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A Physically Active Lifestyle Can Protect against Age-Related Decline in Ankle Proprioception

JOURNAL OF MOTOR BEHAVIOR 2024年第3期56卷 305-314页

作者： Sertic, Jacquelyn V. L. Fall, Nicole Konczak, Juergen Univ Minnesota Sch Kinesiol Human Sensorimotor Control Lab Minneapolis MN USA Univ Minnesota Ctr Clin Movement Sci Minneapolis MN USA Univ Minnesota Sch Kinesiol Human Sensorimotor Control Lab Minneapolis MN 55414 USA

This study examined whether physically active middle-aged (50-64 years) and older adults (65-80 years) demonstrate age-related ankle proprioceptive decline relative to younger counterparts. Empirical data indicate that ankle proprioception declines with aging and such sensory decline negatively affects balance. Using a passive motion apparatus, we employed a psychophysical forced-choice paradigm in which the ankle was passively plantarflexed to a reference position (15 degrees or 25 degrees) and a comparison position that was always smaller than the reference. Subsequently, participants indicated which position was more plantarflexed. As outcome measures of ankle position sense acuity, a just-noticeable-difference (JND) threshold and the uncertainty area (UA) were derived from the psychometric stimulus-response difference function for each participant. The JND threshold is a measure of proprioceptive bias and UA constitutes a measure of precision. The main results are: First, at the 15 degrees reference, most middle-aged (74%) and older adults (71%) had thresholds within the range of the young adults. The respective median JND threshold of young adults was statistically lower when compared to both older groups. Second, no differences between age groups were observed at the 25 degrees reference. Third, no age-related differences were found for UA at either reference. These data indicate that physically active aging adults may be spared from age-related decline in ankle position sense and that age-related differences emerge for small ankle displacements. The findings underscore the importance of remaining active during aging.

关键词： aging human physical activity proprioception

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Typical Development of Finger Position Sense From Late Childhood to Adolescence

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JOURNAL OF MOTOR BEHAVIOR 2023年第1期55卷 102-110页

作者： Oh, Jinseok Mahnan, Arash Xu, Jiapeng Block, Hannah J. Konczak, Jurgen Univ Minnesota Sch Kinesiol Human Sensorimotor Control Lab Minneapolis MN 55414 USA Meta Real Labs Hlth & Safety UXR Redmond WA USA Indiana Univ Sch Publ Hlth Sensorimotor Neurophysiol Lab Bloomington IN 47405 USA Univ Minnesota Ctr Clin Movement Sci Minneapolis MN 55414 USA

Finger position sense is a proprioceptive modality highly important for fine motor control. Its developmental time course is largely unknown. This cross-sectional study examined its typical development in 138 children (8-17 years) and a group of 14 healthy young adults using a fast and novel psychophysical test that yielded objective measures of position sense acuity. Participants placed their hands underneath a computer tablet and judged the perceived position of their unseen index finger relative to two visible areas displayed on a tablet following a two-forced-choice paradigm. Responses were fitted to a psychometric acuity function from which the difference between the point-of-subjective-equality and the veridical finger position (Delta PSE) was derived as a measure of position sense bias, and the uncertainty area (UA) as a measure of precision. The main results are: First, children under 12 exhibited a significantly greater UA than adults while adolescent children (13-17 years) exhibited no significant differences when compared to adults. Second, no significant age-related differences in Delta PSE were found across the age range of 8-17 years. This implies that the typical development of finger position sense from late childhood to adulthood is characterized as an age-dependent increase in proprioceptive precision and not as a decrease in bias.

关键词： development human psychophysics proprioception

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Dyad motor learning in a wrist-robotic environment: Learning together is better than learning alone

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human MOVEMENT SCIENCE 2024年 93卷 103172页

作者： Winter, Leoni V. Panzer, Stefan Konczak, Juergen Univ Minnesota Sch Kinesiol Human Sensorimotor Control Lab Minneapolis MN 55455 USA Univ Minnesota Ctr Clin Movement Sci Minneapolis MN USA Univ Saarbrucken Saarbrucken Germany Texas A&M Univ Dept Hlth & Kinesiol Kingsville TX 77843 USA

