91Ó°ÊÓ

Running and Sleep. Sufficient sleep is important for adolescents for both their neural and psychological development. Despite this, daytime sleepiness and poor physical and psychological functioning related to chronic sleep disturbances are common. A growing body of evidence suggests that exercise is associated with both better sleep and improved psychological functioning. Sixty participants were recruited from a high school in northwestern Switzerland. They were randomly assigned to either a running group or a control group, 30 to each group. The running group ran every morning for a little over 30 minutes on weekdays for a threeweek period. All participants used a sleep log for subjective evaluation of sleep, and sleep was also objectively assessed at the beginning and end of the study using a sleep electroencephalographic device that measured quantities such as sleep efficiency and time spent in the four different sleep phases. Running was found to positively impact both objective and subjective measures of sleep functioning.25 a. What are the explanatory variable(s) and the response variable(s)? b. Outline the design of the experiment. c. Here are some more details on the treatment and control groups. All participants arrived at school at 7 A.M., and the running group did two laps on the track and then ran cross country in groups of least four people for 30 minutes. The control group remained seated at the track, worked on homework, and interacted with each other. When the runners returned, all participants prepared for school and ate a breakfast that was provided. Why do you think the experimenters had the control group arrive at \(7 \mathrm{~A}\).M., interact with classmates, and have breakfast together? Explain. Do you think having the control group do these activities is important for the types of conclusions that can be reached? How? d. Time to sleep onset was measured before the beginning of the study and again at the end of the study for participants in both groups. Can this be considered a randomized controlled experiment with time to sleep onset as the response and four treatments (runners before, runners after, controls before, and controls after)? Explain why or why not.

Step by step solution

01

Identify Explanatory and Response Variables

The explanatory variable in this experiment is the activity of running, which only the running group participated in. The response variables are the measures of sleep functioning, which include both subjective assessments from the sleep logs and objective measurements from the sleep electroencephalographic device.

02

Outline the Experiment Design

The experiment involved random assignment of 60 high school participants into two groups: a running group and a control group, with 30 individuals in each. The running group ran every weekday morning for over 30 minutes for three weeks, while the control group participated in sedentary activities. Sleep was evaluated before and after the study both subjectively through logs and objectively via a sleep device.

03

Importance of Control Group Activities

The control group arriving at the same time and interacting helps control for variables such as social interaction and environmental factors that could impact the sleep measures. This setup helps ensure that any differences observed can more confidently be attributed to the running activity rather than other variables, enhancing the reliability of causal inferences.

04

Evaluate the Experiment Type

While the study has elements of a randomized controlled experiment, the comparison of sleep onset time as 'before' and 'after' in each group may not establish the four treatments as separate randomized groups. Instead, the study primarily compares two conditions (running and non-running) and observes the change over time in each, which is more akin to a pretest-posttest design within a randomized controlled framework.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Explanatory and Response Variables

In any scientific experiment, it is crucial to identify the explanatory and response variables. These are the core components that help us understand what is being tested and what the results mean. The explanatory variable, also referred to as the independent variable, is what the researchers change or control to observe its effect. In the context of the adolescent sleep study, the explanatory variable is the exercise regimen, specifically, the running activity undertaken by the experimental group. On the other hand, the response variables are the outcomes that are measured to see if the explanatory variable had any impact. Here, the response variables include the various measures of sleep, both subjective (like sleep diaries) and objective (using electroencephalographic devices to measure sleep phases). Defining these variables clearly helps in correlating the cause (exercise) with the effect (changes in sleep quality). Understanding these terms is essential for interpreting the results adequately.

Sleep Improvement through Exercise

Exercise is widely known to benefit many aspects of health, including sleep. In the running and sleep experiment, researchers wanted to explore the potential improvements in sleep quality resulting from an exercise routine. They engaged adolescents in a structured running activity to see if their sleep patterns would change. Regular physical activity can lead to better sleep because it reduces stress and anxiety, increases deep sleep, and helps regulate the sleep-wake cycle. The study found that participants who ran regularly showed improvements in both subjective and objective sleep parameters. This suggests that incorporating regular exercise, such as running, could be a practical approach for adolescents facing sleep issues. The results of this study could potentially be used to advocate for more school programs that include physical activities, aiming to improve students' overall wellbeing.

Pretest-Posttest Design

The pretest-posttest design is a common methodological approach used in research to evaluate the effects of an intervention. Within this framework, researchers measure the response variables before and after the intervention to see if there is a significant change. In the context of our adolescent sleep study, participants' sleep quality was assessed before the running program started and again after it finished. This design helps in determining whether the observed changes can be attributed directly to the exercise. Although the experiment incorporated random assignment, its primary purpose was to assess the improvement from baseline (pretest) to follow-up (posttest) within each group. It's important to differentiate that while randomized controlled trials primarily compare different conditions or groups, a pretest-posttest design focuses on changes within the groups over time.

Adolescent Sleep Study

This study focused on adolescents because this group faces unique sleep challenges due to developmental changes and environmental factors like school schedules. Adolescents require adequate sleep for their cognitive and psychological development. However, many struggle with sleep disturbances and daytime sleepiness. Conducting this research in a high school setting allowed scientists to examine the practical implications of regular exercise on sleep at this critical stage of life. By including both subjective evaluations via sleep logs and objective measurements using advanced sleep-monitoring technology, the study provided a comprehensive look into how exercise influences sleep among teenagers. The findings are relevant for educators and policymakers, offering evidence that school-based exercise programs could play a crucial role in enhancing students' sleep quality and, by extension, their academic and social functioning.