Gait & posture最新文献

Impact of multiple levels of visual occlusion on static postural control 多层视觉遮挡对静态体位控制的影响。

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2026-01-11 DOI: 10.1016/j.gaitpost.2026.110098

Serkan Uzlasir , Joshua S. Mohess , Erik A. Wikstrom

Background

Stroboscopic vision (SV) is a novel modality that modulates visual input and can impair postural control due to the resulting visual occlusion. SV tools have multiple levels of visual occlusion (i.e. difficulty) but our understanding of how both instrumented and clinical measures of postural control are impacted by different levels of visual occlusion remain extremely limited. A systematic evaluation across multiple levels within the same cohort is necessary to understand the dose response that could be deployed in applied scenarios.

Objective

This study aimed to investigate the effects of different levels of SV on instrumented and clinical measures of static postural control.

Methods

Thirty healthy individuals performed a single limb static balance task under six visual conditions: eyes open (EO), SV 2, SV 4, SV 6, and SV 8, and eyes closed (EC). Postural control was assessed via the 95 % confidence ellipse, center of pressure velocity, and a count of movement errors.

Results

All levels of SV resulted in significantly worse objective static postural control relative to the EO condition (p < 0.001). SV levels resulted in 95 % confidence ellipse but not center of pressure velocity values that were comparable to EC balance. No differences were noted among levels of SV (p > 0.05) for instrumented postural control. Only SV 6 resulted in worse clinically measured balance relative to EO (p < 0.05).

Conclusion

All levels of visual occlusion impair postural control but impairment magnitude is dependent on the outcome measure. Instrumented outcomes are more sensitive to SV effects than clinical outcomes.

背景：频闪视觉（SV）是一种新颖的视觉模式，它调节视觉输入，并可能由于产生的视觉遮挡而损害姿势控制。SV工具有多个水平的视觉阻塞（即难度），但我们对不同水平的视觉阻塞如何影响姿势控制的仪器和临床测量的理解仍然非常有限。有必要对同一队列中的多个水平进行系统评估，以了解在应用情景中可能部署的剂量反应。目的：探讨不同水平的SV对静态体位控制的仪器测量和临床测量的影响。方法：30名健康受试者在睁眼（EO）、睁眼2、睁眼4、睁眼6、睁眼8和闭眼（EC） 6种视觉条件下进行单肢静态平衡任务。姿势控制通过95% %置信度椭圆、压力速度中心和运动误差计数来评估。结果：所有水平的SV均导致客观静态体位控制较EO状态差（p  0.05）。只有sv6导致临床测量的平衡相对于EO更差（p ）结论：所有水平的视觉阻塞损害姿势控制，但损害程度取决于结果测量。仪器结果对SV效应比临床结果更敏感。

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引用次数: 0

Impact of age and ballet experience on overground gait kinematics and kinetics 年龄和芭蕾舞经验对地上步态运动学和动力学的影响

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2026-01-10 DOI: 10.1016/j.gaitpost.2026.110097

Caroline Simpkins , Madeleine E. Hackney , Feng Yang

Background

Ballet strengthens leg muscles, improves balance, and lowers fall risk, but its effects on gait remain under-researched. This study analyzed spatiotemporal gait parameters, dynamic gait stability, and kinetic measurements during overground walking in young professional ballet dancers, older recreational ballet dancers, and non-dancers.

Methods

Sixty participants (10 young dancers, 10 young non-dancers, 20 older dancers, 20 older non-dancers) walked at their preferred pace while their full-body kinematics and kinetics were collected. Gait speed was the primary outcome. Secondary outcomes included gait parameters (step length and width, cadence) and dynamic gait stability. Kinetic variables (peak vertical ground reaction force, rate of loading, peak propulsive force, propulsive impulse) were tertiary outcomes. All outcomes were compared across groups.

Results

Dancers, regardless of age, walked faster (p = 0.012) with longer steps (p < 0.001) than non-dancers. Younger participants demonstrated narrower step widths (p < 0.001) and a lower cadence (p = 0.022) than their older counterparts. Stability at touchdown (p ≥ 0.067) and liftoff (p ≥ 0.243) was similar across groups. Dancers exhibited a larger rate of loading (p = 0.031) and generated greater peak propulsive force (p = 0.026) than non-dancers.

