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Main article: 4 × 400 metres relay at the World Championships in Athletics Men [ edit ] Championships

a b c d "Mixed 4 x 400 Metres Relay - Round 1 Results Summary" (PDF). World Athletics. 19 August 2023 . Retrieved 19 August 2023. A USA team ran 2:56.47 in Athens in 1997 but the performance was annulled due to the use of performance-enhancing drugs by Antonio PettigrewMen's 4 × 400 m Relay Final Results" (PDF). olympics.com. 7 August 2021. Archived from the original (PDF) on 7 August 2021 . Retrieved 26 August 2021. It left the USA's Holmes free to cross the line first and claim not only a gold medal but a new world record.

a b c d "4 × 400 m Relay Mixed − Final − Results" (PDF). IAAF. 29 September 2019 . Retrieved 3 October 2019. b Original silver medalists, Russia, were stripped of their medal for doping offenses. Following reallocation, Jamaica will be promoted to the silver medal, and Ukraine to the bronze. [38]https://www.reuters.com/article/us-olympics-rio-doping-russia/russia-stripped-of-beijing-2008-4x400m-womens-silver-medal-idUSKCN10U242 Olga Nazarova and Olga Bryzgina ( USSR) both ran a 47.80 split in the 1988 Seoul Olympic final; the Soviet team's final time of 3:15.17 is the current world record.

All Strident tyres and inner tubes are carefully sourced to ensure they meet the stringent quality control standards that all Strident products must adhere to. Quincy Watts ran a 43.1 split and Steve Lewis (USA) ran a 43.4 split in the 1992 Barcelona Olympic final. The quartet of Justin Robinson, Rosey Effiong, Matthew Boling and Alexis Holmes came home in 3:08.80 ahead of Great Britain, who won silver, and bronze medallists Czechia (Czech Republic). Javier Clavelo Robinson (21 August 2022). "Miller-Uibo delights home crowd as nine more records fall at NACAC Championships". World Athletics . Retrieved 31 August 2022.dq1 The Russian team ( Anastasiya Kapachinskaya, Tatyana Firova, Lyudmila Litvinova and Antonina Krivoshapka) originally finished third in the 2009 World Championships, but was disqualified after Kapachinskaya was found to have used performance-enhancing drugs. Allyson Felix (USA) ran a 47.72 split in the 2015 Beijing World Championships final, a 48.01 split in the 2007 Osaka World Championships final, and a 48.20 split in the 2012 London Olympic final.

Women's 4 × 400 m Relay Final Results" (PDF). World Athletics. 24 July 2022 . Retrieved 6 August 2022. a b c d e "4 x 400m Mixed Relay Heat 2 - 2020 Olympics" (PDF). Archived (PDF) from the original on 30 July 2021. The P1462 is a 4”x6” 2-way full-range speaker rated at 35 watts RMS designed for fanatics needing a quality factory replacement. Includes two speakers with adapter plates, integrated high-pass crossovers and mounting hardware. Sold in pairs (2 each). A Russian team of Svetlana Pospelova, Natalya Nazarova, Kseniya Vdovina and Tatyana Firova originally finished second in the 2010 World Indoor Championships, but was disqualified after Firova was found to have used performance-enhancing drugs. [41] A USA team of James Davis, Jerome Young, Milton Campbell and Tyree Washington originally won in the 2003 World Indoor Championships, but was disqualified after Young was found to have used performance-enhancing drugs. [40]A Jamaican team of Bobby-Gaye Wilkins, Clora Williams, Davita Prendergast and Novlene Williams-Mills originally finished third in the 2010 World Indoor Championships, but was disqualified after Wilkins was found to have used performance-enhancing drugs. [41]