The effect of physical activity intensity on the level of physical activity in elementary school students obtained by a double-labeled water method

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The energy consumption of elementary school students was measured using a double-labeled water method, which is the gold standard. In a comparison of grade 5 and grade 6 regarding the same students, no increase in energy consumption was observed though their physiques were improved, thus suggesting a decline in the amount of physical exertion. Moreover, from a comparison of elementary school students in farming or fishing villages and those in urban cities, it was shown that the intensity of physical activity heavily influences energy consumption in elementary school students. However, there are issues with applying the index of physical activity intensity of adults to elementary school students, so it became clear that a new index needs to be created.