The article, led by Shane J. T. Balthazaar of the University of Birmingham together with colleagues from the University of Bath, Keele University, and two of the UK’s regional spinal injuries centres, draws on the direct experience of three recent inpatient exercise-intervention trials, the wider spinal cord injury rehabilitation literature, and the perspectives of senior rehabilitation clinicians. Its central claim is sobering: fragmented care pathways, limited specialist capacity, workforce and bed pressures, complex research governance, and variable clinical practice collectively restrict recruitment, intervention delivery, and long-term follow-up in precisely the patient population where such research could deliver the greatest benefit.

To organise the analysis, the authors applied two widely used implementation science frameworks. The Consolidated Framework for Implementation Research, or CFIR, provides a structured way of mapping the multilevel factors that determine whether an intervention can actually be delivered in a real-world setting, from the characteristics of individuals to the inner workings of clinical systems. The RE-AIM framework, meanwhile, evaluates research impact across five dimensions: reach, effectiveness, adoption, implementation, and maintenance. By viewing the UK’s inpatient spinal cord injury rehabilitation landscape through these lenses, the team was able to move beyond anecdote and identify recurring, systemic obstacles that cut across individual centres and studies.

The physiological rationale for early exercise intervention is compelling. Spinal cord injury dramatically alters cardiovascular control, because disruption of sympathetic pathways below the lesion impairs blood pressure regulation and reduces the active muscle mass available to support circulation. Peak oxygen uptake, a key marker of cardiorespiratory fitness, is typically severely depressed after injury, and physical inactivity during and after rehabilitation accelerates the decline. Over the longer term, this constellation of changes elevates the risk of cardiovascular disease, metabolic dysfunction, and pressure-related complications, all of which erode health-related quality of life and impose substantial costs on health systems. Exercise interventions delivered during the subacute phase, when patients are already engaged with therapy services, could in principle establish durable physical activity habits before these secondary conditions become entrenched.

The trials that informed the perspective illustrate both the ambition and the fragility of this research agenda. Studies such as Arm-Crank Exercise Training, or ACET, and related protocols involving high-intensity interval training, cardiopulmonary exercise testing, and detailed physiological monitoring including electrocardiography and electromyography, require patients to commit considerable time and physical effort at a moment when they are grappling with the psychological aftermath of a life-changing injury. Inertial measurement units and validated questionnaires such as the Leisure Time Physical Activity Questionnaire for Spinal Cord Injury can capture activity patterns, but only if participants can be recruited, consented, assessed, and then followed up after discharge, a chain of events in which any broken link undermines the entire study.

Recruitment emerges as one of the most stubborn challenges. The authors highlight delayed access to specialist rehabilitation as a fundamental problem: patients may spend prolonged periods in acute hospitals or general rehabilitation units before reaching a spinal injuries centre, compressing the time available for research within an already short inpatient stay. Patient readiness is another critical factor. Approaching someone in the early days of adjustment to paralysis with a detailed consent process, baseline physiological testing, and a demanding exercise protocol raises genuine ethical and practical questions about burden. The authors argue for patient-centred and staged recruitment, in which information is introduced gradually, aligned with individual priorities, and timed to respect the patient’s clinical and emotional trajectory rather than the convenience of the trial timeline.

Competing clinical priorities compound the problem. Inpatient rehabilitation is structured around a multidisciplinary team delivering physiotherapy, occupational therapy, nursing care, bladder and bowel management, and psychological support, all within a fixed admission window. Research sessions compete directly with these therapy slots, and clinicians facing bed pressures and staffing shortfalls understandably prioritise clinical need over study procedures. The perspective identifies limited protected research time for clinicians as a key barrier: without dedicated sessions in job plans, research involvement becomes an unpaid addition to already stretched workloads. Research infrastructure also varies widely across centres, meaning that a trial feasible at one specialist unit may be impossible at another simply because of differences in embedded research staff, equipment, and governance support.

Governance, too, exacts a toll. The authors describe complex research and development approval processes that can delay study start-up and consume investigator time, alongside difficulties retaining participants once they are discharged into community settings that may be geographically distant from the recruiting centre. Follow-up assessments, which are essential for determining whether early exercise benefits persist, become logistically fraught when patients return to homes scattered across the country. The authors suggest that pragmatic and flexible trial designs, together with hybrid delivery models that combine inpatient sessions with remote or home-based components, could help bridge this gap, allowing interventions and measurements to continue beyond the hospital walls.

