• 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. Biology Extended Essay 2009

    4.2 Thermal processing During the pasteurization process, orange juice is needed to go through the thermal processing where it is heated up to 70 C in order to inactivate enzymes that encourage microbial spoilage. On the other hand, some vitamins are volatile and loss of nutrients can occur during the

  2. The effect of pvc piping on the breathing/heart rates of male year 12 students

    If the lengths of the pipe were further increased the subject would most likely experience and increase in heart rate and breathing rates that coincide to an exponential gradient. This could continue until either the subject could not generate sufficient pressure the draw air from the end of the pipe

  1. To investigate how aerobic exercise affects the heart rate

    Slide left arm through the cuff and position the cuff about 0.5 inches above the elbow. 3. Position the green marker directly over the artery on the inside of the arm 4. Secure the cuff 5. Place arm on a table so that the cuff is at the same level as heart 6.

  2. Biology Heart Rate Lab. What are the effects of decreasing the amount of ...

    Trial 4 of heart rate measured for a duration of 3 minutes after different amounts of water consumption. Amount of Water Consumed (mL � 10mL) Number of Heart Beats (beats � 2 beats) 100 246 500 234 1000 225 1500 225 2000 204 Table 5.

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

    Temperature (�C�1�C) Time (min) Control (Beads) ml�0.01ml Germinating Seeds ml�0.01ml Non-germinating Seeds ml�0.01ml 21 0 0.925 0.805 0.91 5 0.89 0.71 0.89 10 0.865 0.36 0.875 15 0.84 0.25 0.855 20 0.83 0.22 0.84 25 0.815 0.19 0.83 30 0.79 0.15 0.815 Raw Data Table 8: The volume of the water level

  2. How the Heart Works

    Next the two ventricles contract, once again simultaneously, pumping blood out of the heart through the semilunar valves. The heart then relaxes (diastole) allowing it to once more fills up with blood. When you listen to the heart through a stethoscope you are likely to hear the heart, "lub-dub, lub-dub".

  1. How does the distribution of Plantago maior differ?

    11 3 33 12 3 20 13 4 24 14 2 18 15 4 18 6, far from the street 0 0 0 7, by the street 1 9 40 2 8 18 3 8 16 4 4 20 5 3 20 6 5 12 7 3 30 8 5

  2. Sleep is a normal part of human life. Investigate the neurobiological basis of normal ...

    Sleep until sunlight: if possible, wake up with the sun, or use very bright lights in the morning-sunlight helps the body?s internal biological clock reset itself each day; and there is a recommendation of 1 hour of exposure to morning sunlight 14.

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