Evidence stratification of exercise effects across psychiatric and neurological domains in long COVID.
| Condition | Indirect evidence (non-long COVID populations) | Direct long COVID evidence | Expert-opinion/consensus recommendations | Key evidence gaps |
|---|---|---|---|---|
| Depression/MDD symptoms | Strong evidence from MDD (RCTs, SRs, MAs) showing reductions in depressive symptoms and relapse risk | Limited RCT evidence in long COVID; small trials suggest improvements in mood and QoL but no disorder-specific endpoints | Exercise recommended as adjunctive therapy, preferably supervised moderate-intensity aerobic ± resistance training | Lack of large RCTs in long COVID with validated psychiatric outcomes; unclear dose–response relationship |
| Anxiety symptoms | Robust evidence in anxiety disorders (RCTs, MAs) showing reduced anxiety sensitivity and physiological arousal | Very limited post-COVID specific data; heterogeneous symptom-level outcomes reported in rehabilitation studies | Moderate-intensity aerobic exercise recommended; individualized pacing advised | No long COVID specific anxiety disorder trials; unclear effect on severe anxiety phenotypes |
| PTSD | Strong evidence from PTSD populations supporting aerobic and mind–body interventions | No direct long COVID trials | Exercise as adjunct to trauma-focused therapy; yoga/tai chi often recommended | No long COVID specific PTSD studies; unclear interaction with post-viral neuroinflammation |
| Schizophrenia spectrum symptoms | Strong indirect evidence supporting improvements in negative symptoms, cognition, and cardiometabolic health | No direct evidence | Structured supervised exercise programs recommended | No long COVID specific studies; adherence in post-viral fatigue unknown |
| Bipolar spectrum symptoms | Limited psychiatric evidence suggests benefits but risk of mood destabilization | No direct evidence in long COVID | Low-to-moderate intensity exercise with clinical monitoring recommended | No data in post-viral populations; safety profile unclear |
| Neurological dysfunction (motor/cognitive sequelae) | Strong evidence from stroke, MS, neurodegeneration showing benefits in mobility, cognition, and function | Sparse direct evidence; small rehabilitation studies suggest improvements in function but limited neurological specificity | Structured aerobic + task-oriented rehabilitation recommended with supervision | No disease-specific long COVID neurological trials; unclear long-term neuroplastic effects |
| Cognitive impairment (“brain fog”) | Strong indirect evidence in mild cognitive impairments, dementia prevention, and depression-related cognitive dysfunction | Small RCTs and SRs show inconsistent or modest improvements in cognition; many negative or neutral findings | Moderate aerobic exercise with gradual progression suggested to support attention and processing speed | Lack of standardized cognitive endpoints; unclear responders vs. non-responders; symptom fluctuation not addressed |
| Autonomic dysfunction | Indirect evidence from autonomic disorders supports recumbent exercise and graded verticalization | Very limited direct evidence; mostly observational rehabilitation data | Recumbent or semi-recumbent aerobic training, slow progression, close monitoring advised | Lack of RCTs; unclear optimal progression protocols and safety thresholds |
This table presents an evidence map of exercise interventions across psychiatric and neurological domains in long COVID, categorizing the literature into four levels: (i) indirect evidence from non-long COVID populations, (ii) direct long COVID evidence, (iii) expert-opinion or consensus-based recommendations, and (iv) key evidence gaps. It highlights the imbalance between strong mechanistic and indirect support and the limited availability of high-quality, disorder-specific evidence in long COVID, and serves as a framework for the critical appraisal developed in the subsequent sections. This table provides a synthetic evidence overview; detailed references and critical appraisal of each evidence category are presented in the corresponding sections of the manuscript. MDD: major depressive disorder; RCTs: randomized controlled trials; SRs: systematic reviews; MAs: meta-analyses; QoL: quality of life; PTSD: post-traumatic stress disorder; MS: multiple sclerosis.