The proposed solutions form a coherent reform agenda. Earlier clinician involvement in study design would ensure that protocols fit clinical realities rather than colliding with them. Protected research time, embedded in clinical job plans, would convert goodwill into sustainable capacity. More coordinated research infrastructure and streamlined governance across the UK’s spinal injuries centres would reduce duplication and accelerate start-up. The authors also point to integrated knowledge translation, in which patients and clinicians help shape research questions from the outset, and to patient and lived experience input as essential for ensuring that studies address outcomes that matter to the people they aim to help. Aligning study procedures with patient priorities, they argue, is not a concession but a prerequisite for meaningful participation and for translating findings into routine practice.

The stakes extend beyond academia. The perspective arrives amid ongoing parliamentary and professional attention to spinal cord injury services in the UK, including work by the All-Party Parliamentary Group and the Multidisciplinary Association of Spinal Cord Injury Professionals, and against a backdrop of National Institute for Health and Care Excellence guidance that depends on an evidence base the current system struggles to generate. If exercise interventions delivered during inpatient rehabilitation can demonstrably improve long-term cardiovascular health, functional independence measured by tools such as the Spinal Cord Independence Measure, and quality of life, then embedding research within routine rehabilitation becomes a matter of health service design, not merely scientific curiosity. The authors’ conclusion is measured but urgent: the subacute phase offers an irreplaceable opportunity to build the evidence that will shape lifelong care after spinal cord injury, and the NHS must reorganise itself so that this opportunity is no longer lost to fragmentation, pressure, and inertia. The work was supported by Heart Research UK, and the authors declare no competing interests, framing their argument not as a complaint but as a practical roadmap for a system capable of turning rehabilitation wards into engines of discovery.

Subject of Research: Barriers to delivering spinal cord injury exercise research during inpatient rehabilitation in the UK NHS

Article Title: Perspectives and challenges for delivering spinal cord injury research and exercise interventions during inpatient rehabilitation in the UK

Article References: Balthazaar, S. J. T., Maher, J. L., Chiou, S.-Y., Bilzon, J. L. J., Chowdhury, J. R., Hariharan, R., El Masri, W. S., & Nightingale, T. E. (2026). Perspectives and challenges for delivering spinal cord injury research and exercise interventions during inpatient rehabilitation in the UK. BMC Medicine. https://doi.org/10.1186/s12916-026-05239-3

Image Credits: AI Generated

DOI: 10.1186/s12916-026-05239-3

Keywords: spinal cord injury, inpatient rehabilitation, exercise intervention, NHS, clinical trials, subacute rehabilitation, implementation science, CFIR, RE-AIM, recruitment, research governance, cardiovascular health

The study, led by Erika Renzi and colleagues including corresponding author Michele Innocenzio, is what methodologists call an overview of systematic reviews, a study of studies that sits at the very top of the evidence pyramid. Rather than examining individual trials, the team systematically gathered and analyzed reviews that had already synthesized primary research on multi-component healthcare interventions for adults aged sixty-five and older. To be included, a review had to evaluate interventions targeting older populations, which in the pooled evidence included people living with frailty, cognitive impairment, and dementia, and it had to report the use of at least one implementation theory, model, or framework, the conceptual scaffolding that researchers use to plan, execute, and evaluate the rollout of a health intervention. The search covered six major databases, including PubMed, CINAHL, Scopus, Web of Science, PsycINFO, and the Cochrane Library, from their inception through the end of December 2024, and the protocol was prospectively registered on PROSPERO under registration number CRD42023444113.

The methodological machinery behind the overview was deliberately rigorous. The authors followed the Cochrane Handbook for systematic reviews of health interventions and reported their work in line with the PRISMA 2020 statement, the international standard for transparent reporting of systematic reviews. After screening the literature, they included eight reviews in total: five systematic reviews, one systematic review with meta-analysis, and two scoping reviews. Together, these reviews covered a remarkable 16,727 older adults, giving the overview a substantial evidentiary footprint. Methodological quality of each included review was appraised with AMSTAR-2, a validated instrument for judging the reliability of systematic reviews, which allowed the team to weigh their conclusions with appropriate caution. The unit of analysis, however, was not the trials themselves but the implementation frameworks and outcome measures those reviews described.

Seven distinct implementation frameworks emerged from the analysis, and two names dominated the landscape. The first was RE-AIM, an acronym standing for Reach, Effectiveness, Adoption, Implementation, and Maintenance, which has become something of a lingua franca for researchers trying to think beyond average treatment effects and toward the practical realities of dissemination. The second was the framework developed by Proctor and colleagues, along with adaptations such as the version proposed by Peters and coworkers, which decomposes implementation into a set of discrete outcomes: acceptability, adoption, appropriateness, feasibility, fidelity, coverage, sustainability, penetration, and cost. Alongside these heavyweights, the reviews also employed process models such as Knowledge-to-Action and Knowledge Dissemination and Utilization, which describe stepwise pathways for moving research evidence into practice, as well as approaches like the Innovative Care for Chronic Conditions framework and the Continuity of Care model, which attend to the structural organization of health services around older patients.