Objective: Dyad motor practice is characterized by two learners alternating between physical and observational practice, which can lead to better motor outcomes and reduce practice time compared to physical practice alone. Robot-assisted therapy has become an established neurorehabilitation tool but is limited by high therapy cost and access. Implementing dyad practice in robot-assisted rehabilitation has the potential to improve therapeutic outcomes and/or to achieve them faster. This study aims to determine the effects of dyad practice on motor performance in a wrist-robotic environment to evaluate its potential use in robotic rehabilitation settings. Methods: Forty-two healthy participants (18-35 years) were randomized into three groups (n = 14): Dyad practice, physical practice with rest and physical practice without rest. Participants practiced a 2 degree-of-freedom gamified wrist movement task for 20 trials using a custom-made wrist robotic device. A motor performance score (MPS) that captured temporal and spatial timeseries kinematics was computed at baseline, the end of training and 24 h later to assess retention. Results: MPS did not differ between groups at baseline. All groups revealed significant performance gains by the end of training. However, dyads outperformed the other groups at the end of training (p < 0.001) and showed higher retention after 24-h (p = 0.02). Median MPS improved by 46.5% in dyads, 25.3% in physical practice-rest, and 33.6% in physical practice-no rest at the end of training compared to baseline. Conclusion: Compared to physical practice alone, dyad practice leads to superior motor outcomes in a robot-assisted motor learning task. Dyads still outperformed their counterparts 24-h after practice. Impact statement: Improving motor function in complex motor tasks without increasing required practice time, dyad practice can optimize therapeutic resources. This is particularly impactful in robot-assisted rehabilitation regimens as it wou

关键词： human Motor control Robotic rehabilitation Wrist

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A Robotic Device for Measuring human Ankle Motion Sense

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IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING 2023年 31卷 2822-2830页

作者： Huang, Qiyin Zhong, Bin Elangovan, Naveen Zhang, Mingming Konczak, Jurgen Univ Minnesota Ctr Clin Movement Sci Human Sensorimotor Control Lab Minneapolis MN 55455 USA Univ Minnesota Sch Kinesiol Minneapolis MN 55455 USA Southern Univ Sci & Technol Dept Biomed Engn Shenzhen Key Lab Smart Healthcare Engn Shenzhen 518055 Guangdong Peoples R China

Proprioceptive signals about ankle motion are essential for the control of balance and gait. However, objective, accurate methods for testing ankle motion sense in clinical settings are not established. This study presents a fast and accurate method to assess human ankle motion sense acuity. A one degree-of-freedom (DOF) robotic device was used to passively rotate the ankle under controlled conditions and applied a psychophysical forced-choice paradigm. Twenty healthy participants were recruited for study participation. Within a trial, participants experienced one of three reference velocities (10 degrees/s, 15 degrees/s, and 20 degrees/s), and a smaller comparison velocity. Subsequently, they verbally indicated which of the two movements was faster. As outcome measures, a just-noticeable-difference (JND) threshold and interval of uncertainty (IU) were derived from the psychometric stimulus-response difference function for each participant. Our data show that mean JND threshold increased almost linearly from 0.53 degrees/s at the 10 degrees/s reference to 1.6 degrees/s at 20 degrees/s (p < 0.0001). Perceptual uncertainty increased similarly (median IU = 0.33 degrees/s at 10 degrees/s and 0.97 degrees/s at 20 degrees/s;p < 0.0001). Both measures were strongly correlated (r(s) = 0.70). This implies that the bias of the human ankle motion sense is approximately 5 - 8% of the experienced movement velocity. We demonstrate that this robot-aided test produces quantitative data on human ankle motion sense acuity. It provides a useful addition to the current measures of ankle proprioceptive function.

关键词： human motion measurement psychometric testing rehabilitation robotics velocity

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NECK MOVEMENT CLASSIFICATION USING SURFACE ELECTROMYOGRAPHY: A NOVEL LINEAR ALGORITHM BASED ON MUSCLE COORDINATION

NECK MOVEMENT CLASSIFICATION USING SURFACE ELECTROMYOGRAPHY:...

