Based on the eperimental descriptions below, please answer questions about the d
ID: 3504981 • Letter: B
Question
Based on the eperimental descriptions below, please answer questions about the design of the experiments.
Experiment 1: Effects of exercise
In the previous lab, you determined the effects of exercising for 3 minutes on a bicycle ergometer for all students in the class to answer the research question: What is the effect of exercise on heart rate and breathing rate in college students, as compared to a resting state?
Experiment 2: Now lets consider a different experiment to answer the same research question
Imagine we have divided the class into two groups. One group started by resting for 3 minutes, then after a 2 minute break, exercised for 3 minutes on a bicycle ergometer. Breathing rate and heart rate were collected after 3 minutes at each condition. The second group started by exercising for 3 minutes on a bicycle ergometer, then after a 2-minute break, rested for 3 minutes. Breathing rate and heart rate for each condition (resting and exercise) were collected after 3 minutes.
Now let's consider a third experiment to answer the same research question.
In this experiment, we have each subject start with a 3-minute rest period, and collect breathing rate and heart rate data. Then each group exercised for 6 minutes on a bicycle ergometer. Breathing rate and heart rate were collected after 3 minutes, and again after 6 minutes.
a. What basic type of study design does this experiment use to answer the research question?
-descriptive
-experimental
-neither
b. More specifically, what type of study design does this experiment use to answer the research question?
-case study
-cross-over
-cross-sectional
-longitudinal
-pre/post
-randomized, controlled
-retrospective
-time series
Explanation / Answer
Effects of exercising on a bicycle agrometer .
The breathing speeds up or increases to get more oxygen into the body and to remove carbon dioxide.
The heart(pulse rate )increases because Heart speeds up to pump extra food and oxygen to the muscles .
During exercise the heart rate and breathing increases .
After exercise the heart rate and breathing comes to normal .
Ia.It is an experimental study
b. Study design is cross sectional and time series. Since the experiment is done in groups at regular intervals of time.
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