Implementing Activity-Based Therapy for Spinal Cord Injury Rehabilitation in Canada: Challenges and Proposed Solutions.

Activity-based therapy (ABT) is a therapeutic approach with multiple benefits including promoting neurorecovery and reducing the likelihood of secondary complications in people living with spinal cord injury (SCI). Barriers and facilitators to ABT implementation for SCI rehabilitation have been studied from various perspectives through qualitative research. However, these viewpoints have not been synthesized to identify challenges of and strategies for implementing ABT across the Canadian healthcare system. Thus, the purpose of our study was to examine the current state of ABT in Canadian healthcare settings according to users' perspectives. Our main objectives were to compare barriers and facilitators to ABT implementation across Canadian healthcare settings according to users' perspectives and to identify optimal intervention strategies for ABT delivery across the Canadian healthcare system from acute to community care. We searched Scopus, CINAHL, OvidMedline, and other sources. Eligible articles were qualitative or mixed methods studies exploring ABT for adults with SCI in a Canadian healthcare setting. We analyzed qualitative findings through a thematic synthesis followed by a deductive content analysis. The Mixed Methods Appraisal Tool was used for critical appraisal. Nine articles were included. The thematic synthesis revealed two main themes: (1) factors influencing acceptance and adaptation of ABT across healthcare settings in Canada and (2) proposed solutions. The deductive analysis applied the Behaviour Change Wheel (BCW) to identify limited components of behaviour and appropriate interventions. To address ABT implementation challenges across the Canadian healthcare system, evidence-based interventions should target BCW subcategories of reflective motivation, social opportunity, and physical opportunity.

Functional electrical stimulation therapy for upper extremity rehabilitation following spinal cord injury: a pilot study.

STUDY DESIGN: Pilot study. OBJECTIVES: To examine if functional electrical stimulation therapy (FEST) improves neuromuscular factors underlying upper limb function in individuals with SCI. SETTING: A tertiary spinal cord rehabilitation center specialized in spinal cord injury care in Canada. METHODS: We examined 29 muscles from 4 individuals living with chronic, cervical, and incomplete SCI. The analysis was focused on the changes in muscle activation, as well as on how the treatment could change the ability to control a given muscle or on how multiple muscles would be coordinated during volitional efforts. RESULTS: There was evidence of gains in muscle strength, activation, and median frequency after the FEST. Gains in muscle activation indicated the activation of a greater number of motor units and gains in muscle median frequency the involvement of higher threshold, faster motor units. In some individuals, these changes were smaller but accompanied by increased control over muscle contraction, evident in a greater ability to sustain a volitional contraction, reduce the co-contraction of antagonist muscles, and provide cortical drive. CONCLUSIONS: FEST increases muscle strength and activation. Enhanced control of muscle contraction, reduced co-contraction of antagonist muscles, and a greater presence of cortical drive were some of the findings supporting the effects of FEST at the sensory-motor integration level.

Technology used in activity based therapy for individuals living with spinal cord injury across Canada.

STUDY DESIGN: Cross-sectional equipment inventory. OBJECTIVES: The objective of this study was to describe the equipment used in activity-based therapy (ABT) programs for individuals with spinal cord injury or disorder (SCI/D) across Canada. SETTINGS: Publicly funded and private SCI/D care settings. METHODS: A survey on equipment available for ABT for different therapeutic goals was answered by Canadian sites providing SCI/D rehabilitation. Information about the setting and type of client were also collected. The survey results were compiled into an inventory of the reported types and use of ABT related equipment, with equipment grouped into varying levels of technology. Descriptive statistics and qualitative descriptive analysis were used to answer the questions: (1) 'who' used the equipment, (2) 'what' types of equipment are used, (3) 'why' (i.e., for which therapeutic goals), and (4) 'how' it is used. RESULTS: Twenty-two sites from eight Canadian provinces completed the survey. Reported equipment was classified into 5 categories (from low to high-tech). Most equipment reported was used to train balance. The high-tech equipment reported as available, was mostly used for walking training and strengthening of the lower limbs. Low-tech equipment was reported as being used most frequently, while high-tech devices, although available, were reported as infrequently or rarely used. CONCLUSIONS: A large spectrum of equipment with varying levels of technology were reported as available, but were inconsistently used to provide ABT interventions across sites. In order to increase the clinical use of available equipment for ABT, education tools such as protocols regarding ABT principles and implementation are needed.

