Downhill walking as a possible form of negative work.
D003201:Computers; D006801:Humans; D007773:Lactates / Q000097:blood* / Q000378:metabolism*; D010100:Oxygen / Q000097:blood; D010101:Oxygen Consumption; D005082:Physical Exertion; D011773:Pyruvates / Q000097:blood* / Q000378:metabolism*
D007773:Lactates; D011773:Pyruvates; D010100:Oxygen