scholarly journals Effects of robot viscous forces on arm movements in chronic stroke survivors: a randomized crossover study

2020 ◽  
Vol 17 (1) ◽  
Author(s):  
Yazan Abdel Majeed ◽  
Saria Awadalla ◽  
James L. Patton
Keyword(s):  
Chronic Stroke ◽  
Movement Speed ◽  
Institutional Review Boards ◽  
Stroke Survivors ◽  
Speed Increase ◽  
After Effects ◽  
Viscous Forces ◽  
Institutional Review ◽  
Wolf Motor Function Test ◽  
Negative Viscosity

Abstract Background Our previous work showed that speed is linked to the ability to recover in chronic stroke survivors. Participants moving faster on the first day of a 3-week study had greater improvements on the Wolf Motor Function Test. Methods We examined the effects of three candidate speed-modifying fields in a crossover design: negative viscosity, positive viscosity, and a “breakthrough” force that vanishes after speed exceeds an individualized threshold. Results Negative viscosity resulted in a significant speed increase when it was on. No lasting after effects on movement speed were observed from any of these treatments, however, training with negative viscosity led to significant improvements in movement accuracy and smoothness. Conclusions Our results suggest that negative viscosity could be used as a treatment to augment the training process while still allowing participants to make their own volitional motions in practice. Trial registration This study was approved by the Institutional Review Boards at Northwestern University (STU00206579) and the University of Illinois at Chicago (2018-1251).

scholarly journals Effects of Robot Viscous Forces on Arm Movements in Chronic Stroke Survivors: A Randomized Crossover Study

2020 ◽  
Author(s):  
Yazan Abdel Majeed ◽  
Saria Awadalla ◽  
James Patton
Keyword(s):  
Chronic Stroke ◽  
Movement Speed ◽  
Institutional Review Boards ◽  
Stroke Survivors ◽  
Speed Increase ◽  
After Effects ◽  
Viscous Forces ◽  
Institutional Review ◽  
Wolf Motor Function Test ◽  
Negative Viscosity

Abstract Background: Our previous work showed that speed is linked to the ability to recover in chronic stroke survivors. Participants moving faster on the first day of a three-week study had greater improvements on the Wolf Motor Function Test.Methods: We examined the effects of three candidate speed-modifying fields in a crossover design: negative viscosity, positive viscosity, and a "breakthrough" force that vanishes after speed exceeds an individualized threshold.Results: Negative viscosity resulted in a significant speed increase when it was on. No lasting after effects on movement speed were observed from any of these treatments, however, training with negative viscosity led to significant improvements in movement accuracy and smoothness.Conclusions: Our results suggest that negative viscosity could be used as a treatment to augment the training process while still allowing participants to make their own volitional motions in practice.Trial registration: This study was approved by the Institutional Review Boards at Northwestern University (STU00206579) and the University of Illinois at Chicago (2018-1251).

scholarly journals Effects of Robot Viscous Forces on Arm Movements in Chronic Stroke Survivors: A Randomized Crossover Study

2020 ◽  
Author(s):  
Yazan Abdel Majeed ◽  
Saria Awadalla ◽  
James Patton
Keyword(s):  
Test Methods ◽  
Chronic Stroke ◽  
Movement Speed ◽  
Institutional Review Boards ◽  
Stroke Survivors ◽  
Practice Trial ◽  
Speed Increase ◽  
Viscous Forces ◽  
Institutional Review ◽  
Negative Viscosity

Abstract Background Our previous work showed that speed is linked to the ability to recover in chronic stroke survivors. Patients moving faster on the first day of a three-week study had greater improvements on the Wolf Motor Function Test. Methods We examined the effects of three candidate speed-modifying fields in a crossover design: negative viscosity, positive viscosity, and a "breakthrough" force that vanishes after speed exceeds an individualized threshold. Results Negative viscosity resulted in a significant speed increase when it was on. No lasting after effects on movement speed were observed from any of these treatments, however, training with negative viscosity led to significant improvements in movement accuracy and smoothness. Conclusions Our results suggest that negative viscosity could be used as a treatment to augment the training process while still allowing patients to make their own volitional motions in practice. Trial registration This study was approved by the Institutional Review Boards at Northwestern University (STU00206579) and the University of Illinois at Chicago (2018-1251).

scholarly journals Effects of Robot Viscous Forces on Arm Movements in Chronic Stroke Survivors: A Randomized Crossover Study

