Cited by 179Cardiovascular and exercise physiologyPhysical Activity and HealthAdvanced MRI Techniques and Applications

High intensity exercise decreases global brain glucose uptake in humans.

Kemppainen, Jukka, Aalto, Sargo, Fujimoto, Toshihiko, Kalliokoski, Kari K., Långsjö, Jaakko, Oikonen, Vesa, Rinne, Juha, Nuutila, Pirjo +1 more·2005·The Journal of Physiology

Abstract

Physiological activation increases glucose uptake locally in the brain. However, it is not known how high intensity exercise affects regional and global brain glucose uptake. The effect of exercise intensity and exercise capacity on brain glucose uptake was directly measured using positron emission tomography (PET) and [18 F]fluoro‐deoxy‐glucose ([18 F]FDG). Fourteen healthy, right‐handed men were studied after 35 min of bicycle exercise at exercise intensities corresponding to 30, 55 and 75% of on three separate days. [18 F]FDG was injected 10 min after the start of the exercise. Thereafter exercise was continued for another 25 min. PET scanning of the brain was conducted after completion of the exercise. Regional glucose metabolic rate (rGMR) decreased in all measured cortical regions as exercise intensity increased. The mean decrease between the highest and lowest exercise intensity was 32% globally in the brain (38.6 ± 4.6 versus 26.1 ± 5.0 μmol (100 g)−1 min−1, P < 0.001). Lactate availability during exercise tended to correlate negatively with the observed brain glucose uptake. In addition, the decrease in glucose uptake in the dorsal part of the anterior cingulate cortex (37%versus 20%, P < 0.05 between 30% and 75% of ) was significantly more pronounced in subjects with higher exercise capacity. These results demonstrate that brain glucose uptake decreases with increase in exercise intensity. Therefore substrates other than glucose, most likely lactate, are utilized by the brain in order to compensate the increased energy needed to maintain neuronal activity during high intensity exercise. Moreover, it seems that exercise training could be related to adaptive metabolic changes locally in the frontal cortical regions.

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Crossref · 10.1113/jphysiol.2005.091355

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Authors
Kemppainen, J., Aalto, S., Fujimoto, T., Kalliokoski, K. K., Långsjö, J., Oikonen, V., Rinne, J., Nuutila, P., & Knuuti, J.
Affiliations
  • University of Turku (FI)
  • Åbo Akademi University (FI)
  • Tohoku University (JP)
  • Turku PET Centre (FI)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2005-09-28
Volume
568
Issue
1
Pages
323-332
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2170725206
Cited by
179
References
51
Citations by year
2026: 5 · 2025: 9 · 2024: 6 · 2023: 9 · 2022: 5 · 2021: 8 · 2020: 10 · 2019: 12 · 2018: 8 · 2017: 15 · 2016: 13 · 2015: 15 · 2014: 6 · 2013: 4 · 2012: 4
FWCI
18.69
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Novo Nordisk Fonden
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
Keywords
high-intensity exercise, brain glucose uptake, regional cerebral glucose metabolism, exercise intensity, exercise capacity, anterior cingulate cortex, brain energy metabolism, training effects, cerebral blood flow
MeSH terms
Blood Glucose, Brain, Cerebrovascular Circulation, Energy Metabolism, Physical Exertion, Frontal Lobe, Glucose, Humans, Insulin, Male, Time Factors, Tomography, Emission-Computed, Exercise, Radiopharmaceuticals, Lactic Acid, Fluorodeoxyglucose F18

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