Using activity-based therapy for individuals with spinal cord injury or disease: Interviews with physical and occupational therapists in rehabilitation hospitals.

OBJECTIVE: To understand if and how physical therapists (PTs) and occupational therapists (OTs) use activity-based therapy (ABT) and its associated technologies for the rehabilitation of individuals living with spinal cord injury or disease (SCI/D) in Canadian rehabilitation hospital settings. DESIGN: Qualitative study. SETTING: Through rehabilitation hospitals participating in the Rick Hansen Spinal Cord Injury Registry, we recruited licensed OTs and PTs to participate in focus groups. PARTICIPANTS: Twelve PTs and ten OTs from nine sites across eight provinces participated. OUTCOME MEASURES: To inform the development of a semi-structured interview guide, we used the Theoretical Domains Framework. To analyze the data, we used interpretive description. RESULTS: We identified three themes that influenced therapists' use of ABT and associated technologies for SCI/D rehabilitation. (1) Therapists' decision-making approach to ABT and technology. Therapist roles, site-specific dynamics and goal setting influenced decision-making. Assuming roles such as mentor, liaison and advocate led to more ABT use. Site-specific dynamics concerned levels of ABT knowledge, teamwork, and staffing. In hospital rehabilitation, there was competition between discharge and neurorecovery goals. (2) Therapist perceived individual factors. Patient factors either increased (i.e. patients' motivation, self-advocacy) or prevented (i.e. mourning period, tolerance) the likelihood that ABT was introduced by therapists. (3) ABT and equipment access. Technology was used for ABT in a variety of ways. Access was affected by visible (e.g. equipment cost) and invisible barriers (e.g. departmental relations). CONCLUSIONS: The use of ABT and its associated technologies in Canadian rehabilitation hospitals is variable. Ongoing education could be offered, and site-specific implementation strategies could be developed, to promote ABT use.

Perspectives of people living with a spinal cord injury on activity-based therapy.

PURPOSE: Activity-Based Therapy (ABT) targets recovery of function below the injury level in individuals with spinal cord injury (SCI). This qualitative study is the first to capture the perspectives of individuals with SCI on community ABT programs in Canada. METHODS: Ten participants (6 males, aged 23.0-65.0 years, 2.5-23.0 years post-SCI) were recruited using purposive sampling, and completed semi-structured interviews. Interview questions explored benefits and challenges, facilitators and barriers to access, and motivations for participating in ABT. Themes were identified using conventional content analysis and collaboratively analyzed using the DEPICT model. RESULTS: An overarching theme of ABT as a key part of participants' evolving and lifelong recovery process emerged. Motivations for initiating ABT included dissatisfaction with early rehabilitation, and a desire to improve function and stay active. Participants perceived that ABT contributed to neurological recovery, physical and mental health benefits, independence, and hope. Factors contributing to recovery and factors limiting accessibility and participation in ABT were identified. Participants discussed advocating for ABT, and how ABT empowered self-management. CONCLUSIONS: ABT was perceived to play a significant role in promoting ongoing recovery and well-being in individuals with SCI. Addressing limitations in awareness and availability of ABT may improve participation in ABT programs.Implications for rehabilitationActivity-Based Therapy (ABT) targets recovery of function and sensation below the level of injury in individuals with spinal cord injury (SCI).ABT plays a key role in the evolving and lifelong recovery process of individuals with SCI.Participants reported that ABT has a positive impact on physical, functional, and psychosocial domains, leading to improved independence and quality of life.Awareness and availability of ABT remain limited, highlighting a need to further explore and address factors limiting access to this therapy.

The state of aquatic therapy use for clients with spinal cord injury or disorder: Knowledge and current practice.

