Neuroscience and psychology
Physical exercise improves motor symptoms and quality of life in Parkinson's disease
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Ainhoa Pérez
Alumni
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MPH, MSc.
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A recent systematic review and network meta-analysis evaluated the effectiveness of different types of physical exercise in Parkinson's disease, showing benefits on motor and functional symptoms. We discuss the main findings and their clinical implications.
CONCLUSION AND CLINICAL RELEVANCE In conclusion, this meta-analysis suggests that physical exercise, regardless of modality, is effective in reducing motor symptoms and improving quality of life in people with Parkinson's disease. Additionally, improvements in strength, balance, aerobic capacity, and overall functionality, which are determinants of autonomy and the prevention of complications arising from immobility, were observed. Regular physical activity may be more important than the type of intervention. Participation in group programs could improve aspects related to quality of life by improving mood and social isolation. However, this meta-analysis has significant limitations. The number of direct comparisons between modalities is very low, and most estimates come from indirect comparisons with the control group. This generates a weak evidence network that makes the order of interventions unreliable. The effect differences between the different interventions are generally small and have widely overlapping confidence intervals, so many of these apparent differences may be due to variability in measurements rather than true clinically relevant differences. In addition, there is high heterogeneity and limited methodological quality at several key points. The overall certainty of the evidence is low to moderate for most outcomes, which limits the strength of clinical recommendations. On the other hand, the benefits reach thresholds of statistical and clinical significance on relevant scales, although they are modest. However, most studies last only a few weeks, so the long-term effect needs to be evaluated more robustly. Future work should prioritize the design of individualized interventions, the inclusion of patients with greater clinical diversity, and the systematic reporting of outcomes, some physiological measurements, and longer follow-up.
PATHOPHYSIOLOGY AND MECHANISMS
Parkinson's disease, the second most common neurodegenerative disease in people over 60, is characterized by the progressive loss of dopaminergic neurons and the presence of Lewy bodies, generating motor symptoms (bradykinesia, rigidity, resting tremor, and postural instability) and non-motor symptoms (autonomic, digestive, mood and sleep disorders, cognitive impairment, etc.), which affect the quality of life of patients and their caregivers. Pharmacological treatment is symptomatic and its efficacy tends to decrease as the disease progresses. Physical exercise has the potential to improve motor symptoms and quality of life. It could also contribute to delaying progressive neuronal degeneration by facilitating neuroadaptations in different circuits, stimulating the release of neurotrophic factors (such as BDNF and GDNF), as well as sensitizing residual dopaminergic neurotransmission, promoting functional connectivity, blood flow, compensatory neuroplasticity, and reducing inflammation.STUDY
A Cochrane network systematic review and meta-analysis (Ernst et al., 2024) evaluated the comparative effectiveness of different types of physical exercise in adults with Parkinson's disease. The analysis included 154 randomized controlled clinical trials with nearly 8,000 participants, most of whom had mild to moderate disease. Structured interventions involving different types of physical exercise (aquatic, dance, walking/balance/functional, aerobic, strength, flexibility, walking and balance, multicomponent, video games, etc.) were compared with controls. The interventions lasted between 2 weeks and 2 years. The main outcomes were the severity of motor symptoms, quality of life, gait freezing, and functional mobility.MAIN RESULTS
The results show that physical exercise consistently produces improvements over control groups, both in motor symptoms and quality of life. In terms of improvement in motor symptoms, the greatest effect was found with dance and balance, gait, and functional training. Multicomponent, aquatic, strength, aerobic, and mind-body training showed a slightly lower effect estimate, although the confidence intervals suggest that the effects may not differ significantly. In relation to quality of life, aquatic exercise showed the highest effect estimate, followed by video game exercises, dance, balance/gait/functionality, multicomponent, and mind-body exercises, also with confidence intervals suggesting that the effect may not differ significantly. With regard to gait freezing and functional mobility, improvements were observed with most interventions, although the evidence is limited and the certainty of the results is generally low. Flexibility exercise shows an effect that suggests it could be counterproductive. Comparisons show benefits in both short- and long-term interventions, although the effects on mobility and balance increase with duration. Group interventions promote social interaction and adherence, with potential benefits on emotional and social symptoms. Adverse events (falls and pain) were rare; however, the evidence is limited and heterogeneous. Follow-up of the studies was very limited, so no data are available on sustained benefits in the medium or long term.CONCLUSION AND CLINICAL RELEVANCE In conclusion, this meta-analysis suggests that physical exercise, regardless of modality, is effective in reducing motor symptoms and improving quality of life in people with Parkinson's disease. Additionally, improvements in strength, balance, aerobic capacity, and overall functionality, which are determinants of autonomy and the prevention of complications arising from immobility, were observed. Regular physical activity may be more important than the type of intervention. Participation in group programs could improve aspects related to quality of life by improving mood and social isolation. However, this meta-analysis has significant limitations. The number of direct comparisons between modalities is very low, and most estimates come from indirect comparisons with the control group. This generates a weak evidence network that makes the order of interventions unreliable. The effect differences between the different interventions are generally small and have widely overlapping confidence intervals, so many of these apparent differences may be due to variability in measurements rather than true clinically relevant differences. In addition, there is high heterogeneity and limited methodological quality at several key points. The overall certainty of the evidence is low to moderate for most outcomes, which limits the strength of clinical recommendations. On the other hand, the benefits reach thresholds of statistical and clinical significance on relevant scales, although they are modest. However, most studies last only a few weeks, so the long-term effect needs to be evaluated more robustly. Future work should prioritize the design of individualized interventions, the inclusion of patients with greater clinical diversity, and the systematic reporting of outcomes, some physiological measurements, and longer follow-up.
#physicalexercise #Parkinson'sdisease #neurodegenerativediseases
References:
Ernst, M et al, 2024. Physical exercise for people with Parkinson's disease: a systematic review and network meta-analysis. Cochrane Database of Systematic Reviews, 2024(4), Art. No.: CD013856. https://doi.org/10.1002/14651858.CD013856.pub3
* The news published on studies do not represent an official position of ICNS, nor a clinical recommendation.
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