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Design of Medical Devices Conference (DMD) held as part of the Institute-for-Engineering-in-Medicine's Innovation Week

作者： Zhu, Yi Mahnan, Arash Konczak, Jurgen Univ Minnesota Sch Kinesiol Human Sensorimotor Control Lab Minneapolis MN 55417 USA

ISBN: (纸本)9780791884812

With a growing interest in real-time control of prostheses and wearable rehabilitation devices to treat motor dysfunction, there is a need to classify normal and abnormal body movement using kinematic and electrophysiological data. This paper presents a novel linear algorithm that can classify 10 distinct neck movements based on signals of only four surface electromyography (sEMG) electrodes. We here report on data of 5 healthy adults performing the 10 different neck movements: flexion/extension, right/left lateral flexion, right/left rotation, and four multiplanar directions. Surface EMG electrodes were attached to five locations: 1) left and right sternocleidomastoid, 2) left and right trapezius, and 3) the C7 spinal segment as reference. The algorithm yielded an accuracy of 92.5% in classifying six single-planar neck movement directions and an average accuracy of 81.2% in classifying all ten directions. The algorithm's performance was validated by comparing its accuracy with two conventional classification methods: Linear Discriminant Analysis (LDA) and Artificial Neural Network (ANN). The algorithm has 40% higher accuracy compared to LDA and the comparable accuracy of a three-layer ANN. The linearity and simplicity of the our algorithm enables its deployment on low-cost processors and systems. Future research will be focused on the classification of more complex neck movements and applications in neuromodulation devices.

关键词： Neck movement classification sEMG

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THE FEASIBILITY OF A ROBOTIC DEVICE TO OBJECTIVELY MEASURE ANKLE JOINT PROPRIOCEPTION

THE FEASIBILITY OF A ROBOTIC DEVICE TO OBJECTIVELY MEASURE A...

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Design of Medical Devices Conference (DMD) held as part of the Institute-for-Engineering-in-Medicine's Innovation Week

作者： Huang, Qiyin Zhong, Bin Elangovan, Naveen Zhang, Mingming Konczak, Jurgen Univ Minnesota Human Sensorimotor Control Lab Sch Kinesiol Minneapolis MN 55455 USA Southern Univ Sci & Technol Sensorimotor Rehabil Robot Lab Dept Biomed Engn Shenzhen Peoples R China

ISBN: (纸本)9780791884812

Proprioception is defined as the ability to sense limb and body position and motion. Proprioceptive signals originating from the mechanoreceptors around the ankle joint are critical for maintaining postural control and gait. Previous studies identified the detrimental effect of ankle somatosensory dysfunction on sensorimotor function such as balance control. However, a direct measure of ankle proprioception as a marker of proprioceptive dysfunction has not been identified. Recent advances in robotic rehabilitation devices allow precise movement of body segments while maintaining tight control over the exposed joint velocity. Here, we aim to design an ankle robot with 1-degree-of-freedom (DOF) - dorsiflexion/plantarflexion (DFPF) to objectively measure ankle joint proprioception in two aspects - joint position sense, and motion sense. To establish the feasibility of the device to evaluate ankle proprioceptive function, a small sample of healthy adult participants (n = 3) was recruited. A psychophysical 2-alternative forced-choice paradigm was employed for ankle position and motion sense evaluation. The ankle robot passively moved the ankle to one of two different positions or at two different stimulus velocities. Subsequently, participants verbally indicated the farthest position or the fastest motion. Based on their responses, a psychometric function was fitted, and a just-noticeable-difference (JND) threshold was established at the 75% correct response level, which served as a measure of ankle joint proprioception. The mean JND position threshold was 0.73 degrees +/- 0.01 degrees, and the mean JND motion threshold was 0.62 degrees/s +/- 0.05 degrees/s. Test-retest reliability tests in all three subjects yielded the reliability coefficients of r(T2-T1) = 0.974 for JND position threshold, and r(T2-T1) = 0.948 for JND motion threshold. We here demonstrate that the feasibility and reliability of this new device to assess ankle proprioceptive acuity.