2020 ◽  
Author(s):  
Yazan Abdel Majeed ◽  
Saria Awadalla ◽  
James Patton
Keyword(s):  
Chronic Stroke ◽  
Movement Speed ◽  
Institutional Review Boards ◽  
Stroke Survivors ◽  
Practice Trial ◽  
Speed Increase ◽  
Viscous Forces ◽  
Institutional Review ◽  
Negative Viscosity ◽  
The University

Abstract Background: Our previous work showed that speed is linked to the ability torecover in chronic stroke survivors. Participants moving faster on the rst day of a three-week study had greater improvements on the Wolf Motor Function Test.Methods: We examined the eects of three candidate speed-modifying elds in a crossover design: negative viscosity, positive viscosity, and a "breakthrough" force that vanishes after speed exceeds an individualized threshold.Results: Negative viscosity resulted in a signicant speed increase when it was on. No lasting after eects on movement speed were observed from any of these treatments, however, training with negative viscosity led to signicant improvements in movement accuracy and smoothness.Conclusions: Our results suggest that negative viscosity could be used as a treatment to augment the training process while still allowing participants to make their own volitional motions in practice. Trial registration: This study was approved by the Institutional Review Boards at Northwestern University (STU00206579) and the University of Illinois at Chicago (2018-1251).

scholarly journals Chronic Stroke Survivors Improve Reaching Accuracy by Reducing Movement Variability at the Trained Movement Speed

2017 ◽  
Vol 31 (6) ◽  
pp. 499-508 ◽  
Author(s):  
Ulrike Hammerbeck ◽  
Nada Yousif ◽  
Damon Hoad ◽  
Richard Greenwood ◽  
Jörn Diedrichsen ◽  
...  
Keyword(s):  
Chronic Phase ◽  
Training Group ◽  
Chronic Stroke ◽  
Movement Speed ◽  
Stroke Survivors ◽  
Movement Variability ◽  
Reaching Task ◽  
Arm Reaching ◽  
Fast Training ◽  
Elbow Movement

Background. Recovery from stroke is often said to have “plateaued” after 6 to 12 months. Yet training can still improve performance even in the chronic phase. Here we investigate the biomechanics of accuracy improvements during a reaching task and test whether they are affected by the speed at which movements are practiced. Method. We trained 36 chronic stroke survivors (57.5 years, SD ± 11.5; 10 females) over 4 consecutive days to improve endpoint accuracy in an arm-reaching task (420 repetitions/day). Half of the group trained using fast movements and the other half slow movements. The trunk was constrained allowing only shoulder and elbow movement for task performance. Results. Before training, movements were variable, tended to undershoot the target, and terminated in contralateral workspace (flexion bias). Both groups improved movement accuracy by reducing trial-to-trial variability; however, change in endpoint bias (systematic error) was not significant. Improvements were greatest at the trained movement speed and generalized to other speeds in the fast training group. Small but significant improvements were observed in clinical measures in the fast training group. Conclusions. The reduction in trial-to-trial variability without an alteration to endpoint bias suggests that improvements are achieved by better control over motor commands within the existing repertoire. Thus, 4 days’ training allows stroke survivors to improve movements that they can already make. Whether new movement patterns can be acquired in the chronic phase will need to be tested in longer term studies. We recommend that training needs to be performed at slow and fast movement speeds to enhance generalization.

scholarly journals Two weeks of ischemic conditioning improves walking speed and reduces neuromuscular fatigability in chronic stroke survivors

2019 ◽  
Vol 126 (3) ◽  
pp. 755-763 ◽  
Author(s):  
Matthew J. Durand ◽  
Timothy F. Boerger ◽  
Jennifer N. Nguyen ◽  
Saad Z. Alqahtani ◽  
Michael T. Wright ◽  
...  
Keyword(s):  
Pilot Study ◽  
Muscle Fatigue ◽  
Sham Group ◽  
Walking Speed ◽  
Knee Extensor ◽  
Cost Effective ◽  
Chronic Stroke ◽  
Stroke Survivors ◽  
Speed Increase ◽  
Ischemic Conditioning

