University of Oulu study on exercise and mental health

University of Oulu researchers said on June 1 that moderate-to-vigorous physical activity was more strongly linked to better mental health in middle age than light activity such as easy walking. The study, conducted with the ODL Department of Sports and Exercise Medicine, also found that sufficient sleep was associated with fewer symptoms of depression and anxiety. The paper was published in the journal *Depression and Anxiety* and drew on data from middle-aged adults in Finland. The Finnish team said the findings came from a 24-hour movement analysis rather than from exercise alone. Researchers examined how sleep, sedentary behavior, light activity and moderate-to-vigorous physical activity fit together across a full day, and how those patterns related to depressive and anxiety symptoms. The study population included 4,490 participants from the Northern Finland Birth Cohort 1966, according to the paper’s abstract. (oulu.fi) ### What did the researchers actually find when they compared exercise intensities? The University of Oulu said people who spent more of their day in moderate-to-vigorous physical activity, relative to sedentary behavior and light activity, reported fewer symptoms of depression and anxiety. The university said replacing sedentary behavior with light activity produced smaller and more limited benefits than replacing it with moderate-to-vigorous activity. (oulu.fi) Maisa Niemelä, an adjunct professor at the University of Oulu, said the findings suggested that “the intensity of physical activity is key, not merely increasing movement as such.” The university defined moderate-to-vigorous activity as exercise intense enough to leave a person slightly out of breath. ### How large were the changes linked to a shift in daily routine? (oulu.fi) A 30-minute change was one of the study’s clearest benchmarks. The University of Oulu said that when 30 minutes of sedentary time was replaced with moderate-to-vigorous physical activity, depressive symptoms were 9% lower and anxiety symptoms were about 5% lower. Niemelä said the results did not depend on major lifestyle overhauls. “Even a 30-minute daily adjustment can be meaningful,” she said, according to the university’s summary of the study. (oulu.fi) ### Where does sleep fit into the same picture? Sleep was the other consistent factor in the findings. The University of Oulu said sufficient sleep, alongside moderate-to-vigorous physical activity, was associated with fewer symptoms of depression and anxiety. (oulu.fi) Participants reported sleeping an average of 7 hours and 30 minutes a night. The university said sleeping 5 to 30 minutes less per night was associated with a slight increase in symptoms. (oulu.fi) Clarence Tan, a doctoral researcher at the University of Oulu, said “getting enough sleep and increasing moderate-to-vigorous physical activity is an ideal lifestyle change for supporting mental health in middle age.” ### Who was studied, and how was the research set up? (oulu.fi) The paper’s abstract said the study used a population-based sample of middle-aged adults from the Northern Finland Birth Cohort 1966. That cohort has followed people born in northern Finland in 1965 and 1966 over decades and has been used in other University of Oulu midlife health research. The abstract said the study investigated the “compositional associations” of 24-hour movement behaviors with depressive and anxiety symptoms. (oulu.fi) That means the researchers treated time spent sleeping, sitting, moving lightly and moving at higher intensity as parts of the same fixed 24-hour day. ### What comes next for readers who want the primary source? The study is published in *Depression and Anxiety* under the title “Compositional Associations of 24-h Movement Behaviors With Depressive and Anxiety Symptoms.” The University of Oulu published its summary on June 1, and the paper’s PubMed record identifies the Northern Finland Birth Cohort 1966 sample and the Oulu-linked research team. (pubmed.ncbi.nlm.nih.gov)