关键词： Ankle joint Robot device proprioception

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Ankle proprioception in children with cerebral palsy

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JOURNAL OF PEDIATRIC REHABILITATION MEDICINE 2024年第1期17卷 75-83页

作者： Boyer, Elizabeth Huang, Qiyin Ngwesse, Stacy Nelson, Jennifer Oh, Jinseok Konczak, Jurgen Gillette Childrens Ctr Gait & Mot Anal 200 Univ Ave E St Paul MN 55101 USA Univ Minnesota Twin Cities Dept Orthoped Surg Minneapolis MN USA Univ Minnesota Twin Cities Human Sensorimotor Control Lab Sch Kinesiol Minneapolis MN USA Gillette Childrens Dept Res St Paul MN USA

PURPOSE: There is no established clinical standard to evaluate ankle proprioception in children with cerebral palsy (CP). This study compared ankle position sense of children with CP to age-matched children who are typically developing (TD). METHODS: Children aged 6-17 years participated (15 CP, 58 TD). Using a custom-built device, the ankle was passively rotated to two positions for 25 trials. Using a psychophysical forced-choice paradigm, participants indicated which position was more plantarflexed. A psychometric function was fitted to the response data to determine the just noticeable difference (JND) threshold and the associated uncertainty (random error) for ankle position sense. RESULTS: Median JND thresholds for the CP group were elevated (CP: 4.3 degrees, TD: 3.0 degrees). Three children with CP exceeded the 95th percentile of TD. No differences in random error were found. CONCLUSION: This method assessed ankle proprioception relative to norm data and identified position sense impairments in children with CP. Using this method can provide data on proprioceptive status in CP, augmenting the assessment of motor impairment.

关键词： Balance human position sense somatosensory kinesthesia

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Robot-aided assessment and associated brain lesions of impaired ankle proprioception in chronic stroke

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JOURNAL OF NEUROENGINEERING AND REHABILITATION 2024年第1期21卷 1-12页

作者： Huang, Qiyin Elangovan, Naveen Zhang, Mingming Van de Winckel, Ann Konczak, Jurgen Univ Minnesota Sch Kinesiol Human Sensorimotor Control Lab 1900 Univ Ave SE Minneapolis MN 55455 USA Univ Minnesota Ctr Clin Movement Sci 1900 Univ Ave SE Minneapolis MN 55455 USA Southern Univ Sci & Technol Dept Biomed Engn Shenzhen Key Lab Smart Healthcare Engn Shenzhen Peoples R China Univ Minnesota Med Sch Dept Family Med & Community Hlth Div Phys Therapy & Rehabil Sci Minneapolis MN USA

Background Impaired ankle proprioception strongly predicts balance dysfunction in chronic stroke. However, only sparse data on ankle position sense and no systematic data on ankle motion sense dysfunction in stroke are available. Moreover, the lesion sites underlying impaired ankle proprioception have not been comprehensively delineated. Using robotic technology, this study quantified ankle proprioceptive deficits post-stroke and determined the associated brain *** Twelve adults with chronic stroke and 13 neurotypical adults participated. A robot passively plantarflexed a participant's ankle to two distinct positions or at two distinct velocities. Participants subsequently indicated which of the two movements was further/faster. Based on the stimulus-response data, psychometric just-noticeable-difference (JND) thresholds and intervals of uncertainty (IU) were derived as measures on proprioceptive bias and precision. To determine group differences, Welch's t-test and the Wilcoxon-Mann-Whitney test were performed for the JND threshold and IU, respectively. Voxel-based lesion subtraction analysis identified the brain lesions associated with observed proprioceptive deficits in adults with *** 83% of adults with stroke exhibited abnormalities in either position or motion sense, or both. JND and IU measures were significantly elevated compared to the control group (Position sense: + 77% in JND, + 148% in IU;Motion sense: +153% in JND, + 78% in IU). Adults with stroke with both impaired ankle position and motion sense had lesions in the parietal, frontal, and temporoparietal *** This is the first study to document the magnitude and frequency of ankle position and motion sense impairment in adults with chronic stroke. Proprioceptive dysfunction was characterized by elevated JND thresholds and increased uncertainty in perceiving ankle position/motion. Furthermore, the associated cortical lesions for impairment in both proprioceptive sen

关键词： Motion sense Psychometrics Proprioception Robotics Stroke

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Assessing explicit processes does not influence the magnitude of implicit processes

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NEUROSCIENCE LETTERS 2022年 766卷 136341页

