Measuring Physical Activity. Physical activity is difficult to measure as it involves complex motions and provides different physiological stresses. Physical activity ranges from maximal exercise to fidgeting when at rest.
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Physiological adaptation to training may be quantified through a number of diagnostic tests.
To date there is no formal training theory that quantitatively and accurately prescribes the pattern, duration and intensity of exercise to elicit a specific physiological adaptation.
Good descriptive epidemiology data can provide valuable insight:
According to statistics, young, educated males are the most likely to be active.
A problem with using age-adjusted, relative-intensity, classifications is that lower levels of fitness will increase relative intensity.
Total Daily Energy Expenditure (kcal/kg) (Several Countries)
Age 6 8 10 12 14 16 18
Boys 82 74 75 58 50 44 44
Girls 76 70 58 53 45 42 42