On Google Scholar we can find a lot of papers where treadmills are used: https://scholar.google.com/scholar?hl=de&as_sdt=0%2C5&q=treadmill&btnG= But how do the treadmills which are used in papers differ from sports treadmills? Some years ago we became interested in consumer grade heart rate monitors trough DC Rainmaker, Rob ter Horst and others. But after a long evaluation period …