Investigation: How heart rate changes with exercise?
The aim of this investigation is to find out how different types of exercise (jumping rope, jogging, weights, walking & stretching) affect the heart rate, and compare the heart rate after the exercise to the resting heart rate.
The heart rate after the exercise will be significantly higher than the resting heart rate. The more intense the exercise, the higher the heart rate as well.
When the body is exercising the muscles respire to produce energy, so the muscles can contract. Oxygen is needed for this process; the oxygen is carried in the hemoglobin of the red blood cell. The heart and lungs need to work harder in order to get a greater amount of oxygen to the muscles for respiration. In muscle cellsdigested food substances are oxidized to release energy. These oxidation reactions are called cellular respiration. When muscles use oxygen in order to respire the process is called aerobic respiration:
1.Measure your resting heart rate (heart rate before the exercise). Use the first two fingers of one hand to feel your radial pulse on the opposite wrist (see Figure 1). Do this for 15 seconds (using a stopwatch) and then times the number of beats by 4.