Conclusions

Dancers of all ages walked faster and took longer steps than non-dancers. These kinematic differences between dancers and non-dancers may be associated with dancers’ higher loading rates and greater propulsive forces. The kinetic differences are likely attributed to the stronger lower-limb mechanics developed through ballet. Despite the kinematic/kinetic differences, all groups showed comparable gait stability. These results offer valuable insights into the mechanisms underlying dynamic stability control in ballet dancers across ages.

芭蕾舞可以增强腿部肌肉，改善平衡，降低跌倒风险，但对步态的影响仍未得到充分研究。本研究分析了年轻专业芭蕾舞者、老年休闲芭蕾舞者和非舞蹈者在地上行走时的时空步态参数、动态步态稳定性和动力学测量。方法60名参与者（10名年轻舞蹈者，10名年轻非舞蹈者，20名老年舞蹈者，20名老年非舞蹈者）以自己喜欢的速度行走，同时收集他们的全身运动学和动力学数据。步态速度是主要观察指标。次要结果包括步态参数（步长、步宽、步速）和动态步态稳定性。动力学变量（峰值垂直地面反作用力、加载速率、峰值推进力、推进冲量）是第三指标。各组间比较所有结果。结果无论年龄大小，跳舞的人比不跳舞的人走得更快（p = 0.012），步长（p <； 0.001）。年轻的参与者比年长的参与者表现出更窄的步宽（p <； 0.001）和更低的节奏（p = 0.022）。各组在着陆（p ≥ 0.067）和升空（p ≥ 0.243）时的稳定性相似。跳舞者比不跳舞者表现出更大的负荷率（p = 0.031）和产生更大的峰值推进力（p = 0.026）。结论：所有年龄段的舞者都比不跳舞的人走得更快，步数更长。跳舞者和不跳舞者之间的这些运动学差异可能与跳舞者更高的负荷率和更大的推进力有关。运动上的差异很可能是由于通过芭蕾发展出的更强的下肢力学。尽管运动学/动力学存在差异，但所有组均表现出相当的步态稳定性。这些结果为跨年龄芭蕾舞者动态稳定性控制的机制提供了有价值的见解。

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引用次数: 0

Identification potential of cognitive-motor dual-task gait in frailty via machine learning model 基于机器学习模型的衰弱认知-运动双任务步态识别潜力

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2026-01-08 DOI: 10.1016/j.gaitpost.2026.110096

Jiani Wu , Yurou He , Xiaoqin Wang , Haodong Huang , Zhangjing Deng , Yingxi Chen , Jiaqi Song , Zehu Sheng , Qi Tian , Yang Lü

Background

The early diagnosis and intervention of frailty play a crucial role in enhancing the quality of life for elderly individuals in their later years. Currently, the identification of frailty relies on various manual assessment scales, which are time-consuming and pose significant challenges to clinical practice.

Methods

A total of 220 participants were recruited to collect Timed Up-and-Go Test (TUGT) data, as well as single-task (ST) and cognitive-motor dual-task gait parameters. The modified Frailty Index-11 (mFI-11) scale and cognitive function assessments were completed. Machine learning (ML) methods were employed to screen gait parameters and construct a frailty diagnostic model. The receiver operating characteristic (ROC) curve was utilized to evaluate the correlation between significant gait indicators identified in the optimal model and cognitive frailty.

Results

Among the 220 participants, the numbers of individuals classified as non-frailty, pre-frailty, and frailty were 83, 88, and 49, respectively. Within these groups, 43 were cognitively normal, and 53 exhibited cognitive frailty. In the model utilizing gait features, the SVM - Linear Kernel model exhibited the best classification performance, with an accuracy of 64.09 % and an F1 score of 64.38 %. Among the gait parameters, TUGT contributed significantly to the model while also demonstrating high predictive value for cognitive frailty (AUC = 0.8293, P < 0.0001).

Conclusions

The integration of cognitive-motor dual-task gait parameters with ML methods demonstrates satisfactory overall accuracy for the tri-classification diagnosis of frailty, indicating potential for community screening and auxiliary clinical diagnosis. Cognitive frailty shows significant correlations with gait parameters, particularly those assessed by TUGT.

