This is the progression of world record improvements of the 400 metres M45 division of Masters athletics.
Key
HandAutoAthleteNationalityBirthdateLocationDateRef48.55Ricardo Menendez Gonzalez26 August 1978Alcobendas6 July 202449.09Allen Woodard16 November 1969Houston18 March 2017 49.32 Allen Woodard 16.11.1969 Grand Rapids 15.07.2016 49.69 Allen Woodard 16.11.1969 Houston 04.04.201549.89 Fred Sowerby11.12.1948ATQ29.01.199450.18Khalid Mulazim28.03.1966Berea29.07.201150.20Fred Sowerby11.12.1948Eugene12.08.199450.24Stan Whitley17.12.1945Los AngelesNational Masters News September 199212.07.199250.46James Burnett13.01.1940Rome29.06.198550.61Reginald Austin16.10.1936San Juan23.09.198351.11Milton Newton06.11.1933Philadelphia05.07.198051.7Richard "Dick" Stolpe03.03.1925London24.08.1972
References Citations
Sources Masters Athletics 400 m list