Dr. Radclyffe Hall makes the following interesting statement with
regard to the amount of air we consume in repose, and at different
degrees of activity: When still, we use 500 cubic inches of air in a
minute; if we walk at the rate of one mile an hour, we use 800; two
miles, 1,000; three miles an hour, 1,600; four miles an hour, 2,300.
If we run at six miles an hour, we use 3,000 cubic inches; trotting a
horse, 1,750; cantering, 1,500.