Well actually, humans are getting huge everywhere.
http://www.nytimes.com/2006/07/30/health/30age.html?_r=1&ei=5094&en=a8f44bc2e9318699&hp=&ex=1154232000&partner=homepage&pagewanted=print&oref=slogin
Actually, this phenom has been documented for a long time in History circles. Its informally called the coffin effect. It is highly unlikely that even I could fit in a man's coffin from the nineteenth century. They were tiny creatures. For those of you who know me, I'm considered "short". I'm actually average height at 5'4" inches tall. That was the average grown man's size in the nineteenth century.
Its always been a dream of mine to help on a archaelogical dig at an osuary. Basically, they take volunteers and have them measure bone sizes and from that, archeaologists extrapolate the health of the population.