背景虚弱的早期诊断和干预对提高老年人晚年生活质量起着至关重要的作用。目前，虚弱的识别依赖于各种人工评估量表，这既耗时又对临床实践构成重大挑战。方法共招募220名受试者，收集时间起身测试（TUGT）数据、单任务（ST）和认知-运动双任务步态参数。完成修改后的衰弱指数-11 （mFI-11）量表和认知功能评估。采用机器学习（ML）方法筛选步态参数，构建虚弱诊断模型。利用受试者工作特征（ROC）曲线评估最优模型中识别的重要步态指标与认知衰弱之间的相关性。结果220名参与者中，非体弱、预体弱和体弱的人数分别为83人、88人和49人。在这些组中，43人认知正常，53人表现出认知脆弱。在利用步态特征的模型中，SVM - Linear Kernel模型的分类性能最好，准确率为64.09 %，F1得分为64.38 %。在步态参数中，TUGT对模型的贡献显著，同时对认知衰弱也有很高的预测价值（AUC = 0.8293, P <； 0.0001）。结论将认知-运动双任务步态参数与ML方法相结合，对虚弱三分类诊断具有满意的总体准确性，具有社区筛查和辅助临床诊断的潜力。认知衰弱显示出与步态参数的显著相关性，特别是那些由TUGT评估的。

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引用次数: 0

Running with chronic ankle instability: Task-dependent stride-to-stride ankle kinematic variability in sagittal and frontal planes 慢性踝关节不稳定的跑步：任务依赖的跨步踝关节矢状面和额平面的运动学变异性

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2026-01-08 DOI: 10.1016/j.gaitpost.2025.110092

Yuki A. Sugimoto , Scott E. Ross

Background

Chronic ankle instability (CAI) is characterized by repeated episodes of ankle "giving way" and long-term sensorimotor deficits. Although previous studies have reported altered movement variability in individuals with CAI, it remains unclear how this variability differs across limbs, planes of motion, and tasks with varying mechanical demands. This study investigated the influence of task demands on stride-to-stride ankle kinematic variability in the sagittal and frontal planes in individuals with unilateral CAI compared to healthy controls.

Methods

Fifty physically active participants with (n = 24) and without (n = 26) CAI completed treadmill walking and running at self-selected speeds. Ankle kinematics were recorded bilaterally, and sample entropy (SampEn) was calculated from the first 200 consecutive strides per limb for each task. A four-way mixed ANOVA was conducted to examine the effects of group (CAI, control), limb (injured, uninjured), plane (sagittal, frontal), and task (walking, running) on ankle kinematic variability.

Results

A significant interaction was found between group, limb, plane, and task (F_(1,48) = 21.644, P < .001). During running, individuals with CAI exhibited reduced SampEn in the sagittal and frontal planes across the injured and uninjured limbs compared to healthy controls, indicating more predictable and constrained motor control. No group differences were observed during walking, suggesting similar motor control under lower task demands.

Significance

CAI-related motor control alterations are more evident during higher-demand tasks such as running. The bilateral reduction in variability may reflect centrally mediated neuromuscular adaptations. Future research should explore the role of limb dominance, muscle activation, and real-world task variability to better understand motor control disruptions in individuals with and without CAI.

背景：慢性踝关节不稳定（CAI）的特点是反复发作的踝关节“让位”和长期的感觉运动缺陷。尽管先前的研究报道了CAI患者的运动变异性的改变，但尚不清楚这种变异性在四肢、运动平面和不同机械要求的任务中是如何不同的。本研究调查了任务要求对单侧CAI患者矢状面和额状面跨步踝关节运动学变异性的影响，并与健康对照进行了比较。方法50名体力活动的受试者（n = 24）和（n = 26）分别以自行选择的速度在跑步机上行走和跑步。记录双侧踝关节的运动学，并从每个任务中每个肢体连续的前200步中计算样本熵（SampEn）。采用四向混合方差分析来检验组（CAI、对照）、肢体（受伤、未受伤）、平面（矢状面、额状面）和任务（步行、跑步）对踝关节运动变异性的影响。结果组、肢、面、任务之间存在显著交互作用(F(1,48) = 21.644，P（ <； .001）。在跑步过程中，与健康对照组相比，CAI患者在受伤和未受伤肢体的矢状面和额叶面表现出减少的SampEn，这表明运动控制更具可预测性和约束性。在步行过程中没有观察到组间差异，这表明在较低的任务要求下运动控制相似。在跑步等高要求任务中，与ai相关的运动控制改变更为明显。双侧变异性的减少可能反映了中枢介导的神经肌肉适应。未来的研究应该探索肢体优势、肌肉激活和现实世界的任务变异性的作用，以更好地理解有和没有CAI的个体的运动控制中断。