CONTEXT/OBJECTIVES: Aquatic therapy (AT) has been reported to be beneficial for individuals with spinal cord injury or disorder (SCI/D); however, AT has also been reported to be underutilized in SCI/D rehabilitation. We aimed to understand the knowledge and current practice of AT for clients with SCI/D by physiotherapists, physiotherapy assistants and kinesiologists across Canada. DESIGN/METHOD: A survey with closed- and open-ended questions was distributed (July-October 2019) to professionals through letters sent by professional associations. Non-parametric analyses were used to compare AT knowledge and practice between AT and non-AT users; content analysis was used to identify the themes from open-ended questions. RESULTS: Seventy-eight respondents from 10 provinces were included in the analysis: 33 physiotherapists, 5 physiotherapy assistants and 40 kinesiologists. Respondents using AT (73%) reported greater knowledge of AT benefits and confidence to apply AT than respondents not using AT (p<0.01). Four themes were identified: 1-Variety of physical and psychosocial benefits of AT for people with SCI/D; 2-Attainment of movement and independence not possible on land; 3-Issues around pool accessibility; and 4-Constraints on AT implementation. CONCLUSIONS: Respondents implemented AT to improve health outcomes for patients with SCI/D, despite facing challenges with pool accessibility and numerous constraints. Respondents who provided AT reported having better knowledge of AT and a supported AT practice in the work environment than respondents not providing AT. This study will inform AT stakeholders and institutions when considering strategies to increase the access to AT after SCI/D.

Activity-based therapy in the community for individuals living with spinal cord injury or disease: qualitative interviews with clinicians.

PURPOSE: Activity-based therapy (ABT) is a restorative approach that promotes neurological recovery below the level of injury in individuals with spinal cord injury or disease (SCI/D). This study sought to understand how ABT and its associated technologies were being used in community-based facilities across Canada. METHODS: One to two participants from ten community-based ABT facilities completed a semi-structured interview that queried types of technologies or techniques used in ABT, and barriers and facilitators to providing ABT for individuals with SCI/D. Interviews were audio-recorded and transcribed verbatim, and analyzed using an interpretive description approach to identify themes and categories. RESULTS: The overarching theme that emerged was that ABT in the community is a client-centered approach characterized by variety in techniques, clinicians, and clientele. The researchers identified three categories within this theme: characteristics of ABT in the community, perceived challenges, and a need for advocacy. Participants advocated for earlier implementation, increased education, and reduced costs of ABT to address the challenges with implementation and accessibility. CONCLUSIONS: The use of ABT and its associated technologies varied across participating community-based facilities in Canada, despite a consistent focus on client goals and well-being. Addressing system-level limitations of ABT may improve implementation and accessibility in Canada.Implications for rehabilitationActivity-based therapy (ABT) is a group of interventions targeting recovery of sensory and motor function below the level of injury in individuals with spinal cord injury or disease (SCI/D).ABT in the community emphasizes a client-centered approach and is characterized by variety in techniques, clinicians, and clientele.Participants advocated that earlier implementation, reduced costs, and increased education will help overcome barriers to providing ABT, ultimately assisting to facilitate neurorecovery in individuals with SCI/D.Challenges in implementation, accessibility, and knowledge of ABT exist, highlighting a need to explore and address system-level limitations in Canada.

Changes to Biceps and Supraspinatus Tendons in Response to a Progressive Maximal Treadmill-Based Propulsion Aerobic Fitness Test in Manual Wheelchair Users: A Quantitative Musculoskeletal Ultrasound Study.

OBJECTIVE: To investigate if the completion of a recently developed treadmill-based wheelchair propulsion maximal progressive workload incremental test alters the integrity of the long head of the biceps and supraspinatus tendons using musculoskeletal ultrasound imaging biomarkers. METHOD: Fifteen manual wheelchair users completed the incremental test. Ultrasound images of the long head of the biceps and supraspinatus tendons were recorded before, immediately after, and 48 hours after the completion of the test using a standardized protocol. Geometric, composition, and texture-related ultrasound biomarkers characterized tendon integrity. RESULTS: Participants propelled during 10.2 ± 2.9 minutes with the majority (N = 13/15) having reached at least the eighth stage of the test (speed = 0.8 m/s; slope = 3.6°). All ultrasound biomarkers characterizing tendon integrity, measured in the longitudinal and transversal planes for both tendons, were similar (p = 0.063 to 1.000) across measurement times. CONCLUSION: The performance of the motorized treadmill wheelchair propulsion test to assess aerobic fitness produced no changes to ultrasound biomarkers of the biceps or supraspinatus tendons. Hence, there was no ultrasound imaging evidence of a maladaptive response due to overstimulation in these tendons immediately after and 48 hours after the performance of the test.