The crucial analytical move in the overview was to map the outcomes reported across these reviews onto the implementation outcome domains defined by Proctor and colleagues and operationalized in the World Health Organization’s practical guide on implementation research. This mapping exposed a striking inconsistency. Implementation outcomes, the team found, were reported unevenly across the evidence base and were frequently inferred from proxy indicators, indirect measurements such as attendance rates or staff survey responses, rather than from instruments explicitly aligned with WHO definitions. In other words, even when researchers believed they were evaluating implementation, they were often measuring something adjacent to it, leaving readers to guess whether two studies reporting the same outcome label were actually capturing the same phenomenon.

Some outcomes fared better than others. Acceptability, the degree to which an intervention is judged agreeable and satisfactory by its recipients and providers, was the only implementation outcome consistently reported across all eight reviews, suggesting that the patient and caregiver experience is now firmly on the research agenda. Adoption, the willingness of organizations and practitioners to take up an intervention, along with coverage and sustainability, were assessed in some reviews but not others, producing a patchy picture of how often programs actually enter routine care and survive there. At the bottom of the hierarchy sat appropriateness and feasibility, each evaluated in only three of the eight reviews, and implementation costs received similarly sparse attention. These omissions matter enormously, because a program that older adults enjoy but that no clinic can afford, staff, or schedule is a program that will never reach scale.

The authors interpret this pattern as a gap between the nominal use of implementation frameworks and their consistent operationalization, a gap with two roots. The first is structural: not every framework covers the full set of implementation outcomes, so a team that adopts RE-AIM, for instance, may simply have no designated slot for measuring appropriateness or cost. The second is behavioral: primary studies apply outcome definitions inconsistently, so even when a framework does specify what should be measured, the underlying trials supply data in incompatible forms. The result is an evidence base in which the vocabulary of implementation science is widely spoken but its grammar is applied loosely, making it difficult to compare programs, aggregate findings, or draw confident conclusions about which strategies actually get multi-component interventions into the hands of older adults who need them.

Why should the general reader care about what looks like an arcane dispute over outcome definitions? Because the demographic stakes could hardly be higher. Societies across Europe, North America, and Asia are aging rapidly, and the dream of active ageing, preserving physical, cognitive, and social function deep into later life, depends on interventions that are inherently multi-component and therefore inherently complex to deliver. Frailty, cognitive impairment, and dementia are precisely the conditions where fragmented, single-domain care fails, and where coordinated programs combining exercise, nutrition, cognition, and social support show the greatest promise. Every implementation failure represents lost health for older people and wasted resources for health systems already strained by rising demand. Standardized, comparable implementation evidence is the infrastructure that would let policymakers know not just whether a program can work, but whether it will work in their hospitals, clinics, and communities.

The overview, which was supported by the Next Generation EU programme through the National Recovery and Resilience Plan as part of the AGE-IT project on ageing well in an ageing society, closes with a clear prescription rather than a shrug. The authors call for more standardized reporting of implementation outcomes, explicit alignment with the definitions set out by Proctor and colleagues and the WHO practical guide, and deliberate attention to the neglected domains of feasibility, appropriateness, and cost. They also note that reliance on proxy indicators should give way to measures that genuinely operationalize each outcome. None of this diminishes the value of the interventions themselves; instead, it reframes the challenge. The science of active ageing has largely solved the question of what to offer older adults. The next frontier, this overview makes plain, is proving, with the same rigor applied to clinical endpoints, that those offerings can actually be implemented, sustained, and scaled in the untidy reality of everyday care.

Subject of Research: Implementation science of multi-component interventions promoting active ageing in older adults

Article Title: How to ensure the implementability of multi-component interventions to improve active ageing in older people? An overview of the evidence of systematic reviews

Article References: Renzi, E., Parrinello, E., Innocenzio, M., Covelli, A., Baccolini, V., De Vito, C., Marzuillo, C., Cincotti, F., Villari, P., & Massimi, A. (2026). How to ensure the implementability of multi-component interventions to improve active ageing in older people? An overview of the evidence of systematic reviews. BMC Geriatrics. https://doi.org/10.1186/s12877-026-08325-6

Image Credits: AI Generated

DOI: 10.1186/s12877-026-08325-6

Keywords: active ageing, older adults, implementation science, systematic reviews, RE-AIM, Proctor framework, multi-component interventions, frailty, dementia, WHO practical guide, geriatrics, implementation outcomes