Students who exercise almost every day face a significantly lower risk of developing clinically defined depression or anxiety over the following year compared to peers who rarely work out, according to a large prospective study published in the open-access journal PLOS One. Researchers tracking 10,460 full-time students in Norway between the ages of 18 and 35 found that how frequently a student exercises matters more consistently for mental health than the intensity or duration of individual sessions.
Norwegian Study Tracks Ten Thousand Students Over Time
The research, led by Michael Grasdalsmoen of Western Norway University of Applied Sciences alongside colleagues from the University of Bergen and the Norwegian Institute of Public Health, aimed to move beyond single-point snapshots. According to the findings, students completed baseline questionnaires detailing their weekly exercise habits, including frequency, session length, and perceived intensity. One year later, participants completed a self-administered diagnostic instrument built for World Health Organization mental health surveys to assess whether they met clinical criteria for major depression or generalized anxiety disorder.
The data revealed that the probability of developing a common mental disorder declined as total weekly exercise increased, continuing up to approximately 10 hours per week. However, hitting that high mark is not required for protective benefits. The results supported World Health Organization recommendations of at least 150 minutes of moderate-to-vigorous physical activity per week, demonstrating that regular movement fits well into demanding academic schedules.
Exercise Frequency Outweighs Intensity and Duration
When analyzing the metrics, the research team discovered that exercise frequency produced the most consistent association with mental health outcomes. Skipping a workout because a student only has 20 minutes is counterproductive, as short, frequent sessions offer meaningful protection. As Grasdalsmoen explained to Earth.com, students should utilize short time frames for brisk walks, runs, cycling, or skiing. “I would say: use those 20 minutes. Go for a brisk walk, run, cycle, ski if you have the opportunity, or do another activity you enjoy and can easily repeat,” Grasdalsmoen stated.
Did you know? Raw data from the study showed that among women who never or seldom exercised, 59.9% met clinical criteria for a mental disorder at follow-up, compared to 41.6% of daily exercisers. For men, the figures dropped from 45.2% among infrequent exercisers to 23.1% among those who exercised daily.
Gender Differences in Exercise Patterns and Risk Factors
While frequency mattered uniformly across genders, secondary patterns diverged between male and female participants. Among women, lower exercise intensity predicted a higher risk of anxiety and depression, with those who took it easy carrying a 31% higher risk than women who pushed themselves close to exhaustion. For men, intensity showed no reliable link, but session length emerged as a stronger risk factor. Men whose workouts ran under 15 minutes faced a 67% higher risk of common mental disorders than men exercising for longer than an hour each session, according to the adjusted findings.
Because the research was observational, investigators noted it cannot definitively prove that exercise alone prevents mental illness. Unmeasured lifestyle factors and the reality that early symptoms of anxiety or depression can make physical activity difficult both play a role. Even so, the study authors emphasize that supporting students to stay active should form a core component of a healthy learning environment.
Frequently Asked Questions
Does the study prove that exercise prevents depression and anxiety?
No. Because the research is observational, it shows a strong correlation between regular exercise and a lower risk of clinical disorders over time, but it cannot establish direct causation.
How many minutes of exercise per week are recommended based on the findings?
The findings support World Health Organization guidelines of at least 150 minutes of moderate-to-vigorous physical activity per week, spread out across frequent, manageable sessions.
Did the study look at specific types of physical activity?
The questionnaire kept the definition broad, encompassing activities such as walking, skiing, swimming, or participating in organized sports.
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