Why Long-Term Exercise Recommendations During COVID-19 May Be Detrimental

With millions of individuals suffering from long-term symptoms of coronavirus, researchers are exploring effective strategies to alleviate these conditions. Resistance training presents a promising, drug-free, and affordable option that could potentially expedite recovery from long COVID infections. Despite its potential benefits, skepticism remains, with some experts claiming existing studies lack robustness, reminiscent of past debates on exercise for conditions like chronic fatigue syndrome.

Dr. Caroline Dalton from Sheffield Hallam University, UK, emphasizes the necessity for precision in defining exercise efficacy, warning against generalizing results to all long COVID patients.

One notable study led by Dr. Colin Berry at the University of Glasgow sought to investigate lifestyle interventions as long COVID emerged as a significant post-infection complication. Berry’s hypothesis was that exercise might serve as a viable alternative to lengthy drug development processes.

Berry’s team conducted a three-month resistance training program for participants with long COVID, assessing their performance improvements, including a notable increase of 83 meters on a timed walking test for those who completed the program compared to just 47 meters for the control group. The findings suggested resistance training could be a feasible treatment for persistent COVID-19 symptoms like fatigue and mobility issues.

Despite the enthusiasm surrounding the study, critical voices raised concerns about its findings. The difference in distance walked by both groups fell short of clinical significance, according to David Tuller from the University of California, Berkeley. Berry acknowledged that individual benefits need consideration beyond aggregated group data.

Another major criticism of the study relates to its diverse participant group. The inclusion of individuals with varying severity of COVID-19 infections meant the results could reflect broad averages rather than specific insights. According to Todd Davenport from the University of the Pacific, this diversity risks obscuring individual outcomes.

Understanding Post-Exercise Fatigue

Crucially, the study’s approach to assessing post-exertional fatigue—a debilitating symptom of chronic COVID-was limited. This condition causes severe fatigue after exertion, which often disproportionate to the activity level. Danny Altman at Imperial College London notes that effective evaluation of post-excretion fatigue can be challenging.

Unfortunately, fatigue assessment only occurred after the study, losing sight of early responses to exercise protocols. Alarmingly, at a three-month evaluation, 67% of participants reported inadequate recovery post-activity compared to 49% in the control group, potentially indicating greater setbacks for the intervention group, as shared by Leonard Jason from DePaul University.

Emerging research has also suggested that exercise may exacerbate certain symptoms, with a 2024 study highlighting potential muscle damage and mitochondrial dysfunction in individuals suffering from long COVID-related fatigue.

While Berry’s research sparked widespread debate, other studies support the notion that exercise can yield benefits for long COVID patients. A comprehensive review of 33 randomized controlled trials asserted that exercise significantly enhances the quality of life for affected individuals; however, it did not specifically address the prevalence of post-exercise fatigue, noted by over 80% of those surveyed.

The negative impact of post-exercise fatigue on quality of life was echoed by Margaret O’Hara, who highlighted the inadequacies of studies failing to consider this critical symptom.

Similarities to Chronic Fatigue Syndrome

This ongoing discussion echoes sentiments from chronic fatigue syndrome (CFS) studies, where post-exertional fatigue plays a central role. Landmark research suggested graded exercise therapy provided some benefit but has faced scrutiny since, per critiques regarding the modified definitions of improvement throughout the trial period.

As outlined in subsequent analyses, the recovery rates reported in these trials have come under fire for failing to capture realistic improvements, reiterating the complexity and varying responses in exercise interventions for exercise-related fatigue.

As national health organizations pivot away from generally endorsing graded exercise therapy for CFS, acknowledging the necessity for tailored management strategies, experts argue a similar consideration is warranted for long COVID cases. Such insights advocate for a subtyping strategy in research, honing in on individual symptoms to gather nuanced perspectives on exercise impacts.

Assessing Risks and Benefits

Acknowledging that current guidelines do not endorse graded exercise therapy for long COVID, further inquiries into varied forms of exercise interventions remain essential. “Long COVID” encompasses a range of conditions, prompting the need to discern effective exercise practices for different patient profiles.

Factors like persistent viral presence in specific individuals or immune system overreactions post-COVID necessitate individualized investigation.

Mike Ormerod, a long COVID volunteer, stresses the importance of advocating for informed medical advice and managing the narrative surrounding exercise recommendations. “Most doctors encourage physical activity under the belief that it’s universally beneficial, yet this can lead to detrimental outcomes for those with specific fatigue profiles,” cautions Dalton.