Table 1.

Eligibility Criteria Based on PICOS.

PICOS	Inclusion Criteria	Exclusion Criteria
Population	Healthy older adults (mean age, ≥60 years) without restrictions based on sex or fitness level.	Children, adolescents, or middle-aged adults. Individuals with a medical condition that may limit their participation in sport-based activities, meaning that they must not have any neurological pathology, psychiatric disorder, or other types of medical conditions. Participants of paralympic sports or individuals with disabilities are not included.
Intervention	Chronic intervention programs (with a minimum duration of 4 weeks) based on a sport, of a competitive or recreational type. The interventions should involve sport exercises (e.g., soccer) or sport-based or sport-adapted exercises (e.g., walking soccer).	Acute interventions. Chronic sport-based interventions combined with different types of exercises (for example, aerobics or resistance training) or with the aid of a nutritional supplement. Chronic interventions that are not related to a sport.
Comparator	Group not exposed to the sports training program. The control group may be active (alternative training method, such as balance or stretching program) or passive (continuing their usual activities of daily living).	Absence of control group.
Outcome	Pre-post-intervention values for one or more direct assessment measures for the executive functions of working memory, inhibition, or cognitive flexibility.	Indirect measures of executive functions (e.g., questionnaire). Measures of executive functions other than working memory, inhibition, or cognitive flexibility.
Study design	Longitudinal studies with at least one experimental group and a control group, that include pre- and post-intervention measurements.	Cross-sectional studies; Single-group interventions.