
A new study shows for the first time that low and high exercise
intensities differentially influence brain function. Using resting state
functional magnetic resonance imaging (Rs-fMRI), a noninvasive
technique that allows for studies on brain connectivity, researchers
discovered that low-intensity exercise triggers brain networks involved
in cognition control and attention processing, while high-intensity
exercise primarily activates networks involved in affective/emotion
processing. The results appear in a special issue of
Brain Plasticity devoted to exercise and cognition.
“We believe that
functional neuroimaging
will have a major impact for unraveling body-brain interactions,” said
lead investigators Angelika Schmitt, MSc, and Henning Boecker, MD,
Functional Neuroimaging Group, Department of Radiology, University
Hospital Bonn, Bonn, Germany. “These novel methods allow us to ‘look’
directly into the brains of a group of athletes, and, maybe even more
importantly, understand the dynamic changes in
brain structure and function associated with the transition from a sedentary to a
healthy lifestyle.
Twenty-five male athletes underwent individual assessments using an
incremental treadmill test. On separate days they performed low- and
high-intensity exercise
bouts for 30 minutes. Before and after exercising, Rs-fMRI was used to
examine functional connectivity of different brain regions that are
linked to specific behavioral processes. Participants also completed a
questionnaire to measure positive and negative mood before and after the
exercise.
The behavioral data showed a significant increase in positive mood
after both exercise intensities and no significant change in negative
mood. The results of the Rs-fMRI tests showed that low-intensity
exercise led to increased functional connectivity in networks associated
with cognitive processing and attention. High-intensity exercise, on
the other hand, led to increased functional connectivity in networks
related to affective, emotional processes. High-intensity exercise also
led to a decreased functional connectivity in networks associated with
motor function.
The investigators note that this is the first study to report
distinct effects of exercise intensity on specific functional networks
within the brain at rest. Future research in this area will help provide
neurobiological evidence about what type of exercise intensity is best
suited for certain neurological or behavioral modulations and may pave
the way for supportive clinical applications in patients or for
enhancing brain functional plasticity.
More information:
Angelika Schmitt et al. Modulation of Distinct Intrinsic Resting State
Brain Networks by Acute Exercise Bouts of Differing Intensity,
Brain Plasticity (2019).
DOI: 10.3233/BPL-190081