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引用次数: 0

Assessment of forward head posture in individuals with and without chronic neck pain: A cross-sectional study 有或无慢性颈部疼痛的个体前倾头部姿势的评估：一项横断面研究

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2026-01-07 DOI: 10.1016/j.gaitpost.2026.110093

Isabel Tunas-Maceiras , Fernando Ramos-Gómez , Beatriz Rodríguez-Romero

Background

Chronic neck pain (CNP) is a leading cause of disability worldwide. Forward head posture (FHP) is a prevalent craniocervical posture, with controversy regarding its relationship with CNP. The craniovertebral angle (CVA) is commonly used to assess FHP.

Objectives

To determine whether significant differences in head posture, assessed through the CVA, exist between adults with and without CNP. Secondary objectives include conducting an exploratory analysis of variables, evaluating intra- and interobserver reliability of CVA by novice evaluators and analyzing CVA correlations between sitting and standing.

Design

Two-group cross-sectional study.

Methods

92 participants were evaluated (50 with CNP, 42 asymptomatic). CVA was measured in sitting and standing using photogrammetry. Sociodemographic data, musculoskeletal pain prevalence, pain intensity, general health, physical activity, and neck disability were collected. CVA intra- and interobserver reliability was assessed using Kinovea. Factors associated with CVA were identified using multiple linear regression analysis.

Results

No association was found between FHP and CNP. Gender and BMI were associated with CVA. Women had significantly lower CVA than men seated (B= −2.5, p = 0.024) and standing (B= −2.0, p = 0.031). Overweight individuals had significantly lower CVA than normal-weight individuals seated and standing (B= −0.6, p < 0.001 for both). Inter- and intra-reliability in both positions was excellent (all ICC > 0.90). A correlation was observed between sitting and standing measurements.

Conclusion

No significant association was found between CNP and FHP based on CVA. Sex, age and BMI demonstrated a substantial influence on head posture. CVA photogrammetry is reliable for novice evaluators.

背景：慢性颈部疼痛（CNP）是世界范围内致残的主要原因。头部前倾姿势（FHP）是一种常见的颅颈姿势，关于其与CNP的关系存在争议。颅椎角（CVA）通常用于评估FHP。目的通过CVA评估，确定有和没有CNP的成年人在头部姿势上是否存在显著差异。次要目标包括进行变量的探索性分析，评估新手评估者CVA的内部和观察者之间的可靠性，以及分析坐姿和站立之间的CVA相关性。设计两组横断面研究。方法对92例受试者进行评估（伴有CNP者50例，无症状者42例）。采用摄影测量法分别在坐姿和站立状态下测量CVA。收集社会人口统计数据、肌肉骨骼疼痛患病率、疼痛强度、一般健康状况、身体活动和颈部残疾。使用Kinovea评估CVA在观察者内部和观察者之间的信度。使用多元线性回归分析确定与CVA相关的因素。结果FHP与CNP无相关性。性别和BMI与CVA相关。女性的CVA明显低于男性坐着（B= - 2.5, p = 0.024）和站立（B= - 2.0, p = 0.031）。超重个体的CVA显著低于坐着和站立的正常体重个体（B= - 0.6, p <； 0.001）。两个位置之间和内部的可靠性都很好（所有ICC >； 0.90）。坐着和站着的测量结果之间存在相关性。结论CNP与基于CVA的FHP无显著相关性。性别、年龄和身体质量指数对头部姿势有重大影响。CVA摄影测量对新手评价者是可靠的。

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引用次数: 0

Links between central visual field loss and movement processing during walking 行走时中央视野丧失与运动处理之间的联系

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2026-01-07 DOI: 10.1016/j.gaitpost.2026.110095

Natela M. Shanidze , Catherine P. Agathos , Toby J. Ellmers , William R. Young

Background

Central visual field loss (CFL) is the most common irreversible visual impairment in aging and is associated with higher fall risk and concerns about falling. This study explored the links between CFL severity, functional balance, and walking-related attentional processing implicated in reduced gait performance.

Methods

In Study 1, 29 individuals with CFL and 29 age-matched controls completed the Timed Up and Go (TUG) test. In Study 2, 10 CFL participants and 10 controls performed the TUG while acceleration data were collected from head and trunk IMUs. For both studies, we assessed visual impairment severity (contrast sensitivity) and participants’ attentional processing during walking (Gait-Specific Attentional Profile, G-SAP).

