How do we find the quantitative effects of changing the duration of light physical exercise ?

Expert Answers
megamind-616 eNotes educator| Certified Educator

By performing and comparing data gathered by the below tests before and after one increases his/her amount of physical activity, the effects of the exercises can be quantitatively measured. 

Cardiorespiratory fitness can be measured by a maximal treadmill test (MTT). A maximal treadmill test induces the patient's heart rate to 80-90% of the maximal rate that is given per gender and age group. It tests how hard the heart has to work during physical activity and helps to find the limits of the cardiovascular system. As one begins to increase physical activity, he/she should be able to do more activity with less stress to the cardiovascular system.

Respiratory function (such as lung volumes and capacities) can be measured by spirometry. Spirometry measure how much a person inhales and exhales, as well as how quickly one exhales. As one increases physical activity, his/her lung capacity should increase. 

Blood pressure and resting heart rate should decrease over time as one increases physical activity.