I was being sarcastic. You cannot compare the running times of a horse with a human being.
I never compared humans to horses. I compared horses from 1920 to horses today. Since we're talking about humans from that era and comparing them to today, I thought that would be a good place to start. After all, training methods have improved for humans and horses, and horses are specifically bred for speed while humans aren't specifically bred for much of anything. The Kentucky Derby is run on the same course today as it was in 1920, so again, I ask once more - how many of today's modern runners are running in leather shoes on cinder tracks, as Jesse Owens did?
You are trying to say that horses ran just as fast years ago than horses today
I'm not "trying" to say anything. The facts are the facts. "Old Rosebud", the 1914 winner, ran essentially the same time as "Giacomo" this year - half-a-second seperates them over 90 years of training and breeding.
That has absoluletly nothing to do with how humans have, and will continue to get bigger.
Explain to us why this is so. As dempseyfire noted, a few scant generations of haphazard breeding aren't enough for any evolutionary pressure on size to take effect.
Have a look at the times swimmers finish races compared to 50 years ago, they are much much faster today.
Indeed, I'm a former competative swimmer. What can you tell us about the swimming techniques practiced during, say, Johnny Weissmuller's era and today? The front crawl wasn't even a competition stroke until Jim Jeffries was heavyweight champion of the world, with the butterfly stroke first entering competition in 1936! Imagine that - the basic "dolphin kick" not even in practice during Joe Louis's early career! And you're surprised that these brand-new techniques were improved on soon after they debuted? Wowie!
What was the average weight of a top 10 heavyweight in 1950? At a guess I'd say 13-14 stone, maybe slightly higher, maybe not.
What is the average weight of a top 10 heavyweight today? At a guess about 16-17 stone, maybe slightly higher, maybe not.
Bigger doesn't equate to better. Bob Fitzsimmons was knocking out 6'6 brawlers when he weighed 160lbs. Do you think Mike Tyson at 240lb was a better fighter than Mike Tyson at 215? Was Fred Fulton at 6'4 and 220lbs a more dangerous fighter than Jack Dempsey at 6'1 and 187? If size conferred such an advantage you'd expect to see it most clearly when your average heavyweight was around 190lb, would you not?
So what does that tell you then? People today are naturally bigger.
"Naturally" has nothing to do with it. Better medicine and nutrition prevent diseases which stunt growth and bring up the overall average (seen anyone with rickets lately?) but I still don't see any evidence that this tiny increase in average size, which you yourself quote as being a mere INCH in height, improves the quality of a fighter.
"Average adult Americans are about one inch taller, but nearly a whopping 25 pounds heavier than they were in 1960, according to a new report from the Centers for Disease Control and Prevention (CDC). The bad news, says CDC is that average BMI (body mass index, a weight-for-height formula used to measure obesity) has increased among adults from approximately 25 in 1960 to 28 in 2002."
People are fatter - that's your strongest evidence here. Of course many elite athletes are juiced to the gill with steroids, but that's another story for another thread. I'm pretty sure carrying around that extra bulk won't improve a fighter's ability to compete for a mere 15 rounds, to say nothing of the 20+ rounders of the early era.