Results

Both groups showed positive correlations between TUG duration and G-SAP subscales. G-SAP scores were lower in CFL participants with worse contrast sensitivity indicating reduced cognitive processing during walking. Worse contrast sensitivity was also associated with greater head and trunk acceleration and acceleration variability during walking, suggesting reduced gait stability. Higher rumination and conscious movement processing scores also correlated with improved segmental control in CFL.

Significance

Increased cognitive processing of gait is associated with impaired functional balance. This association appears to be reversed in CFL, with severe visual deficit diverting cognitive resources from movement control. This altered strategy may prioritise the acquisition and processing of visuospatial information in CFL. The observed postural instability with increasing CFL severity and a lack of excessive cognitive involvement in movement control suggest heightened gait-specific attention could be leveraged for balance and gait training in CFL.

中央视野丧失（CFL）是老年人最常见的不可逆视力损害，与较高的跌倒风险和对跌倒的担忧有关。本研究探讨了CFL严重程度、功能平衡和与步行相关的注意力处理与步态表现下降之间的联系。方法在研究1中，29名CFL患者和29名年龄匹配的对照组完成了TUG （Timed Up and Go）测试。在研究2中，10名CFL参与者和10名对照组进行了TUG，同时收集了头部和躯干imu的加速度数据。在这两项研究中，我们评估了视觉损伤的严重程度（对比敏感度）和参与者在步行时的注意力处理（gai - specific attention Profile, G-SAP）。结果两组患者TUG持续时间与G-SAP量表呈显著正相关。对比敏感度较差的CFL参与者的G-SAP评分较低，表明行走时认知加工减少。较差的对比敏感度还与行走时头部和躯干加速度和加速度变异性较大有关，这表明步态稳定性降低。较高的反刍和意识运动加工得分也与CFL中片段控制的改善相关。步态认知加工增加与功能平衡受损有关。这种关联在CFL中似乎是相反的，严重的视觉缺陷转移了运动控制的认知资源。这种改变的策略可能会优先考虑CFL中视觉空间信息的获取和处理。随着CFL严重程度的增加，观察到的姿势不稳定和运动控制中缺乏过度的认知参与表明，在CFL的平衡和步态训练中，可以利用增强的步态特异性注意力。

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引用次数: 0

Multi-modal gait assessment in Parkinson's Disease: A pilot study examining the impact of terrain and environment 帕金森病的多模式步态评估：一项检查地形和环境影响的试点研究

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2026-01-06 DOI: 10.1016/j.gaitpost.2026.110094

Y. Celik , L.T. Pearson-Noseworthy , J. Das , S. Stuart , W.L. Woo , A. Godfrey

Background

Impaired gait is common in people with Parkinson’s disease (PwPD), increasing fall risk which is amplified when on complex/uneven terrains. Most studies focus on inertial-based spatiotemporal characteristics alone stratified to domains (e.g., pace) within indoor settings. Less is known about environmental challenges impacting joint kinematics and muscle activation, critical to understanding adaptive gait and informing personalised interventions. This pilot adopts a multimodal approach to examine the effects of different terrains and environments on gait in PwPD.

Methods

Ten PwPD completed indoor and outdoor walks across soft and hard terrains, including tiled rubber, rocky cobblestones, asphalt, grass, cobble pavement, and carpet. Spatiotemporal, knee joint kinematics, and muscle activation characteristics were collected via wearables. Multimodal characteristics were extracted by a previous validated data fusion methodology. Wilcoxon signed-rank test was used to investigate the impact of terrain and environment on gait.

Results

Pace characteristics were significantly higher on hard terrain where their variability increased during outdoor walks. No significant differences were found in rhythm or asymmetry domains across terrain types or environmental contexts. Knee flexion-extension asymmetry was lower and peak flexion occurred earlier on hard surfaces. Muscle activation levels were significantly lower outdoors, while soft terrains produced higher activation in distal muscles during swing phases, although frequency measures tended to be higher on hard terrain. Terrain related differences were more limited compared to environmental differences in muscle activity.

Conclusions

Multimodal gait assessment using wearables can be conducted on PwPD in different settings. Findings demonstrate terrain and environmental demands influence spatial parameters, knee joint kinematics and muscle activity in PwPD which may be more informative for fall risk assessment and personalised interventions.

