• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Physiology of Exercise

Extracts from this document...


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. ...read more.


Calculation of mean and standard deviation of heart rate (Person 6 - 10) Person 6 Person 7 Person 8 Person 9 Person 10 Mean 78.5 90.75 77.25 85 85 STDEV 3.696846 4.112988 5.315073 5.228129 5.560276 Table 5. Calculation of mean and standard deviation of 2 groups as a whole Group N Mean Stdev Std. Error Mean Pre-test3 10 82.6 11.1774 3.5346 Average4 10 84 11.8533 3.7483 Mean of heart rate of Person 1 = Standard Deviation of Person 1 Step 1: calculate the mean = 67.5 Step 2: calculate the deviations Step 3: square the deviations Step 4: calculate the standard deviation T-test Calculation of Person 1 Summary of results: The mean of the pre-test of heart rate turns out to be lower than the mean of the heart rate after caffeine consumption (82.6 < 84)5. The calculated standard deviation of the pre-test of heart rate in comparison to the heart rate after caffeine consumption is from 11.1774 to 11.8533. ...read more.


For example, a younger male athlete with low caffeine tolerance will demonstrates a higher average heart rate than one who has higher caffeine tolerance. * Human errors occur with the lack of knowledge on how to operate the equipments properly. Holding the heart rate grip monitor properly between the experimenters and experimentees is important. * An individual must completely by resting while testing for resting heart rate. Exercising during this operation will result in inconsistency. * Equipment error is an additional limitation of procedures. After my experience with the Heart Rate Grip Monitor, on one occasion, one's heart rate will start properly (i.e. 86 bpm). However, there are times when the result will show to be 0 bpm. When the starting point is at 0 bpm, the average will alter resulting in inaccuracy and inconsistency with other averages. Procedure modification: * Do not exercise or conduct any other activity while getting the resting heart rate. * Read the manuals and know your procedures prior to conducting the experiments. * Categorize individuals into either gender or heart condition (between an athlete and sedentary individuals) to increase reliability. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Research Question: Does the duration of exercise have an increased effect on a persons ...

    Results showed that since t-calculated was -11.06 ( well inside the rejection region) the average Heart Rate for increment one 0 seconds is significantly different than the average Heart Rate for increment two 45 seconds. While these results agree with what was expected to happen, it seems strange that after

  2. To investigate how aerobic exercise affects the heart rate

    as the length of physical activity increases. Processed data Calculations Average = attempt 1 + attempt 2 + attempt 3 + attempt 4 + attempt 5 5 Standard deviation (done using a spreadsheet) Working Length of time to perform jumping jacks (min) �0.5s Pulse rate (bpm) � 1 bpm Calculations and working Average heart rate (bpm)

  1. Bio lab - Oxygen Consumption in germinating and non-germinating seeds

    -0.04 20 0.03 0.05 0.02 -0.005 -0.035 25 -0.05 0.01 0.06 -0.045 0.005 30 -0.08 0.01 0.09 -0.115 -0.035 Processed Table 3: The volume of oxygen consumption in each 1.0 ml pipettes in ice water. The differences are calculated by subtracting final value from the initial value.

  2. Biology Extended Essay 2009

    In term of relative sweetness, fructose is sweeter than sucrose, which is sweeter than glucose.9 Diagram 110: Shows a disaccharide sucrose molecule that is made up of monosaccharide glucose (left) and fructose (right) molecule. 2.2 Pasteurized orange juice Characteristics Pasteurized orange juice is also known as chilled refrigerated juice and commonly labeled as "not from concentrate".

  1. cell theory summary

    This process of cell replication in eukaryotes is called mitosis and in prokaryotes is called binary fission. The parental cell divides to produce identical daughter cells. * This aspect of cell theory suggests that all cells therefore have a common ancestor, the original ancestoral cell form which all other cells have arisen by descent.

  2. Calibration curve

    Now continue adding the potassium to each test tube, after adding the potassium place the rubber stopper onto the test tube and shake well, then record the time when the potassium permanganate solution was added.

  1. Activated sludge wastewater treatment system and method

    or it will simply not be able to cope with a large volume spill such as this. Finally, operating a waste activated sludge system is a relatively complex process with a number of variables; it would be preferable to have a simpler system if possible.

  2. An experiment to determine the effect of caffeine on heart rate

    I can see that there is a different between the results but it?s not very significant. Limitations that were faced during this experiment included the measurement of the heart beat. In some cases, my friend/family member was unable to find my pulse when the time had come to record my heart rate.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work