McGill University Study Investigates Lingering Neurological and Physical Symptoms of Long COVID

Unveiling the McGill Long COVID Study: A Deep Dive into Persistent Symptoms

McGill University researchers are spearheading a groundbreaking investigation into the lingering neurological and physical symptoms that plague many long COVID patients. This Canadian Institutes of Health Research (CIHR)-funded project, led by Professor Marie-Hélène Boudrias from the School of Physical and Occupational Therapy (SPOT), aims to unravel the brain changes underlying these debilitating effects. The study highlights McGill's pivotal role in advancing higher education-driven medical research, particularly in neurorehabilitation and neuroimaging, leveraging world-class facilities like the 7 Tesla MRI scanner at the Montreal Neurological Institute (The Neuro).

Long COVID, or post-acute sequelae of SARS-CoV-2 infection (PASC), refers to a range of symptoms persisting for months or years after the initial infection. In Canada, estimates suggest that up to 17% of adults who contracted COVID-19 experience these longer-term effects, translating to millions affected nationwide. For universities, this poses unique challenges, as students and faculty grapple with fatigue, cognitive fog, and autonomic dysfunction that disrupt academic performance and research productivity.

The Scope of Lingering Neurological Symptoms in Long COVID

Neurological manifestations form a core component of long COVID, often described as 'brain fog'—characterized by difficulties in concentration, memory, executive function, and processing speed. Patients report dizziness, headaches, sleep disturbances, and even neuropathy, where nerve damage leads to tingling or numbness in extremities. These symptoms stem from potential neuroinflammation, blood-brain barrier disruption, or persistent viral reservoirs in neural tissue, as explored in recent neuroimaging studies.

At McGill, Professor Boudrias, a neuroscientist and physiotherapist with expertise in brain network dynamics, is focusing on how COVID-19 alters respiratory and autonomic brain networks. Her BRAIN Lab collaborates with the Biosignals and Systems Lab to employ advanced multimodal assessments, including high-resolution functional MRI to map structural and functional brain changes. This approach promises insights into why some individuals, particularly those aged 35-60—the target demographic for this study—experience prolonged cognitive impairments.

• Common neurological symptoms: Brain fog (50-70% prevalence), memory loss, headaches, dizziness.
• Autonomic issues: Orthostatic intolerance, heart rate variability disruptions.
• Cognitive deficits: Up to 40% of survivors show measurable declines persisting over a year.

Physical Symptoms: Fatigue, Dyspnea, and Beyond

Physical lingering effects include profound fatigue, shortness of breath (dyspnea), muscle weakness, and exercise intolerance—symptoms that confine many to bed or limit daily activities. These are linked to mitochondrial dysfunction, immune dysregulation, and microvascular damage. In Canadian contexts, where winter climates exacerbate respiratory issues, these symptoms hit hard, especially among active university communities.

The McGill study incorporates physiological testing to measure heart rate, breathing patterns, and muscle responses, correlating them with brain imaging data. This comprehensive protocol—spanning online questionnaires, 2.5 hours of testing, and 2 hours of MRI—seeks to identify biomarkers for personalized rehabilitation strategies.

Explore the Boudrias Lab recruitment details for a firsthand look at the study's design.

McGill's Research Infrastructure and Expertise

McGill University's strengths in neuroscience position it uniquely for this research. The Neuro, home to Canada's only 7T MRI, enables unprecedented resolution of brain microstructures. Professor Boudrias' background in stroke rehabilitation and aging brain networks translates seamlessly to long COVID, where similar neural remodeling occurs. Her lab's prior work on neuroplasticity informs hypotheses about recovery trajectories.

CIHR funding underscores national priority, with McGill receiving millions for health research in recent competitions. This study exemplifies how Canadian universities drive public health innovation, training grad students in cutting-edge neuroimaging while addressing real-world health crises.

Photo by Sean Chen on Unsplash

Prevalence and Burden in Canada: A Higher Education Perspective

Public Health Agency of Canada data indicates 21.7% of adults with long-term symptoms face daily limitations in activities like preparing meals or working. Universities report higher vulnerability: repeated exposures in dorms and labs, combined with stress, amplify risks. A 2025 survey found 25-30% long COVID rates in postsecondary settings, impacting retention and mental health.

Faculty face productivity losses; one study noted 15% considering early retirement due to post-viral fatigue. McGill's initiative could inform campus policies, like extended leaves or cognitive accommodations.

Study Design and Participant Recruitment

The cohort targets 200 Montreal-area adults aged 35-60: half with physician-diagnosed long COVID (symptoms >3 months post-infection), half healthy controls. After a 1-hour online eligibility session, participants undergo detailed assessments. Compensation covers time and travel, promoting inclusivity.

Recruitment via longcovid.study@mcgill.ca or Prof. Boudrias (514-398-5457) emphasizes diverse representation, including equity-deserving groups affected disproportionately.

Past McGill Contributions and Canadian Landscape

McGill's legacy includes the Quebec Action for Post-COVID (QAPC) study tracking symptom evolution via apps and cognitive tests. Virtual rehab trials showed promise for fatigue management. Nationally, McMaster's CANPCC guidelines offer 100+ recommendations, while UBC hosts symposia.

Universities like UofT and Toronto General pioneer biomarkers, fostering inter-institutional collaborations vital for scaling solutions.

Challenges in Long COVID Research and Higher Ed Responses

Heterogeneity of symptoms complicates trials; no universal diagnostic yet. McGill addresses this with multimodal data integration. Campuses adapt via wellness centers, pacing workshops, and research sabbaticals. Future: AI-driven symptom prediction from MRI data.

Photo by Ivo Oskar on Unsplash

Implications for University Communities and Future Outlook

Findings could revolutionize neurorehab curricula at McGill SPOT, training therapists for post-viral care. For affected academics, early interventions mean sustained careers. As Canada eyes Long COVID awareness month 2026, university research accelerates hope.

Stakeholders urge policy: dedicated funding, student supports. McGill's study exemplifies higher ed's societal impact.

Actionable Insights and How to Get Involved

• Monitor symptoms: Track fatigue, cognition via apps.
• Seek rehab: Pacing, breathing exercises per guidelines.
• Support research: Refer colleagues to McGill study.
• Advocate: Push unis for Long COVID policies.

McGill's effort signals progress; participation drives discovery.