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Biology heart rate Planning

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Biology Lab Report by Abdullah Shaikh Factors affecting the Physiological condition of the body (C2, C3, C4) Aim: to investigate the effect of temperature on heart rate of an individual during endurance exercise Introduction: Heart rate is the number of heartbeats per unit of time. It is usually measured in beats per minute (bpm). The human heart is a muscular organ responsible for pumping blood into the blood vessels of the body by repeated rhythmic contractions. This is how typically the human heart functions. The right side of the heart is responsible for carrying deoxygenated blood used by the body. Deoxygenated blood is collected in the right atrium and through the right ventricle it is pumped into the lungs where gaseous exchange occurs. Blood absorbs oxygen from the alveoli and Carbon dioxide is given out of the body. This oxygenated blood is pumped by the left ventricle to the different parts of the body through the aorta. The oxygen is absorbed by body cells to produce energy by respiration, which is needed for metabolism. ...read more.


Physical fitness and stamina of an individual is important in determining his heart rate. A person who exercises regularly has a lower heart rate than an unfit person. After exercise the heart rate of the trained person comes back to normal faster Hypothesis: As the environmental temperature increases the heart rate too increases. As the outside temperature increases the core body temperature too increases. Due to this metabolism occurs at a faster rate in body cells, which causes the heart rate to increase. However, during extreme cold conditions the heart rate too increases. In cold conditions we start shivering and our core temperature increases. Due to uncontrollable muscular activity the energy requirement to maintain the core temperature increases and so the heart rate too rises. Independent variable: the ambient temperature during exercise Dependant variable: the heart rate after exercise, time taken for the heart rate to return to normal Controlled variables: altitude, humidity, distance to be covered while sprinting, time taken for the sprint, VO2 max, physical fitness and stamina of the individual, energy consumption before sprint Fair test: I will control my variables in the way. ...read more.


I will take results at 16?C, 25?C and 35?C. For 35?C on a hot afternoon I will turn off the air conditioner and put on the night lamps, which have a heating effect. Apparatus; 1. Device to cool the room, air conditioner 2. Jogging track 3. Stethoscope 4. Stopwatch ? 0.1 sec Method: 1. Make the temperature of the room 16?C by adjusting the air conditioner 2. Record your normal heart rate either by feeling your pulse or using a stethoscope. 3. On the jogging track mark a distance of 200m to be covered 4. Carry a stopwatch while running and try to estimate and time your run in approximately 30 seconds. 5. After the distance is covered tell someone to help you measure your heart rate either by feeling your pulse or using a stethoscope. 6. Note down the heart rate immediately after the sprint is over 7. Keep measuring the heart rate at regular intervals and note down the time taken for the heart rate to return to normal 8. Carry out steps 2 to 7 with controlled temperatures of 25?C and 35?C ...read more.

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A good start, however your experiment is not very clear on what you are measuring. Is it the maximum heart rate during exercise at different temperatures or heart rate after exercise at varying temperatures or recovery time after exercise at varying temperatures?

The theory side is okay but you missed the key point linking exercise and heart rate together; it is the need for a higher rate of respiration to deliver the heightened demand for energy of the muscles.

Marked by teacher Jon Borrell 08/01/2013

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