Comparison of the 6-Min Propulsion and Arm Crank Ergometer Tests to Assess Aerobic Fitness in Manual Wheelchair Users With a Spinal Cord Injury.

OBJECTIVE: The 6-Min Manual Wheelchair Propulsion Test is proposed to easily and rapidly assess aerobic fitness among long-term (≥3 mos) manual wheelchair users with spinal cord injury. However, aerobic responses to this test have not been established. This study aimed (1) to characterize aerobic responses during the 6-Min Manual Wheelchair Propulsion Test, (2) to establish parallel reliability between the 6-Min Manual Wheelchair Propulsion Test and the Maximal Arm Crank Ergometer Test, and (3) to quantify the strength of association between the total distance traveled during the 6-Min Manual Wheelchair Propulsion Test and peak oxygen consumption. DESIGN: Twenty manual wheelchair users with a spinal cord injury completed both tests. Aerobic parameters were measured before, during, and after the tests. Main outcome measures were peak oxygen consumption and total distance traveled. RESULTS: Progressive cardiorespiratory responses, consistent with guidelines for exercise testing, were observed during both tests. Similar peak oxygen consumption values were obtained during both tests (6-Min Manual Wheelchair Propulsion Test: 20.2 ± 4.9 ml/kg·min; Maximal Arm Crank Ergometer Test: 20.4 ± 5.0 ml/kg·min), were highly correlated (r = 0.92, P < 0.001), and had a good agreement (mean absolute difference = 0.21, 95% confidence interval = -0.70 to 1.11, P = 0.639). The peak oxygen consumption and total distance traveled (mean = 636.6 ± 56.9 m) during the 6-Min Manual Wheelchair Propulsion Test were highly correlated (r = 0.74, P < 0.001). CONCLUSIONS: The 6-Min Manual Wheelchair Propulsion Test induces progressive aerobic responses consistent with guidelines for exercise testing and can be used to efficiently estimate aerobic fitness in manual wheelchair users with a spinal cord injury. TO CLAIM CME CREDITS: Complete the self-assessment activity and evaluation online at http://www.physiatry.org/JournalCME CME OBJECTIVES: Upon completion of this article, the reader should be able to: (1) Explain how to administer the Six-Minute Manual Wheelchair Propulsion Test in long-term manual wheelchair users with a spinal cord injury; (2) Contrast how the workload is developed between the Six-Minute Manual Wheelchair Propulsion Test and the Maximal Arm Crank Ergometry Test and recognize how these differences may affect physiological responses; and (3) Explain why caution is advised regarding the use of the Six-Minute Manual Wheelchair Propulsion Test if aiming to estimate aerobic fitness. LEVEL: Advanced ACCREDITATION: The Association of Academic Physiatrists is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians.The Association of Academic Physiatrists designates this Journal-based CME activity for a maximum of 1.0 AMA PRA Category 1 Credit(s)™. Physicians should only claim credit commensurate with the extent of their participation in the activity.

Feasibility, Safety, and Preliminary Effectiveness of a Home-Based Self-Managed High-Intensity Interval Training Program Offered to Long-Term Manual Wheelchair Users.

OBJECTIVES: To investigate and compare the feasibility, safety, and preliminary effectiveness of home-based self-managed manual wheelchair high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT) programs. METHODS: Eleven manual wheelchair users were randomly assigned to the HIIT (n = 6) or the MICT group (n = 5). Both six-week programs consisted of three 40-minute propulsion training sessions per week. The HIIT group alternated between 30 s high-intensity intervals and 60 s low-intensity intervals, whereas the MICT group maintained a constant moderate intensity. Cardiorespiratory fitness, upper limb strength, and shoulder pain were measured before and after the programs. Participants completed a questionnaire on the programs that explored general areas of feasibility. RESULTS: The answers to the questionnaire demonstrated that both training programs were feasible in the community. No severe adverse events occurred, although some participants experienced increased shoulder pain during HIIT. Neither program yielded a significant change in cardiorespiratory fitness or upper limb strength. However, both groups reported moderate to significant subjective improvement. CONCLUSION: Home-based wheelchair HIIT appears feasible and safe although potential development of shoulder pain remains a concern and should be addressed with a future preventive shoulder exercise program. Some recommendations have been proposed for a larger study aiming to strengthen evidence regarding the feasibility, safety, and effectiveness of HIIT.