步态障碍在帕金森病患者（PwPD）中很常见，增加了跌倒的风险，当在复杂/不平坦的地形上时，这种风险会被放大。大多数研究集中在室内环境中基于惯性的时空特征分层域（例如，步伐）。对影响关节运动学和肌肉激活的环境挑战知之甚少，这对于理解适应性步态和告知个性化干预措施至关重要。该试验采用多模态方法来研究不同地形和环境对PwPD步态的影响。方法sten PwPD完成了室内和室外行走，行走的地形包括铺有瓷砖的橡胶、岩石鹅卵石、沥青、草地、鹅卵石路面和地毯。通过可穿戴设备收集时空、膝关节运动学和肌肉激活特征。采用先前验证的数据融合方法提取多模态特征。采用Wilcoxon符号秩检验研究地形和环境对步态的影响。结果在室外行走时，空间特征在坚硬地形上的变异性显著增加。在地形类型或环境背景中，节律或不对称域没有发现显着差异。膝关节屈伸不对称程度较低，在坚硬表面发生屈曲高峰的时间较早。肌肉激活水平在户外明显较低，而软地形在摇摆阶段产生远端肌肉更高的激活，尽管频率测量在硬地形上往往更高。与肌肉活动的环境差异相比，地形相关的差异更为有限。结论可穿戴设备可在不同环境下对PwPD进行多模态步态评估。研究结果表明，地形和环境需求会影响PwPD患者的空间参数、膝关节运动学和肌肉活动，这可能为跌倒风险评估和个性化干预提供更多信息。

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引用次数: 0

Dynamic changes in the moment arm of the Achilles tendon during weight bearing conditions measured by dual fluoroscopy imaging system 双透视成像系统测量负重状态下跟腱力臂的动态变化

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2025-12-26 DOI: 10.1016/j.gaitpost.2025.110091

Bálint Kovács , Chengyuan Zhu , Enze Shao , Dong Sun , Yang Song , Yaodong Gu

Background

There are various methods used to estimate the length of the Achilles tendon moment arm, but these methods often provide substantially different results. Using radiographic images can help with better localization of the bones, but it is often used during static conditions. Using a dual fluoroscopy imaging system enables us to obtain in vivo data during dynamic movement, which could provide a more detailed description of the ankle joint position-dependent length changes of the Achilles tendon moment arm angle.

Methods

Ten healthy male university students volunteered to participate in this study. Fluoroscopic images of the ankle during a task mimicking the stance phase of walking were captured under barefoot conditions. Achilles tendon moment arm length was estimated from sagittal-plane dual fluoroscopic images by identifying the line of action of the tendon and computing the center of rotation as the center of a best-fit circle applied to the talar dome. The moment arm was normalized to calcaneus length.

Results

Achilles tendon moment arm increased its length from 4.4 ± 0.3 cm at −20° dorsiflexion to 5.1 ± 0.4 cm at 0° ankle joint position and further increased its length to 5.8 ± 0.5 cm at 40° plantarflexion ankle joint position. The regression model showed a moderate polynomial association between moment arm length and ankle joint position (R²=0.55).

Conclusion

The observed parabolic relationship between Achilles tendon moment arm and angle under dynamic conditions is in line with previous reports using static and unloaded conditions. However, the high inter-individual variation in normalized moment arm length prevents establishing a general model that could estimate the joint position dependent length changes of the moment arm.

有各种各样的方法用于估计跟腱力矩臂的长度，但这些方法往往提供了本质上不同的结果。使用放射图像可以帮助更好地定位骨骼，但它通常在静态条件下使用。使用双透视成像系统，我们可以获得动态运动过程中的体内数据，可以更详细地描述踝关节位置相关的跟腱力矩臂角长度变化。方法10名健康男性大学生自愿参加本研究。在赤脚条件下，在模拟行走的姿势阶段的任务中，脚踝的透视图像被捕获。通过识别跟腱的作用线并计算旋转中心作为应用于距骨穹窿的最适合圆的中心，从矢状面双透视图像估计跟腱力矩臂长度。力臂归一化为跟骨长度。ResultsAchilles肌腱力臂增加它的长度从4.4 ±0.3  厘米−20°背屈至5.1 ±0.4  厘米在0°踝关节位置,进一步增加了长度5.8 ±0.5  厘米40°plantarflexion踝关节位置。回归模型显示，力臂长度与踝关节位置之间存在中度多项式相关（R2=0.55）。结论动态条件下跟腱力臂与角度呈抛物线关系，与以往静态和卸载条件下的报道一致。然而，归一化矩臂长度的个体间差异较大，无法建立一个通用模型来估计矩臂长度随关节位置的变化。

