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Hugh Pickens writes:

There are some good reasons it's been 37 years since the last triple-crown winner as Lexi Pandell wrote on June 3 that post-race recovery is no joke for a thousand-pound animal that can run more than 40 miles per hour. There are two weeks between the Derby and the Preakness, and three weeks between the Preakness and the Belmont. That tight schedule—and the super-specific needs of racehorses—means horses competing in the grueling back-to-back-to-back Triple Crown races have a big disadvantage against fresh horses. First, as a horse races, its muscles produce lactic acid. In humans, glycogen recoup takes about 24 hours. But horses take several days to process lactic acid and restore glycogen reserves. Trainers make sure their charges drink plenty of water and sometimes even use intravenous fluids to aid that repair process. Secondly, in addition to being the last race of the Triple Crown, the Belmont Stakes is also the longest. That's no easy feat, even for a racehorse. When a horse runs a tough race (or has a new workout at a longer distance), its muscles break down. Then, during rest, they reknit and adapt. A horse that has skipped the Preakness, however, has the luxury of time. Mubtaahij, who some picked to win the Belmont, had plenty of rest so he could be pushed for hard workouts two weeks prior to the Belmont.

Finally, at different points in its stride, a galloping horse puts all its weight on a single leg. That limb bears three times more weight than usual when galloping on a straightaway and, thanks to centrifugal force, a load five to 10 times greater on turns. This translates to skeletal microdamage. Race a horse during that critical period and you increase the risk of serious injuries mid-race. Two weeks [seven years] ago, vets were forced to euthanize the promising gray thoroughbred filly, Eight Belles, when she collapsed on the track after completing the race at Churchill Downs, suffering from two shattered ankles in her front legs. A fresh horse won't face any of those problems. Even a horse that ran in the Derby but skipped the Preakness will have five weeks to rest, and plenty of time for normal skeletal damage to repair, before the Belmont. "So, American Pharoah [sic], it'd be awesome if you win the Triple Crown, but you probably won't," concluded Pandell. "It's not your fault. It's science and those pesky fresh horses." Science was wrong.

[Ed note: The proper spelling of the title for an ancient Egyptian king is "Pharaoh." This ABC News story American Pharoah Rides Misspelled Name to Brink of History notes the registered name for the horse is "American Pharoah" and provides some background on how that came to be.]