Reliability and minimal detectable change of a new treadmill-based progressive workload incremental test to measure cardiorespiratory fitness in manual wheelchair users.

BACKGROUND: Cardiorespiratory fitness training is commonly provided to manual wheelchair users (MWUs) in rehabilitation and physical activity programs, emphasizing the need for a reliable task-specific incremental wheelchair propulsion test. OBJECTIVE: Quantifying test-retest reliability and minimal detectable change (MDC) of key cardiorespiratory fitness measures following performance of a newly developed continuous treadmill-based wheelchair propulsion test (WPTTreadmill). METHODS: Twenty-five MWUs completed the WPTTreadmill on two separate occasions within one week. During these tests, participants continuously propelled their wheelchair on a motorized treadmill while the exercise intensity was gradually increased every minute until exhaustion by changing the slope and/or speed according to a standardized protocol. Peak oxygen consumption (VO2peak), carbon dioxide production (VCO2peak), respiratory exchange ratio (RERpeak), minute ventilation (VEpeak) and heart rate (HRpeak) were computed. Time to exhaustion (TTE) and number of increments completed were also measured. Intra-class correlation coefficients (ICC) were calculated to determine test-retest reliability. Standard error of measurement (SEM) and MDC90% values were calculated. RESULTS: Excellent test-retest reliability was reached for almost all outcome measures (ICC=0.91-0.76), except for RERpeak (ICC=0.58), which reached good reliability. TTE (ICC=0.89) and number of increments (ICC=0.91) also reached excellent test-retest reliability. For the main outcome measures (VO2peak and TTE), absolute SEM was 2.27 mL/kg/min and 0.76 minutes, respectively and absolute MDC90% was 5.30 mL/kg/min and 1.77 minutes, respectively. CONCLUSION: The WPTTreadmill is a reliable test to assess cardiorespiratory fitness among MWUs. TTE and number of increments could be used as reliable outcome measures when VO2 measurement is not possible.

Quantifying cardiorespiratory responses resulting from speed and slope increments during motorized treadmill propulsion among manual wheelchair users.

BACKGROUND: Cardiorespiratory fitness assessment and training among manual wheelchair (MW) users are predominantly done with an arm-crank ergometer. However, arm-crank ergometer biomechanics differ substantially from MW propulsion biomechanics. This study aimed to quantify cardiorespiratory responses resulting from speed and slope increments during MW propulsion on a motorized treadmill and to calculate a predictive equation based on speed and slope for estimating peak oxygen uptake (VO2peak) in MW users. METHODS: In total, 17 long-term MW users completed 12 MW propulsion periods (PP), each lasting 2min, on a motorized treadmill, in a random order. Each PP was separated by a 2-min rest. PPs were characterized by a combination of 3 speeds (0.6, 0.8 and 1.0m/s) and 4 slopes (0°, 2.7°, 3.6° and 4.8°). Six key cardiorespiratory outcome measures (VO2, heart rate, respiratory rate, minute ventilation and tidal volume) were recorded by using a gas-exchange analysis system. Rate of perceived exertion (RPE) was measured by using the modified 10-point Borg scale after each PP. RESULTS: For the 14 participants who completed the test, cardiorespiratory responses increased in response to speed and/or slope increments, except those recorded between the 3.6o and 4.8o slope, for which most outcome measures were comparable. The RPE was positively associated with cardiorespiratory response (rs≥0.85). A VO2 predictive equation (R2=99.7%) based on speed and slope for each PP was computed. This equation informed the development of a future testing protocol to linearly increase VO2 via 1-min stages during treadmill MW propulsion. CONCLUSIONS: Increasing speed and slope while propelling a MW on a motorized treadmill increases cardiorespiratory response along with RPE. RPE can be used to easily and accurately monitor cardiorespiratory responses during MW exercise. The VO2 can be predicted to some extent by speed and slope during MW propulsion. A testing protocol is proposed to assess cardiorespiratory fitness during motorized MW propulsion.

Wheelchair pushrim kinetics measurement: A method to cancel inaccuracies due to pushrim weight and wheel camber.

