| The human rear is perfectly designed to support the
weight of the body on two "sit bones." Those structures are protected
by muscle and fat and have no arteries or nerves that could be crushed
by your weight. As long as you are sitting on a flat surface, like a chair
or couch, your sit bones easily support your weight. It's a different
story when you sit for long periods on a narrow bicycle seat. The penis
is part of a hydraulic system. When stimulated, its twin chambers
fill with blood until it's erect. After ejaculation, the blood leaves
and the penis softens again.
Circulation Problem
But about half that hydraulic system is inside the body.
When a man sits on a narrow bicycle seat, his body weight can crush the
pudendal artery and nerves that serve the penis. That sensitive area between
the anus and the scrotum is known as the perineum. So bike riding can
result in temporary and permanent impotence. Extra padding or jell padding
in the seat does not help because the padding bunches up and also cuts
off circulation.
Researching The Problem
Researchers have discovered that nerves, arteries and
veins in the perineum can indeed be damaged by bicycle seats. Moreover,
some cyclists have fallen on the bike's cross bar and injured the groin.
The bike-related impotence problems vary: Some erections are not sustainable
because although blood gets into the penis, damaged valves can't hold
it there. Others may have trouble ejaculating due to decreased sensation.
Overweight riders and cyclists who peddle many miles weekly are at higher
risk for impairment.
Guy-friendly bike seats
Of course, the picture isn't totally bleak. The perfect
seat would look like a toilet seat and would remove all pressure from
delicate areas, some men in the West have switched to recumbent bicycles
in which the rider sits reclined and peddles with his legs stretched out
in front. Others use wider saddles or switch to one of the half dozen
seats that claim to be more guy-friendly. Some of those seats are hollow
in the middle so the perineum is not crushed, and some are basically two
large circles upon which the sit bones rest. Some have a large wedge or
oval cutouts in the middle while still others have a long groove down
the middle.
Researchers know exactly how numb the genitals become
because they tested those areas with a device known as an esthesiometer—a
gadget used to measure the sensitivity, or lack thereof, in people with
diabetes who often lose feeling in their hands and feet. |