Even very slow running can benefit the brain, according to a study from the University of Tsukuba in Japan published on 27 September in the journal Imaging Neuroscience. Twenty-four healthy young adults completed ten-minute treadmill sessions at between 3 and 6 kilometres per hour, a pace closer to a brisk walk than a jog, with heart rates held at around 104 to 107 beats per minute. The sessions were compared against a period of sitting.
After the slow running, participants reported better mood, greater alertness and increased pleasure than after sitting. They also performed better on tests of attention and self-control, with faster reaction times following the run. Brain imaging showed stronger oxygen-rich blood signals in two areas of the left prefrontal cortex during cognitive tasks, a region associated with executive function and decision-making.
The most unusual finding concerned how the benefit might arise. The researchers measured head acceleration during running and found that it correlated with improved mood, explaining approximately 17 per cent of the variation in mood gains between individuals. They suggest that the repeated impacts of running transmit mechanical signals to the brain, a hypothesis they describe as new and challenging that will need further testing.
The limits of the study are clear and the authors say so. The sample was small and made up of young, healthy adults, the design did not compare running with walking at the same effort, and it examined only the effects of a single short session rather than long-term training. The result therefore cannot say whether very slow running outperforms walking, or whether the effects build over weeks of regular practice.
For everyday runners, the takeaway is modest but encouraging: the mental payoff of a run does not appear to depend on pace or duration. The authors argue that running may be viewed not simply as another exercise modality but as a biologically foundational form of human movement. It is a useful counterpoint to the performance-driven coverage elsewhere on this site, and a reminder that the easiest ten minutes of a training week may still be doing meaningful work.