Broncos WR Decker detects red-cell advantage   Eddie Royal
inhaled and exhaled, while his opponents huffed and puffed.  The
fourth quarter had arrived, and Royal wondered what the fuss was
because he was feeling spry.  Royal and his fellow Denver
Broncos had come down from the Rocky mountains to play a road
game, and it was as if they had an extra lung.  “You’re not as
tired,” Royal said. “During the fourth quarter, I think you
really notice it a lot. You don’t feel like you had played a
whole game because you were still pretty fresh.”  The Broncos
are the Sherpas of the NFL. Mountain people. Alpine athletes.
They live a mile up. Everyone else in the NFL looks up at them.
Rarefied air is their friend. The fourth quarter is their
domain.  It’s often thought the Broncos have an advantage at
home, where they’ll face the Chargers on Sunday, because
opponents must adjust to the thin air. Exertion at altitude can
cause headaches and shortness of breath.  Cris Collinsworth, a
former Cincinnati Bengals receiver, now