A recent study has shown that adolescents who engage in more daily walking report fewer mental health symptoms a year later. The research found that even an increment of 1,000 to 2,000 additional steps can correlate with better mental health outcomes among teens. Walking to school or playing in parks may enhance daily physical activity, which seems beneficial for mental health.
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Conducted by researchers from King’s College London’s Institute of Psychiatry, Psychology & Neuroscience in collaboration with the University of Massachusetts Amherst, the study tracked 5,515 adolescents as part of the Adolescent Brain Cognitive Development Study, one of the largest long-term studies of brain development and child health in the United States.
During the study, participants wore Fitbit devices for three weeks when they were about 11 to 12 years old. This method provided an objective assessment of daily physical activity, a contrast to previous studies that often relied on self-reported measures. A year later, researchers evaluated the participants' mental health using the Child Behavior Checklist, a standard questionnaire completed by both the adolescents and their parents.
The findings revealed that adolescents who took fewer than 5,000 steps daily exhibited the highest rates of mental health symptoms. Those averaging around 8,000 steps reported fewer symptoms, while those who achieved 12,000 or more steps experienced the least mental health issues. However, the study did not find a consistent correlation between higher step counts and academic performance.
Dr. Divyangana Rakesh, a senior lecturer in neuroscience and psychology at King’s College London and the study's senior author, noted that the evidence suggests even modest increases in daily steps can positively impact adolescent mental health and brain development. Notably, no plateau was observed in this correlation, indicating continuous benefits up to the highest measured activity levels.
Furthermore, participants who walked more had slightly thicker brain tissue in regions related to movement and emotional regulation. This finding offers a potential biological link between physical activity and mental well-being. Lead author Qingyang Li commented on the preliminary data, highlighting the ongoing investigation into the brain mechanisms involved.
Despite accounting for prior mental health issues, the association between step counts and mental health symptoms persisted, suggesting that increased physical activity may foster improved mental health, though the research design does not confirm a direct cause-and-effect relationship.
Dr. Amanda Paluch, an associate professor of kinesiology at the University of Massachusetts Amherst, emphasized that adolescence is a critical time for both brain development and mental health. She noted that even small increases in physical activity can lead to significant benefits, advocating for sustainable and enjoyable ways for adolescents to increase their movement, such as walking to school or engaging in play.