Masters M45 400 metres hurdles world record progression explained

This is the progression of world record improvements of the 400 metres hurdles M45 division of Masters athletics.

Key:

Hand	Auto	Athlete	Nationality	Birthdate	Location	Date
	53.57	Aramis Diaz		22 November 1974	Rome	5 September 2020
	53.90	Aramis Diaz		22 November 1974	Padova	29 August 2020
	54.92	Edward Betts		18 February 1971	Palencia	9 July 2016
	55.18	Guido Müller		22 December 1938	Malmö	1 August 1986
55.7		Jack Greenwood		5 February 1926	San Diego	24 August 1972

References

Masters Athletics 400 m hurdles list