The commercially available SmartWheelTM is largely used in research and increasingly used in clinical practice to measure the forces and moments applied on the wheelchair pushrims by the user. However, in some situations (i.e. cambered wheels or increased pushrim weight), the recorded kinetics may include dynamic offsets that affect the accuracy of the measurements. In this work, an automatic method to identify and cancel these offsets is proposed and tested. First, the method was tested on an experimental bench with different cambers and pushrim weights. Then, the method was generalized to wheelchair propulsion. Nine experienced wheelchair users propelled their own wheelchairs instrumented with two SmartWheels with anti-slip pushrim covers. The dynamic offsets were correctly identified using the propulsion acquisition, without needing a separate baseline acquisition. A kinetic analysis was performed with and without dynamic offset cancellation using the proposed method. The most altered kinetic variables during propulsion were the vertical and total forces, with errors of up to 9N (p<0.001, large effect size of 5). This method is simple to implement, fully automatic and requires no further acquisitions. Therefore, we advise to use it systematically to enhance the accuracy of existing and future kinetic measurements.

Unsupported eyes closed sitting and quiet standing share postural control strategies in healthy individuals.

The study aimed to (1) compare postural stability between sitting and standing in healthy individuals and (2) define center-of-pressure (COP) measures during sitting that could also explain standing stability. Fourteen healthy individuals randomly maintained (1) two short-sitting positions with eyes open or closed, with or without hand support, and (2) one standing position with eyes open with both upper limbs resting alongside the body. Thirty-six COP measures based on time and frequency series were computed. Greater COP displacement and velocity along with lower frequency measures were found for almost all directional components during standing compared with both sitting positions. The velocity, 95% confidence ellipse area, and centroidal frequency were found to be correlated between unsupported sitting and standing. Despite evidenced differences between sitting and standing, similarities in postural control were highlighted when sitting stability was the most challenging. These findings support further investigation between dynamic sitting and standing balance.

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Center-of-pressure total trajectory length is a complementary measure to maximum excursion to better differentiate multidirectional standing limits of stability between individuals with incomplete spinal cord injury and able-bodied individuals.

BACKGROUND: Sensorimotor impairments secondary to a spinal cord injury affect standing postural balance. While quasi-static postural balance impairments have been documented, little information is known about dynamic postural balance in this population. The aim of this study was to quantify and characterize dynamic postural balance while standing among individuals with a spinal cord injury using the comfortable multidirectional limits of stability test and to explore its association with the quasi-static standing postural balance test. METHODS: Sixteen individuals with an incomplete spinal cord injury and sixteen able-bodied individuals participated in this study. For the comfortable multidirectional limits of stability test, participants were instructed to lean as far as possible in 8 directions, separated by 45° while standing with each foot on a forceplate and real-time COP visual feedback provided. Measures computed using the center of pressure (COP), such as the absolute maximal distance reached (COPmax) and the total length travelled by the COP to reach the maximal distance (COPlength), were used to characterize performance in each direction. Quasi-static standing postural balance with eyes open was evaluated using time-domain measures of the COP. The difference between the groups and the association between the dynamic and quasi-static test were analyzed. RESULTS: The COPlength of individuals with SCI was significantly greater (p ≤ 0.001) than that of able-bodied individuals in all tested directions except in the anterior and posterior directions (p ≤ 0.039), indicating an increased COP trajectory while progressing towards their maximal distance. The COPmax in the anterior direction was significantly smaller for individuals with SCI. Little association was found between the comfortable multidirectional limits of stability test and the quasi-static postural balance test (r ≥ -0.658). CONCLUSION: Standing dynamic postural balance performance in individuals with an incomplete spinal cord injury can be differentiated from that of able-bodied individuals with the comfortable limits of stability test. Performance among individuals with an incomplete spinal cord injury is characterized by lack of precision when reaching. The comfortable limits of stability test provides supplementary information and could serve as an adjunct to the quasi-static test when evaluating postural balance in an incomplete spinal cord injury population.

Influence of visual inputs on quasi-static standing postural steadiness in individuals with spinal cord injury.

