At the gym: A modern re-enactor walks on a treadmill in a full suit of 15th century armor. CREDIT: Graham Askew, University of Leeds View full size image

As if flying arrows and burning pitch weren’t enough to worry about, medieval knights also had to battle their own armor.

A new study that put armor-wearing volunteers on treadmills finds that wearing a full suit of armor (which might weigh up to 110 pounds, or 50 kilograms), takes more than twice the energy of walking around unencumbered. Even lugging around a backpack of equal weight is less energy-intensive than wearing armor, the study found, because wearing 17 pounds (8 kg) of steel plates on each leg requires no small amount of extra exertion.

On occasion, armor’s weight may have turned the tides of battles, said lead study researcher Graham Askew of the University of Leeds. In 1415, heavily armored French knights advanced across a muddy field toward a lightly armored English force in the Battle of Agincourt.

to read more, go to:    http://www.livescience.com/15128-armor-drained-medieval-knight-energy.html