Research from the University of Tasmania's Menzies Institute for Medical Research, in partnership with Adelaide University, suggests that children with better cardiorespiratory fitness are less likely to experience depression in adulthood. The findings, published in the Journal of Affective Disorders, draw on data from the Childhood Determinants of Adult Health study, which spans over 30 years.
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Dr. Brooklyn Fraser of the Menzies Institute noted that the study found a strong relationship between childhood fitness and the risk of developing depression later in life. "The data collected over 30 years have given us a rare opportunity to examine how early-life fitness relates to mental health later in life," Fraser stated. The research specifically highlighted that those with better cardiorespiratory fitness, which includes activities that lead to noticeable exertion, demonstrated a lower risk for adult depression.
The study evaluated the cardio and muscular fitness of Australian children aged 7–15 in 1985 and reassessed them between the ages of 36 and 49. Findings indicated that this relationship was especially pronounced in females.
Dr. Kylie Smith, another researcher at the Menzies Institute, emphasized the complexities of depression, stating that while fitness may not be the sole factor influencing risk, it is a significant piece of a larger puzzle. She noted, "While we cannot say a lack of fitness during childhood causes depression in adults, the findings suggest that childhood fitness may have benefits beyond physical health."
The analysis included more than 1,000 participants. Childhood fitness was measured through physical tests such as a 1.6-kilometer (1-mile) run for cardiorespiratory fitness and a standing long jump for muscular power. A subgroup also participated in cycling and handgrip strength tests. Over three decades later, participants underwent a World Health Organization diagnostic interview to assess their lifetime experiences with depression.
Adelaide University researcher Grant Tomkinson highlighted the need for further investigation into modifiable factors that could lower depression risk. He remarked, "Being physically active is beneficial for mental health, and while previous research indicates fitter adults are less likely to develop depression, we know relatively little about the impact of fitness in childhood on mental health years later. The good news is that fitness is something we can change, making it a potential target for enhancing long-term mental well-being."