Description

Specific Aims:

Specific Aim 1: Determine the independent and convergent effects of breakfast and exercise on child classroom behavior using systematic classroom observations.

Hypothesis 1: Groups assigned to receive protein-rich breakfast (1 & 3) will demonstrate greater engagement and reduced off-task behavior compared with those receiving high carb breakfast (groups 2 & 4) (the main effect of high-protein breakfast). Groups receiving morning exercise (2 & 3) will demonstrate great engagement and reduced off-task behavior compared with groups not receiving exercise (1 & 4) (main effect of exercise). Children receiving both exercise and breakfast (group 3), will demonstrate greater improvements than those receiving just one (1 vs. 3 & 2 vs. 3), the interaction effect.

Specific Aim 2: Determine the independent and convergent effects of breakfast and physical activity on inhibitory control and attention using computerized executive function tasks.

Hypothesis 2: It is hypothesized that our data will show a main effect of protein rich breakfast on neuropsychological task performance (groups 1 & 3 vs. groups 2 & 4), a main effect of morning exercise (2 & 3 vs. 1 & 4), and an interaction effect favoring the combination of breakfast and exercise beyond either in isolation (3 vs. 1, 3 vs. 2).

Specific Aim 3: Explore potential changes in brain activity by assessing blood flow via functional near-infrared spectroscopy (fNIRS) in the prefrontal cortex, while completing the computerized cognitive tasks.

Hypothesis 3: Results are expected to evidence similar patterns as aims 1 and 2, such that blood flow in the prefrontal cortex, will increase more in groups receiving both, relative to those receiving just one, and those receiving neither. Relationships between cerebral blood flow, task performance, and classroom behavior will be assessed.

Background

Strong experimental and observational evidence supports connections between nutrition, physical activity, and neurocognitive development. In fact, one of the first interventions to show that exercise improves cognitive abilities in elementary-aged children was conducted at the University of Illinois Urbana Champaign, and several subsequent studies have replicated these results. Many studies assessing diet quality indicate a clear link between diet quality and cognition in children. While these outcomes are important for researchers, their perceived importance to parents and teachers lies in their promise to influence academic outcomes. For example, exercise improves cognitive inhibition on lab-based tasks, but teachers want to see that the benefit generalizes to raising their hands before speaking. Here, there is surprisingly little data, limiting adoption of interventions.

Another consideration regarding health behaviors is socioeconomic status, as individuals from low income neighborhoods as well as racial/ethnic minorities have shown to have poorer dietary patterns, lower rates of physical activity, and higher rates of obesity, making children in these groups particularly vulnerable to falling behind in academic achievement and cognitive development. Thus, interventions to improve such health behaviors ought to target children representing these populations as they likely have the most gain from healthy lifestyle changes.

Finally, interventions conducted in schools are particularly advantageous as children spend most of their day in schools not only during instruction but also before and after school as childcare while parents are working. Lastly, while many observational and experimental studies show clear diet-cognition and exercise-cognition interactions, these are almost always studied in isolation without examining combined effects. Which is most important? How much benefit does the combination of diet and exercise provide above and beyond either in isolation?

The outcomes of interest include children's classroom behavior, specifically time spent on and off task, behavioral cognitive skills such as accuracy and reaction time on computerized tasks assessing attention and inhibitory control, and blood flow to specific areas of the brain associated with attention and classroom behavior. This pilot study will implement a 1-week (Monday-Friday) school-based intervention using a 2 x 2 factorial design with 2 factors, morning exercise (yes/no) and breakfast (protein rich/carb rich) and 2 levels of each factor (yes or no). Children will be randomized into one of four intervention groups, 1) protein rich breakfast only, 2) exercise and carb rich breakfast, 3) both protein rich breakfast and exercise, and 4) carb rich breakfast only. Monday, Wednesday, and Friday of that week, children's classroom behavior will be monitored via a recording on a camera placed in their classroom. Friday afternoon children's cognitive function and brain blood flow will be assessed. Randomization will be conducted post baseline by a study co-investigator, Dr. Naiman Kahn using a block randomization scheme which will be applied during each wave. Waves will be in sizes that are divisible by four. Data collectors will be blind to condition. Interventions will not collect data.

The current study is a school based intervention. Children will be monitored for one week prior to intervention implementation in order to provide baseline assessments of classroom behavior, cognition, and brain blood flow. The intervention will be implemented the following week and post testing will occur during the same week on Monday, Wednesday, and Friday. Following completion of the study, all participants will be offered five days of breakfast and five days of morning exercise regardless of group assignment.

The following procedure will be followed:

Parent's will complete a demographics survey after consent to confirm the participants, age, biological sex, date of birth, race/ethnicity, household income/educational status, and any diagnosis of neuropsychological disorders such as autism spectrum disorder or Attention-Deficit Hyperactivity/Impulsivity Disorder (ADHD).

Baseline Testing: For one week prior to the intervention, children's classroom behavior will be observed three times during the week (Monday-Friday) using the Behavioral Observation of Students in Schools (BOSS) systematic observation tool. Further, baseline brain function via Functional Near Infrared Spectroscopy (fNIRS) and cognitive testing via performance on computerized tasks will be assessed at the end of the week on Friday along with height and weight.

Aerobic fitness will be assessed via a shuttle run. This test allows for a group assessment of aerobic fitness by instructing children to run in sync with a series of beeps for 20 meters. The frequency of the beeps gradually increases, requiring participants to run faster each round. Once a child cannot keep up with the pace, the test is completed. This assessment will only be completed once at baseline.

During morning physical activity sessions hart rate will be recorded using the first beat heart rate system, which includes chest straps. For the entire baseline week, children will be asked to wear an accelerometer on their hip to assess their physical activity level throughout the day. Children's height and weight will be assessed once at baseline using a scale and stadiometer.