Essentially the administrators did not know the capabilities of women and were overcautious not to put them into too difficult events.

Gayle Kellon is credited with the first record in 1982 at 41.09, set at the CIF California State Meet.

Danny Harris had the low hurdle mark at 35.52, set in 1983 (just one year before he won the Olympic silver medal) when the 2 ft 6 in (0.76 m) height was terminated.

The following year, George Porter ran 36.10 over the 3 ft 0 in (0.91 m) intermediate hurdles, but his 35.32 in 1985 is the first recognized record.

Wyatt set his record in the preliminary round anticipating his successful attempt to double in the 400 meters.

While men of all ages have run over 300 hurdles, the youngest official division to use the distance is M60.

Prior to 2010, older age divisions also did 300 hurdles, though the number of competitors was small.

[2][3] The increment does not exist on standard hurdles, which caused resistance from some NGBs, but the rules were adopted worldwide.

Also many training hurdles (used to teach smaller, youth beginners) will go to 27 inches and lower.

The world record progressions for M60, M65 and M70 were dominated by Jack Greenwood for a decade as he passed through each division.

The M85 division was held by Hugo Delgado Flores at 1:07.99 and Ilmari Koppinen had run 2:01.71 at M90.

The W50 division has been led by Brenda Parkinson and Jan Hynes before Christine Müller set the current world record at 45.05.