Physiology of Exercise

This essay hasn't yet been marked by one of our teachers

You can view 1 essay on Biology that have been Marked by Teachers

The first 200 words of this essay...

Design

Problem Statement: The purpose of this lab is to examine heart rate in response to caffeine consumption.

Hypothesis:

* Null hypothesis: There is no correlation between heart rate and caffeine.

* Alternate hypothesis: There is a correlation between heart rate and caffeine.

Hypothesis Explanation: Caffeine acts as a natural stimulant that increases activity, and certainly heart rate. Heart rate is higher in the first 30 minutes because the stimulant will eventually pacify. Caffeine will stimulate the central nervous system by blocking adenosine, a neurotransmitter that normally causes a calming effect in the body. As a result of adrenaline release, heart rate will increase. However, the stimulation of central nervous system can produce fatigue and restlessness1.

Variables:

* Independent: time of heart rate measurement at regular time interval of 15 minutes

* Dependent: cardiovascular rate

* Controlled: amount of caffeine intake

Control of variables: As for controlled variables, I will be controlling the amount of caffeine intake which is 160 mg. Heart rate will be measured every 15 minutes for 60 minutes.

Apparatus and material:

* Volunteer(s) for the experiment, 16 fl. oz. drink with