This pilot study examined whether ischemic conditioning (IC), a noninvasive, cost-effective, and easy-to-administer intervention, could improve gait speed and paretic leg muscle function in stroke survivors. We hypothesized that 2 wk of IC training would increase self-selected walking speed, increase paretic muscle strength, and reduce neuromuscular fatigability in chronic stroke survivors. Twenty-two chronic stroke survivors received either IC or IC Sham on their paretic leg every other day for 2 wk (7 total sessions). IC involved 5-min bouts of ischemia, repeated five times, using a cuff inflated to 225 mmHg on the paretic thigh. For IC Sham, the cuff inflation pressure was 10 mmHg. Self-selected walking speed was assessed using the 10-m walk test, and paretic leg knee extensor strength and fatigability were assessed using a Biodex dynamometer. Self-selected walking speed increased in the IC group (0.86 ± 0.21 m/s pretest vs. 1.04 ± 0.22 m/s posttest, means ± SD; P < 0.001) but not in the IC Sham group (0.92 ± 0.47 m/s pretest vs. 0.96 ± 0.46 m/s posttest; P = 0.25). Paretic leg maximum voluntary contractions were unchanged in both groups (103 ± 57 N·m pre-IC vs. 109 ± 65 N·m post-IC; 103 ± 59 N·m pre-IC Sham vs. 108 ± 67 N·m post-IC Sham; P = 0.81); however, participants in the IC group maintained a submaximal isometric contraction longer than participants in the IC Sham group (278 ± 163 s pre-IC vs. 496 ± 313 s post-IC, P = 0.004; 397 ± 203 s pre-IC Sham vs. 355 ± 195 s post-IC Sham; P = 0.46). The results from this pilot study thus indicate that IC training has the potential to improve walking speed and paretic muscle fatigue resistance poststroke. NEW & NOTEWORTHY This pilot study is the first to demonstrate that ischemic conditioning can improve self-selected walking speed and reduce paretic muscle fatigue in stroke survivors. Ischemic conditioning has been shown to be safe in numerous patient populations, can be accomplished at home or at the bedside in only 45 min, and requires no specialized training. Future larger studies are warranted to determine the efficacy of ischemic conditioning as a neurorehabilitation therapy poststroke.

Aerobic locomotor exercise modulates brain activation patterns in chronic stroke survivors

2005 ◽  
Vol 32 (S 4) ◽  
Author(s):  
A.R Luft ◽  
L Forrester ◽  
F Villagra ◽  
R Macko ◽  
D.F Hanley
Keyword(s):  
Brain Activation ◽  
Chronic Stroke ◽  
Stroke Survivors ◽  
Activation Patterns

scholarly journals Alterations in Muscle Networks in the Upper Extremity of Chronic Stroke Survivors

2021 ◽  
pp. 1-1
Author(s):  
Michael Houston ◽  
Xiaoyan Li ◽  
Ping Zhou ◽  
Sheng Lia ◽  
Jinsook Roh ◽  
...  
Keyword(s):  
Upper Extremity ◽  
Chronic Stroke ◽  
Stroke Survivors

scholarly journals Barriers to Development of an App for Improving Staff-Family Communication at Israeli Geriatric Facilities

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 192-193
Author(s):  
Rinat Cohen ◽  
Gal Maydan ◽  
Shai Brill ◽  
Jiska Cohen-Mansfield
Keyword(s):  
Mobile App ◽  
Institutional Review Boards ◽  
Staff Members ◽  
Institutional Review ◽  
Implementation Planning ◽  
Institutional Adoption ◽  
Communication Needs ◽  
The University ◽  
And Control ◽  
To Receive

Abstract Family caregivers (FCs) of institutionalized noncommunicative older persons reported multiple unmet communication needs focusing on the need to receive reliable and regular updates on the patient’s condition. We have developed a mobile app for improving communication between FCs and healthcare professionals (HPs), based on 152 interviews with FCs and 13 discussion groups with HPs from four Israeli geriatric facilities. Both parties participated in app planning, tailoring it to their needs and abilities. App use implementation encountered major obstacles including the bureaucratic process concerning signing contracts between the university and software development firms, which hindered the process for a full year; data security department required disproportionate security levels that interfered with user experience and delayed the development process; the study’s definition varied across different ethics/Helsinki committees (Institutional Review Boards; IRBs), which led to different demands, e.g., insurance for medical clinical trials although no drugs or medical device were involved; lack of cooperation by mid-level staff members despite the institutional adoption of the app project; low utilization by HPs resulted in FCs not receiving timely responses. Despite these and other obstacles, we tested app use for 15 months in one facility in a pre-post-design with intervention and control groups, and we have since begun testing it in another facility. FCs who had used the app had positive feedback and wished to continue using it. App use optimization requires implementation planning, assimilating changes in each facility’s work procedures and HP’s engagement and motivation and thus depends on institutional procedures and politics.

Sign in / Sign up

Export Citation Format

Share Document