Science / The Human Heart Rate

The Human Heart Rate

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Autor:  anton  10 September 2010
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Words: 629   |   Pages: 3
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The Human Heart Rate

Aim: To study changes in the rate of the human heartbeat.

Introduction: Blood is sent pulsing through the body’s veins, arteries and capillaries with each beat of the heart. The circulation of blood through the body delivers oxygen and food to the cells and removes wastes. The cells cannot survive if circulation stops for even a small amount of time. With an increase in body movement there is an increase in the cell’s energy use and the heart rate must increase to pump enough blood to the cells. Then, as body movement decreases again, so does the heart rate. The heart muscle can be enlarged with regular vigorous exercise. A larger heart is more efficient than a smaller heart as it is stronger and can hold more blood. The heart is a cardiac muscle and contracts by itself, even when removed from the body. The muscles rhythmic beat is sped up or slowed down by the autonomic nerves that are attached to the heart. The heartbeat has two phases. Systole is the name given to the contraction phase and diastole is the name given to the relaxation phase. The heart valves slapping closed provides the sound of the heartbeat.

Materials

· Stopwatch

Procedure – Part A

1. The group sat quietly and relaxed for two minutes.

2. The stopwatch was used to time 30 seconds while the pulse of the members was taken. The pulses were then multiplied by two.

Part B

1. The group walked around the building for three minutes.

2. Step 2 of Part A was repeated.

Part C

1. The group took part in various forms of vigorous exercise including running, step-ups, running up the stairs and star jumps for three minutes.

2. Step 2 of Part A was repeated.

Results

Resting

Box Rate Box Rate

1 74 15 76

2 54 16 56

3 78 17 82

4 70 18 90

5 50 19 108

6 78 20 60

7 84 21 70

8 66 22 76

9 78 23 84

10 78 24 66

11 50 25 80

12 62 26 80

13 74 27 66

14 74 28 76

Mild Exercise

Box Rate Box Rate

1 94 15 110

2 84 16 78

3 98 17 100

4 90 18 98

5 72 19 102

6 84 20 76

7 76 21 86

8 88 22 94

9 94 23 106

10 102 24 72

11 84 25 92

12 90 26 102

13 88 27 68

14 94 28 86

Vigorous Exercise

Box Rate Box Rate

1 150 15 134

2 128 16 132

3 160 17 160

4 120 18 152

5 102 19 154

6 148 20 132

7 124 21 150

8 146 22 148

9 142 23 150

10 24 98

11 140 25 154

12 128 26 160

13 114 27 148

14 138 28 152

· Individuals involved in regular exercise.

Analysis of Results

1. (84 – 54) X 100 = 55.5

54

2. (128 – 54) X 100 = 173.037

54

3. 80 X 54 = 4320 mL per minute

4320 X 60 = 259200 mL per hour

4. 80 X 128 = 10240 mL per minute

10240 X 60 = 614400 mL per hour

See attached graph.

Discussion

1. The individuals who exercise regularly tend to be concentrated in the low area of the histograms.

2. The individuals who exercise regularly will have a stronger heart and therefore a slower heart rate as it takes less to pump the blood around the body.

3. The range is the greatest in the vigorous exercise section of the graph.

Critical Analysis

The prac overall was successful but a few things could have been improved. The pulse was taken only once at each state. If the pulse had been taken three times and an average found it would have been more accurate. Also, the prac was rushed. When individuals found it hard to find their pulse it made them flustered and feel they were holding the class up. This may have raised their heart rate giving an incorrect resting heart rate. If there were more time to do this prac this would not have been a problem. The readings taken for the mild and vigorous exercise states could have been more accurate as well. If all of the individuals had walked at the same rate and done the same vigorous exercise at the same rate the reading would have been more accurate. These are only a few minor flaws in the prac. It was overall a good prac and very successful.

Conclusion

The prac was successful in studying the changes in the human heart rate. With many different subjects and levels of fitness in those subjects it gave a wide range of results to study. The differences in heart size and strength were evident and useful data has been recorded.



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