KryptonianKnight,

These are the 100M Sprint World Records for the last 100 years or so.

Asafa POWELL........9.77....2006
Justin GATLIN.........9.77....2006
Asafa POWELL........9.77....2005
Maurice GREENE......9.79....1999
Donovan BAILEY......9.84....1996
Leroy BURRELL........9.85....1994
Carl LEWIS.............9.86....1991
Leroy BURRELL........9.90....1991
Carl LEWIS.............9.92....1988
Calvin SMITH..........9.93....1983
Jim HINES..............9.95....1968
Jim HINES..............9.9.....1968
Armin HARY............10.0....1960
Willie WILLIAMS......10.1....1956
Jesse OWENS.........10.2....1936
Percy WILLIAMS......10.3....1930
Charles PADDOCK.....10.4....1921
Donald LIPPINCOTT..10.6....1912
Frank JARVIS..........10.8....1900
Tom BURKE.............11.8....1896

Some of the technological improvements such as running spikes, starting blocks, and all weather polyurethane tracks etc. account for better times.

You can see that times were reduced by large margins at the start of the last century when technology first started to impact the sport. Now we are down to miniscule increases which can easily be explained by improved diet, training techniques and a greater understanding of the type of lifestyle needed to look after and hone the body.

Evolution is playing no part whatsoever. It just cannot have an impact on a hundred year timescale in anything as complex as a human. Or are you willing to say that evolution affected a change over a ten year period, allowing over .1 of a seconds reduction (1991 - 1999)? If not, then why think evolution is the cause for any of the changes?

Blacknad.