作者： Moghaddam, S. Heirani Decarie, A. Chua, R. Cressman, E. K. Univ Ottawa Fac Hlth Sci Sch Human Kinet Sensorimotor Control Lab Ottawa ON K1N 6N5 Canada Univ British Columbia Fac Educ Sch Kinesiol Perceptual Motor Dynam Lab Vancouver BC V6T 1Z1 Canada

Implicit (unconscious) and explicit (strategy) processes have been shown to contribute to visuomotor adaptation. Current methods, such as the Process Dissociation Procedure (PDP) and the Verbal Report Framework (VRF), simultaneously evaluate both implicit and explicit contributions to visuomotor adaptation. It is unclear whether the act of assessing explicit adaptation leads to variations in the magnitude of implicit adaptation observed. To address this question, four groups of participants adapted their reaches to a 40 degrees clockwise visuomotor rotation. Implicit and explicit adaptation were assessed in a PDP-IE group and a VRF-IE group following 3 blocks of rotated reach training trials. In contrast, only implicit adaptation was assessed at the same time points for a PDP-I group and VRF-I group. Results indicated a similar magnitude of implicit adaptation regardless of whether explicit adaptation was assessed or not. Thus, assessing explicit adaptation simultaneously with implicit adaptation following reach adaptation does not influence the magnitude of implicit adaptation established via the PDP and VRF methods.

关键词： Visuomotor adaptation Implicit adaptation Process dissociation procedure Verbal report framework

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Vibro-tactile stimulation of the neck induces head righting in people with cervical dystonia

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PARKINSONISM & RELATED DISORDERS 2025年 132卷 107263-107263页

作者： Avanzino, Laura Xu, Jiapeng Martino, Davide Conte, Antonella Standal, Stephanie Salehi, Parisa Terranova, Sara Bonassi, Gaia Alizadeh, Parisa Adeoti, Janet Adesewa Belvisi, Daniele Costanzo, Matteo Oh, Jinseok Konczak, Jurgen Univ Genoa Dept Expt Med Genoa Italy IRCCS Policlin San Martino Genoa Italy Univ Minnesota Sch Kinesiol Human Sensorimotor Control Lab Minneapolis MN USA Univ Calgary Dept Clin Neurosci Calgary AB Canada IRCCS Neuromed Pozzilli IS Italy Sapienza Univ Rome Dept Human Neurosci Rome Italy Univ Minnesota Dept Rehabil Med Phys Med & Rehabil Div Minneapolis MN USA Univ Genoa Dept Neurosci Rehabil Ophthalmol Genet Maternal & Genoa Italy Ist Super Sanita Dept Neurosci Rome Italy Univ Minnesota Ctr Clin Movement Sci Minneapolis MN USA

Introduction: Cervical dystonia (CD) is characterized by involuntary neck muscle spasms that lead to abnormal head movements or postures. It is associated with somatosensory (tactile and proprioceptive) dysfunction. Here we tested whether vibro-tactile stimulation (VTS) of the cervical muscles constitutes a non-invasive form of neuromodulation of the somatosensory system that can provide temporary symptom relief for people with CD. Material and method: In a multi-centre study, 67 CD patients (44 female) received VTS to sternocleidomastoid and/or trapezius muscles for up to 45 min under 9 different stimulation conditions. Retention was assessed 1, 5 and 20 min past VTS. Head angles and neck muscle EMG were recorded. The primary outcome measure was a head angle index (HAI), a composite measure reflecting the head deviation across the three axes of the head. Results: After identifying the most effective VTS condition for each participant, analysis showed that 85 % (57/ 67) of participants experienced an improvement in HAI of at least 10 % during the application of VTS. HAI improved by 50 % or higher in 26/67 of participants. For those responding to VTS, the effects tended to decay within 20 min. For the different CD phenotypes several stimulation sites could induce similarly large relative improvements in head posture. Conclusion: The study provides first systematic evidence that cervical VTS can induce fast-acting improvements in abnormal head posture in patients with CD. It demonstrates that a stimulation of somatosensory afferent networks modulates the innervation of dystonic muscles. It highlights the potential of cervical VTS as an adjuvant, non-invasive neuromodulation treatment in CD.

关键词： human Movement disorder Proprioception Somatosensory Vibration

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