Physical Fitness and Mental Health Outcomes

Physical fitness encompasses multiple dimensions of physiological function, including cardiorespiratory endurance, muscular strength and flexibility. A growing body of evidence indicates that higher levels of physical fitness are consistently associated with better mental health outcomes across the lifespan. Cardiorespiratory fitness appears to buffer against symptoms of depression and anxiety through mechanisms such as enhanced neuroplasticity, regulation of the hypothalamic–pituitary–adrenal axis and reductions in systemic inflammation. Muscular fitness contributes to self-efficacy, body image and resilience to stress, while habitual physical activity supports social engagement and the release of endorphins. Dose–response relationships have been observed, whereby incremental improvements in fitness confer proportional reductions in risk of common mental disorders. These associations hold true across diverse populations, from school-aged children to older adults, and underscore the importance of tailored exercise prescriptions as a low-cost, non-pharmacological strategy to promote psychological well-being and quality of life on a global scale.

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Physical Fitness and Mental Health Outcomes publication trend

The graph below shows the total number of articles in physical fitness and mental health outcomes across all publications each year (not limited to Nature Index journals).

Technical terms

Cardiorespiratory fitness (CRF): The ability of the circulatory and respiratory systems to supply oxygen during sustained physical activity, often estimated by maximal oxygen uptake (VO2max) or peak oxygen consumption (VO2peak).

VO2peak: The highest rate at which oxygen can be taken up and utilised by the body during intense exercise, expressed in millilitres per kilogramme per minute (ml·kg⁻¹·min⁻¹).

Metabolic equivalent of task (MET): A unit used to estimate the energy cost of physical activities; 1 MET represents the energy expended at rest, with higher values indicating greater intensity.

Internalising symptoms: Psychological experiences directed inwardly, such as sadness, anxiety and social withdrawal.

Self-efficacy: An individual’s belief in their capacity to execute behaviours necessary to achieve specific performance attainments, influencing motivation and resilience.

References

1. Remote Exercise Training Intervention During the COVID-19 Pandemic: Randomized Controlled Trial. Journal of Medical Internet Research (2024).
2. Physical and mental health in adolescence: novel insights from a transdiagnostic examination of FitBit data in the ABCD study. Translational Psychiatry (2024).
3. Cardiorespiratory fitness and incident use of anxiolytics and antidepressants in adults. A linkage study between HUNT and the Norwegian Prescription Database. Journal of Affective Disorders (2023).