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Cognitive function refers to the mental process of knowing or thinking. It involves all aspects of mental processes that enable individuals to perceive, recognize, process, and understand thoughts. Specifically, cognitive function involves processes such as action, attention, memory, learning, reasoning, planning, problem solving, decision making, and communication. These cognitive functions are not only important to daily life but are also recognized as main components in health-related quality of life.

Cognition: A Lifespan Spectrum

Although the major brain areas that are the core resource of cognition are set at birth, along with emerging and forming networks of brain cells, cognition and intelligence continuously develop throughout childhood, adolescence, and into young adulthood, thereafter declining gradually after adulthood. For example, with the exception of vocabulary, multiple cognitive functions, including the speed of information processing, reasoning, and memory, peak at 20 years of age and then decline linearly until the age of 70 years. Generally, compared to the entire population, an individual's cognitive function at 20 years is above the 75th percentile, at 50 years it is near the 50th percentile, and at 70 years, it is in approximately the 20th percentile. This decline of cognitive function is linked to cognitive impairment in later life, such as dementia and Alzheimer's disease.

As one can easily notice, the rate of cognitive development during early life and cognitive decline later in life exhibit marked interindividual variability. Environmental factors and an individual's experiences, including physical activity, intellectual engagement, social interaction, nutrition, and self-confidence, can positively influence these cognitive changes. Participation in physical activity is particularly emphasized in both lifespan phases by numerous social and health institutions and organizations, because increased physical activity has been related to multiple benefits affecting physical and mental health in children and older adults.

Physical Activity and Cognition: Different Perspectives

Early and Large-Scale Observational Studies

Physical activity and cognition were first investigated by Waneen Spirduso, Karen Francis, and Priscilla MacRae in the 1970s. While the researchers found that older adults demonstrated a longer reaction time of information processing in response to several cognitive tasks compared with younger adults, they also found that both older and younger adults showed differences based on participation in sports. The older adults who participated in sports regularly not only had a greatly increased cognitive speed compared to older sedentary adults, but also had similar cognitive performances as young sedentary adults, suggesting that participation in sports positively moderated the age-related cognitive decline.

The positive associations between physical activity and cognitive performance have also been shown in large-scale epidemiological studies. Generally, studies of older adults based on retrospective reports of physical activity have suggested protective effects against cognitive decline and cognitive impairment. However, these subjective measurements of physical activity are somewhat imprecise, and information regarding the modality, intensity, frequency, duration, and length of participation in physical activity is often deficient.

A study focusing on physical fitness, rather than physical activity, which involved approximately 900,000 California schoolchildren, demonstrated that increased physical fitness was significantly positively associated with enhanced reading and mathematics scores, regardless of gender and grade. Although a cause–effect relationship cannot be established from observational studies, the positive correlation between physical activity and cognition is promising.

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