n = 17, T-score > −1). The fall efficacy scale International (FES_I) was administered through an interview. Isometric strength of the lower extremity muscles was measured through digital hand-held dynamometer, and CoP trajectories were recorded to extract linear and non-linear parameters. Simultaneously, the subjects' base of support (BoS) was tracked using a motion capture system.</div></div><div><h3>Results</h3><div>No significant differences were found in age and BMI between groups. The osteoporotic group demonstrated significantly higher FES_I scores, reduced hip abductor strength, increased standard deviation (SD) of CoP sway velocity and displacement, and decreased CoP entropy in the frontal plane compared to the non-osteoporotic group. Additionally, osteoporotic women exhibited a pronounced WBA, favoring the non-dominant side, whereas non-osteoporotic women showed a less marked degree of WBA.</div></div><div><h3>Significance</h3><div>It is concluded that the reduced CoP entropy and increased WBA in the frontal plane may represent central nervous system strategies aimed at minimizing unpredictability in postural control during quiet standing. These adjustments may also provide the necessary stability for dynamic tasks in osteoporotic women, warranting further investigation.</div></div>\",\"PeriodicalId\":12496,\"journal\":{\"name\":\"Gait & posture\",\"volume\":\"122 \",\"pages\":\"Pages 78-84\"},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2025-07-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Gait & posture\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0966636225005636\",\"RegionNum\":3,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"NEUROSCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Gait & posture","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0966636225005636","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"NEUROSCIENCES","Score":null,"Total":0}
Postural control investigation in postmenopausal women with and without osteoporosis: The relationship between the center of pressure variability and weight bearing asymmetry index in quiet standing
Introduction
Postural instability is a key predictor of falls. This study explored center of pressure (CoP) variability using linear and nonlinear parameters. It examined how Weight-Bearing Asymmetry (WBA) relates to postural stability, offering insights into fall mechanisms in postmenopausal osteoporotic women.
Methods
Thirty-four postmenopausal women, aged 57.10 ± 4.49, BMI 29.11 ± 4.76 Kg/m2, non-exercising, participated in the study and were divided into two groups based on their lumbar T-score: the osteoporotic (n = 17, T-score ≤ −2.5) and the non-osteoporotic (n = 17, T-score > −1). The fall efficacy scale International (FES_I) was administered through an interview. Isometric strength of the lower extremity muscles was measured through digital hand-held dynamometer, and CoP trajectories were recorded to extract linear and non-linear parameters. Simultaneously, the subjects' base of support (BoS) was tracked using a motion capture system.
Results
No significant differences were found in age and BMI between groups. The osteoporotic group demonstrated significantly higher FES_I scores, reduced hip abductor strength, increased standard deviation (SD) of CoP sway velocity and displacement, and decreased CoP entropy in the frontal plane compared to the non-osteoporotic group. Additionally, osteoporotic women exhibited a pronounced WBA, favoring the non-dominant side, whereas non-osteoporotic women showed a less marked degree of WBA.
Significance
It is concluded that the reduced CoP entropy and increased WBA in the frontal plane may represent central nervous system strategies aimed at minimizing unpredictability in postural control during quiet standing. These adjustments may also provide the necessary stability for dynamic tasks in osteoporotic women, warranting further investigation.
期刊介绍:
Gait & Posture is a vehicle for the publication of up-to-date basic and clinical research on all aspects of locomotion and balance.
The topics covered include: Techniques for the measurement of gait and posture, and the standardization of results presentation; Studies of normal and pathological gait; Treatment of gait and postural abnormalities; Biomechanical and theoretical approaches to gait and posture; Mathematical models of joint and muscle mechanics; Neurological and musculoskeletal function in gait and posture; The evolution of upright posture and bipedal locomotion; Adaptations of carrying loads, walking on uneven surfaces, climbing stairs etc; spinal biomechanics only if they are directly related to gait and/or posture and are of general interest to our readers; The effect of aging and development on gait and posture; Psychological and cultural aspects of gait; Patient education.