Postural steadiness while standing is impaired in individuals with spinal cord injury (SCI) and could be potentially associated with increased reliance on visual inputs. The purpose of this study was to compare individuals with SCI and able-bodied participants on their use of visual inputs to maintain standing postural steadiness. Another aim was to quantify the association between visual contribution to achieve postural steadiness and a clinical balance scale. Individuals with SCI (n = 15) and able-bodied controls (n = 14) performed quasi-static stance, with eyes open or closed, on force plates for two 45 s trials. Measurements of the centre of pressure (COP) included the mean value of the root mean square (RMS), mean COP velocity (MV) and COP sway area (SA). Individuals with SCI were also evaluated with the Mini-Balance Evaluation Systems Test (Mini BESTest), a clinical outcome measure of postural steadiness. Individuals with SCI were significantly less stable than able-bodied controls in both conditions. The Romberg ratios (eyes open/eyes closed) for COP MV and SA were significantly higher for individuals with SCI, indicating a higher contribution of visual inputs for postural steadiness in that population. Romberg ratios for RMS and SA were significantly associated with the Mini-BESTest. This study highlights the contribution of visual inputs in individuals with SCI when maintaining quasi-static standing posture.

Comparison of multidirectional seated postural stability between individuals with spinal cord injury and able-bodied individuals.

OBJECTIVES: To compare multidirectional seated postural stability between individuals with spinal cord injury and able-bodied- individuals and to evaluate the impact of abdominal and low back muscle paralysis on multidirectional seated stability. DESIGN: Case-control study. PARTICIPANTS: Fifteen individuals with complete or incomplete spinal cord injury affecting various vertebral levels participated in this study and were gender-matched with 15 able-bodied individuals. METHODS: Participants were instructed to lean as far as possible in 8 directions, set apart by 45° intervals, while seated on an instrumented chair with their feet placed on force plates. Eight direction-specific stability indices and a global stability index were calculated. RESULTS: The global stability index and all direction-specific indices, except in the anterior and posterior directions, were lower in individuals with spinal cord injury than in able-bodied individuals. However, the individuals with spinal cord injury who had partial or full control of their abdominal and lower trunk muscles obtained a similar global stability index and similar direction-specific indices compared to the able-bodied individuals. CONCLUSION: Multidirectional seated postural stability is reduced in individuals with SCI who have paralysis of the abdominal and lower back muscles in comparison to able-bodied individuals.

Which trunk inclination directions best predict multidirectional-seated limits of stability among individuals with spinal cord injury?

OBJECTIVE: To determine which trunk inclination directions most accurately predict multidirectional-seated limits of stability among individuals with spinal cord injury (SCI). DESIGN: Predictive study using cross-sectional data. SETTING: Pathokinesiology Laboratory. PARTICIPANTS: Twenty-one individuals with complete or incomplete sensorimotor SCI affecting various vertebral levels participated in this study. INTERVENTIONS: Participants were instructed to lean their trunk as far as possible in eight directions, separated by 45° intervals, while seated on an instrumented chair with their feet positioned on force plates. OUTCOMES MEASURES: Eight direction-specific stability indices (DSIs) were used to define an overall stability index (OSI) (limits of stability). RESULTS: All DSIs significantly correlated with the OSI (r = 0.816-0.925). A protocol that only tests the anterior, left postero-lateral, and right lateral trunk inclinations accurately predicts multidirectional-seated postural stability (r(2) = 0.98; P < 0.001). CONCLUSION: Multidirectional-seated postural stability can be predicted almost perfectly by evaluating trunk inclinations performed toward the anterior, left postero-lateral, and right lateral directions.

Effects of upper limb positions and weight support roles on quasi-static seated postural stability in individuals with spinal cord injury.

Seated postural stability has not been studied extensively in individuals with spinal cord injury (SCI). The main purpose of this study was to compare the effects of upper limb (U/L) positions and U/L weight support roles on quasi-static postural stability between individuals with SCI and healthy controls. Fourteen individuals with SCI and 14 healthy controls sat on an instrumented seat with their feet resting on force plates and randomly maintained five short-sitting positions for 60s with or without hand support. Center-of-pressure (COP) measures based on displacement and frequency series were computed. Individuals with SCI exhibited greater mean COP displacement and velocity measures compared to healthy controls, as well as lower COP frequency measures, irrespective of the U/L positions and weight support roles, confirming reduced stability and a difference in preferential postural regulation strategies. The use of U/L support is a compensatory strategy that influences seated stability in individuals with SCI.