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引用次数: 0

Osseointegrated prostheses reduce reactive stability demands during walking in Service members with unilateral transfemoral amputation 骨整合假体减少单侧经股截肢军人行走时的反应性稳定性需求

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2025-12-24 DOI: 10.1016/j.gaitpost.2025.110090

Julian C. Acasio , Pawel R. Golyski , Benjamin K. Potter , Jonathan A. Forsberg , Brad D. Hendershot

Background

Heightened fall risk following lower limb amputation can lead to adaptations during walking that increase proactive stability (e.g., a wider base of support). However, such compensations also reduce maneuverability, increasing reactive stability demands (e.g., corrective steps) as more lateral foot placement necessitates greater lateral impulses. By improving prosthetic control, osseointegration (OI) may mitigate fall risk and reduce the need for proactive stability compensations. Thus, this work aims to characterize proactive stability compensations, via mediolateral margins of stability (MOS_ML) as well as reactive stability demands, via absolute and net integrated whole-body angular momentum (iWBAM), and variability in net iWBAM.

Methods

Eight Service members (SMs) with unilateral transfemoral amputation completed biomechanical gait evaluations before, and 12- and 24-months after OI. We hypothesized minimum MOS_ML would decrease as would absolute tri-planar integrated WBAM (iWBAM) and net iWBAM variability following OI, indicative of decreased reliance on proactive stability compensations and reduced reactive stability demands, respectively.

Results

Relative to pre-OI, minimum MOS_ML did not decrease at either post-OI evaluation, sagittal absolute iWBAM were 8.8 % and 7.0 % less at 12-months and 24-months post-OI, respectively. Additionally, sagittal net iWBAM variability decreased by 32.1 % at 24-months post-OI versus pre-OI. No other differences were observed in pre- versus post-OI measures.

Significance

These findings suggest that, unlike civilian populations, OI does not decrease passive stability compensations among SMs; however, OI may reduce reactive stability demands relative to socket-suspended prostheses among SMs. Future work should evaluate whether these differences extend to decreased fall risk in daily life.

背景：下肢截肢后跌倒风险的增加可能导致行走时的适应性，从而增加主动稳定性（例如，更宽的支撑基础）。然而，这样的补偿也降低了机动性，增加了反应稳定性要求（例如，纠正步骤），因为更多的侧向脚放置需要更大的侧向脉冲。通过改善假肢控制，骨整合（OI）可以减轻跌倒风险，减少对主动稳定性补偿的需求。因此，本研究旨在通过中外侧稳定性边缘（MOSML）和反应性稳定性需求，通过绝对和净综合全身角动量（iWBAM）以及净iWBAM的变异性来表征主动稳定性补偿。方法8例单侧经股截肢患者分别在成骨不全术前、术后12个月和24个月完成生物力学步态评估。我们假设最小MOSML和绝对三平面集成WBAM （iWBAM）以及净iWBAM变异性在OI后会降低，分别表明对主动稳定性补偿的依赖减少，反应性稳定性需求减少。结果：相对于成骨不全术前，最小MOSML在成骨不全后评估均未降低，矢状面绝对iWBAM在成骨不全后12个月和24个月分别降低8.8 %和7.0 %。此外，在成骨不全后24个月与成骨不全前相比，矢状面净iWBAM变异性降低了32.1% %。在成骨不全前后的测量中未观察到其他差异。这些发现表明，与平民人群不同，成骨不全不会降低SMs之间的被动稳定性补偿；然而，相对于套筒悬浮假体，成骨不全可能降低对反应性稳定性的要求。未来的工作应该评估这些差异是否延伸到日常生活中跌倒风险的降低。

