Question: A study reported in the Journal of the American Medical Association investigated the cardiac demands of heavy snow shoveling. Ten healthy men underwent exercise testing with a treadmill and a cycle ergometer modified for arm cranking. The men then cleared two tracts of heavy, wet snow using a lightweight plastic shovel and an electric snow thrower. Each subjects heart rate¸bloodpressure¸oxegen uptake and perceived exertion during snow removal were compared with the values obtained during the treadmill and arm cranked ergometer testing. Suppose the following table gives the heart rates in beats per minute for each of the ten subjects.