The Acute Effects of a "Reduced Sitting Preschool Day" on Executive Function and Musculoskeletal Health in Preschoolers: A Randomized Cross-Over Study

Associations between sedentary types, sedentary patterns and cognitive ability in preschool children

The preschool years are a critical period for developing cognitive abilities such as reasoning, memorization, comprehension, quick thinking, and problem-solving. Sedentary behavior (SB) is known to be associated with cognitive development in preschool children. However, limited research has focused on how different types of SB (active, passive) and sedentary patterns (bouts, breaks) affect preschool children's cognitive abilities. This cross-sectional study aimed to investigate: (1) the relationship between sedentary types and preschoolers' cognitive abilities; and (2) the relationship between sedentary patterns and preschoolers' cognitive abilities. Preschoolers aged 3 to 6 years (n = 353) were recruited from 5 kindergartens in Changsha, Hunan, China. Sedentary types were reported by parents, sedentary patterns were measured by preschoolers wearing an ActiGraph wGT3X-BT for seven consecutive days, and cognitive abilities were assessed using the Wechsler Preschool and Primary Scale of Intelligence (WPPSI-IV). The relationships between variables were analyzed using multiple linear regression models. Non-screen-based active SB was associated with higher full-scale IQ and fluid reasoning index in boys and higher visual spatial index in girls. Screen-based active SB was negatively associated with overall cognitive ability. Passive SB potentially had a negative effect on overall cognitive ability, but screen-based passive SB was positively associated with higher fluid reasoning indices in girls. Preschoolers' cognitive ability was positively associated with sedentary breaks, but not with sedentary bouts.

CONCLUSIONS

Not all types of SB are equal when examining optimal cognitive development in preschoolers. Frequent breaks from sedentary time were associated with better cognitive development. Encouraging more frequent breaks to interrupt prolonged SB may be a viable strategy for reducing sedentary time to promote optimal cognitive development. These findings should be further validated in larger prospective studies.

WHAT IS KNOWN

• Sedentary behavior is not advantageous for cognitive development.

WHAT IS NEW

• Not all types of sedentary behavior are harmful. • Active sedentary behaviors are beneficial to overall cognitive development, but screen-based active sedentary behaviors may negatively impact some areas of cognitive performance. • Cognitive abilities in preschoolers are associated with sedentary breaks, but not with sedentary bouts.

Are there associations between sedentary time inside and outside preschools with preschoolers' executive function?

Preschool children spend a large part of their day at school, and a large part of that time they spend in sedentary time. Although sedentary time negatively affects regions of the brain responsible for cognition, it is believed that the type of sedentary time performed can favor executive functions' performance. The present study explored the associations between sedentary time inside and outside preschools with executive function (EF) tasks in preschoolers. Seventy-three preschool children (60% girls; 55.0 ± 9.1 months of age) were objectively assessed for sedentary time and physical activity (PA) using accelerometers (wGT3X). EF was evaluated using the Go/No-Go paradigm through the Early Years Toolbox - YET. Go's inverse efficiency (IE) and the No-Go accuracy were analyzed. To establish possible associations between EF and sedentary time, a structural equation model was conducted after adjustments for sex, age, body mass index, and moderate-to-vigorous PA. A significant and positive association between sedentary time on weekend days and IE (b = 0.61; p < .001) was observed. The general model explained 52% of the variation in IE and 2.1% in the accuracy of No-Go. The sedentary time on weekend days seems to be related to worse EI. This result emphasizes a context-dependent association between time being sedentary and preschoolers' EF. Further investigations should focus on exploring the type of sedentary behavior children are engaged in different contexts.

Do acute and chronic physical activity interventions affect the cognitive function of preschool children? A meta-analysis

This meta-analysis aims to investigate the effects of acute and chronic physical activity (PA) interventions on multiple domains of cognitive function (CF) in preschool children. Electronic databases (PsycINFO, PubMed, SPORTDiscus, Embase, Web of Science, MEDLINE, and ERIC) were searched for relevant studies between January 2000 and February 2022. Studies that examined the effects of acute or chronic physical activity interventions on CF in preschool children aged 2-6 years were included. A total of 16 articles were eligible for this meta-analysis. Results showed that there was no effect of acute PA interventions on CF (Hedges' g = 0.04; 95% CI = -0.12, 0.19). Chronic PA interventions had a moderate and positive effect on overall CF (Hedges' g = 0.49; 95% CI = 0.29, 0.69), a large effect on perception (Hedges' g = 1.19; 95% CI = 0.64, 1.75), and a moderate effect on inhibitory control (Hedges' g = 0.73; 95% CI = 0.22, 1.24). The moderator analyses showed that overall CF performance was significantly moderated by intervention modality and assessment of cognitive outcomes, and no other moderator (study design, sample size, frequency, duration, and session length) was found to have an effect. Chronic PA intervention might be a promising way to promote multiple aspects of CF, especially executive function and perception. Future studies should explore the effect of different intensities of PA on the CF of preschool children to discern the most effective PA prescription to, in turn, enhance the CF of preschool children.