DOE is often seen as a manufacturing tool, or at least as a technical tool. However, any process with inputs and outputs can be improved with this tool. This video talks about 3 areas, including a focus on a running DOE which found a surprising medical issue.
Calories counted by treadmill will depend on treadmill manufacturer’s own experimentation.
A study at Stanford University took a look at seven different devices to check their accuracy. The results showed that the most accurate of them was off by an average of 27% and the least accurate by 93%. The heart rate monitor was the most reliable function, but the researchers concluded that the calorie counter should not be counted on.