{"title":"Osseointegrated prostheses reduce reactive stability demands during walking in Service members with unilateral transfemoral amputation","authors":"Julian C. Acasio , Pawel R. Golyski , Benjamin K. Potter , Jonathan A. Forsberg , Brad D. Hendershot","doi":"10.1016/j.gaitpost.2025.110090","DOIUrl":"10.1016/j.gaitpost.2025.110090","url":null,"abstract":"<div><h3>Background</h3><div>Heightened fall risk following lower limb amputation can lead to adaptations during walking that increase proactive stability (e.g., a wider base of support). However, such compensations also reduce maneuverability, increasing reactive stability demands (e.g., corrective steps) as more lateral foot placement necessitates greater lateral impulses. By improving prosthetic control, osseointegration (OI) may mitigate fall risk and reduce the need for proactive stability compensations. Thus, this work aims to characterize proactive stability compensations, via mediolateral margins of stability (MOS<sub>ML</sub>) as well as reactive stability demands, via absolute and net integrated whole-body angular momentum (iWBAM), and variability in net iWBAM.</div></div><div><h3>Methods</h3><div>Eight Service members (SMs) with unilateral transfemoral amputation completed biomechanical gait evaluations before, and 12- and 24-months after OI. We hypothesized minimum MOS<sub>ML</sub> would decrease as would absolute tri-planar integrated WBAM (iWBAM) and net iWBAM variability following OI, indicative of decreased reliance on proactive stability compensations and reduced reactive stability demands, respectively.</div></div><div><h3>Results</h3><div>Relative to pre-OI, minimum MOS<sub>ML</sub> did not decrease at either post-OI evaluation, sagittal absolute iWBAM were 8.8 % and 7.0 % less at 12-months and 24-months post-OI, respectively. Additionally, sagittal net iWBAM variability decreased by 32.1 % at 24-months post-OI versus pre-OI. No other differences were observed in pre- versus post-OI measures.</div></div><div><h3>Significance</h3><div>These findings suggest that, unlike civilian populations, OI does not decrease passive stability compensations among SMs; however, OI may reduce reactive stability demands relative to socket-suspended prostheses among SMs. Future work should evaluate whether these differences extend to decreased fall risk in daily life.</div></div>","PeriodicalId":12496,"journal":{"name":"Gait & posture","volume":"125 ","pages":"Article 110090"},"PeriodicalIF":2.4,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

How our homes shape the way we move 我们的家如何影响我们的出行方式

IF 2.4 3区医学 Q3 NEUROSCIENCES

Gait & posture

Pub Date : 2025-12-24 DOI: 10.1016/j.gaitpost.2025.110089

Mélodie Sannier, Stefan Janaqi, Gérard Dray, Benoît G. Bardy

Background

Human movement within the home remains poorly understood despite growing interest in smart environments and aging-in-place technologies. Investigating walking behavior within domestic spaces, which are subject to specific constraints and obstacles, may reveal significant differences from outdoor walking and provide a deeper understanding of human-environment interactions in indoor settings.

Methods

We present a four-year longitudinal study of natural indoor walking behavior, conducted using proximity-sensitive flooring in a smart apartment located in Montpellier, in southern France. Eight participants, organized into pairs, were monitored to observe their natural indoor walking behavior.

Results

The data, processed through algorithmic analysis, enabled the characterization of walking behavior indoors. By analyzing 2.5 million steps and over 346,000 individual walking trajectories, we show that indoor locomotion is fragmented, variable, and strongly constrained by the environment.

Conclusion

Though step counts were lower than in public spaces, home-based walking comprised a meaningful share of daily activity. Changes in walking patterns may serve as early indicators of functional decline, offering new avenues for health monitoring and smart home design.

尽管人们对智能环境和原地老化技术的兴趣日益浓厚，但对人类在家中的运动仍然知之甚少。研究受特定限制和障碍影响的室内行走行为，可能会揭示与室外行走的显著差异，并对室内环境中人与环境的相互作用提供更深入的理解。方法：我们对自然室内行走行为进行了为期四年的纵向研究，在法国南部蒙彼利埃的一所智能公寓中使用了邻近敏感地板。八名参与者分成两组，观察他们自然的室内行走行为。结果通过算法分析处理的数据能够表征室内行走行为。通过分析250万步和超过34.6万个人的行走轨迹，我们发现室内运动是碎片化的、可变的，并且受到环境的强烈约束。结论：虽然步数比公共场所低，但在家步行在日常活动中所占的比例很有意义。行走方式的变化可能是功能衰退的早期指标，为健康监测和智能家居设计提供了新的途径。

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引用次数: 0