Cited by 160Dementia and Cognitive Impairment ResearchPhysical Activity and HealthAlzheimer's disease research and treatments

Effects of Aerobic Exercise Training on Systemic Biomarkers and Cognition in Late Middle-Aged Adults at Risk for Alzheimer’s Disease

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Gaitán, Julian M., Moon, Hyo Youl, Stremlau, Matthew, Dubal, Dena B., Cook, Dane B., Okonkwo, Ozioma C., van Praag, Henriette·2021·Frontiers in Endocrinology

Abstract

Increasing evidence indicates that physical activity and exercise training may delay or prevent the onset of Alzheimer’s disease (AD). However, systemic biomarkers that can measure exercise effects on brain function and that link to relevant metabolic responses are lacking. To begin to address this issue, we utilized blood samples of 23 asymptomatic late middle-aged adults, with familial and genetic risk for AD (mean age 65 years old, 50% female) who underwent 26 weeks of supervised treadmill training. Systemic biomarkers implicated in learning and memory, including the myokine Cathepsin B (CTSB), brain-derived neurotrophic factor (BDNF), and klotho, as well as metabolomics were evaluated. Here we show that aerobic exercise training increases plasma CTSB and that changes in CTSB, but not BDNF or klotho, correlate with cognitive performance. BDNF levels decreased with exercise training. Klotho levels were unchanged by training, but closely associated with change in VO 2 peak. Metabolomic analysis revealed increased levels of polyunsaturated free fatty acids (PUFAs), reductions in ceramides, sphingo- and phospholipids, as well as changes in gut microbiome metabolites and redox homeostasis, with exercise. Multiple metabolites (~30%) correlated with changes in BDNF, but not CSTB or klotho. The positive association between CTSB and cognition, and the modulation of lipid metabolites implicated in dementia, support the beneficial effects of exercise training on brain function. Overall, our analyses indicate metabolic regulation of exercise-induced plasma BDNF changes and provide evidence that CTSB is a marker of cognitive changes in late middle-aged adults at risk for dementia.

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Crossref · 10.3389/fendo.2021.660181

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  • In humans, chronic exercise increases plasma cathepsin B.

    “although chronic exercise does increase plasma levels of cathepsin B145,157.”

    From Exerkines in health, resilience and disease (2022) · cites this paper as [145]

  • In animal models and humans, plasma cathepsin B is positively associated with hippocampus-dependent memory.

    “In both animal models and humans, plasma levels of cathepsin B, a lysosomal thiol proteinase produced by muscle, is positively associated with hippocampus-dependent memory145,157.”

    From Exerkines in health, resilience and disease (2022) · cites this paper as [145]

  • In humans, chronic exercise training does not consistently increase plasma BDNF; studies report no change, an increase, or a decrease.

    “whereas chronic exercise training has been shown to not alter140, increase or even decrease plasma levels of BDNF140,145.”

    From Exerkines in health, resilience and disease (2022) · cites this paper as [145]

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Authors
Gaitán, J. M., Moon, H. Y., Stremlau, M., Dubal, D. B., Cook, D. B., Okonkwo, O. C., & van Praag, H.
Affiliations
  • University of Wisconsin–Madison (US)
  • Seoul National University (KR)
  • National Institute on Aging (US)
  • University of California, San Francisco (US)
Corresponding author
Okonkwo, Ozioma C.
Venue
Frontiers in Endocrinology
Published
2021-05-20
Volume
12
Pages
660181-660181
ISSN
1664-2392 (ISSN-L)
OpenAlex
W3161410779
Cited by
160
References
136
Citations by year
2026: 39 · 2025: 33 · 2024: 32 · 2023: 34 · 2022: 20 · 2021: 2
FWCI
15.77
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Endocrinology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Seoul National University Open Repository (Seoul National University) (submittedVersion)
Funders
  • Alzheimer's Association
  • Extendicare Foundation
  • National Institutes of Health
  • Florida Department of Health
  • National Institute on Aging
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
aerobic exercise training, Alzheimer's disease risk, systemic biomarkers, cathepsin B, brain-derived neurotrophic factor, Klotho, cognitive performance, metabolomics, lipid metabolism, polyunsaturated fatty acids, ceramide, gut microbiota metabolites, redox homeostasis, peak oxygen uptake, treadmill training, middle-aged adults, dementia prevention
MeSH terms
Gastrointestinal Microbiome, Klotho Proteins, Aged, Aged, 80 and over, Alzheimer Disease, Cathepsin B, Cognition, Female, Humans, Hydroxyproline, Male, Middle Aged, Proline, Risk Factors, Biomarkers, Exercise, Fatty Acids, Omega-3, Brain-Derived Neurotrophic Factor, Lipid Metabolism, Metabolomics

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