# Physical exercise as a non-pharmacological strategy to enhance glymphatic function

## TL;DR

Physical exercise improves brain waste clearance, reduces neurotoxic proteins, and lowers the risk of neurodegenerative diseases like Alzheimer’s.

## Contribution

This paper reviews how exercise enhances glymphatic function and identifies key mechanisms and research gaps.

## Key findings

- Exercise increases cerebrospinal fluid influx and perivascular clearance in preclinical and human studies.
- Aerobic and multicomponent exercise reduce amyloid-β accumulation and neuroinflammation in aging and Alzheimer’s models.
- Exercise improves cognitive performance, vascular health, and sleep quality, which support brain homeostasis.

## Abstract

The glymphatic system plays a critical role in clearing metabolic waste and neurotoxic proteins from the brain, and its dysfunction is implicated in neurodegenerative diseases such as Alzheimer’s disease (AD). Emerging evidence indicates that physical exercise enhances glymphatic function through multiple mechanisms, including increased cerebrospinal fluid (CSF) influx, improved perivascular clearance, astrocytic aquaporin-4 (AQP4) polarization, and modulation of vascular and sleep-dependent processes. Preclinical studies demonstrated that voluntary wheel running and aerobic exercise reduce amyloid-β (Aβ) accumulation, attenuate neuroinflammation, and improve cognitive performance in both aging and AD mouse models, with benefits being highly dependent on AQP4 expression and the timing of intervention. Translational evidence in humans showed that structured aerobic and multicomponent exercise increases glymphatic and meningeal lymphatic activity, enhances vascular dynamics, reduces systemic inflammation, and improves sleep quality, leading to measurable cognitive gains. Despite these promising findings, methodological challenges—such as limitations of non-invasive imaging, difficulty establishing causality, and reliance on short-term interventions—highlight the need for longitudinal, multimodal studies that integrate imaging, cardiovascular, sleep, and cognitive metrics. Collectively, these data suggest that exercise represents a potent non-pharmacological strategy to augment glymphatic clearance, preserve neural homeostasis, and reduce the risk of cognitive decline. This review will summarize evidence on exercise-induced glymphatic enhancement, highlight mechanisms, and identify research gaps for future studies on brain health.

Physical exercise enhances glymphatic function, promoting clearance of neurotoxic proteins like amyloid-β (Aβ) and reducing neuroinflammation. Mechanisms include increased CSF influx, improved perivascular clearance, astrocytic AQP4 polarization, and modulation of vascular and sleep-related processes. Preclinical and human studies show that aerobic and multicomponent exercise improve cognitive performance, vascular health, and sleep quality. Exercise thus represents a non-pharmacological strategy to preserve brain homeostasis and reduce the risk of neurodegenerative diseases, though further longitudinal and multimodal studies are needed.

Physical exercise enhances glymphatic function, promoting clearance of neurotoxic proteins like amyloid-β (Aβ) and reducing neuroinflammation. Mechanisms include increased CSF influx, improved perivascular clearance, astrocytic AQP4 polarization, and modulation of vascular and sleep-related processes. Preclinical and human studies show that aerobic and multicomponent exercise improve cognitive performance, vascular health, and sleep quality. Exercise thus represents a non-pharmacological strategy to preserve brain homeostasis and reduce the risk of neurodegenerative diseases, though further longitudinal and multimodal studies are needed.