Ka cika wannan jumla: Adamson ya cancanci yin tseren marathon a Wasannin Olympic na shekara ta 1984, inda ya gama a matsayi na 52 a lokacin da ya kai awa 2:25:02. Daga baya a cikin shekarar, an shirya shi don yin gasa a 1984 New York City Marathon, amma ya janye kafin farawa saboda yanayin ya yi zafi sosai. A wannan shekarar, ya lashe 1984 Philadelphia Marathon a cikin lokaci na 2:16.39, rikodin Jamaica na kasa a cikin taron. A cikin 1985, Adamson ya lashe gasar a shekara ta biyu a jere a cikin lokaci na 2: 18:27, mintuna 5 da dakika 13 a gaban kowa. Bayan tseren, Adamson ya ce yana fatan ya gudu da sauri, amma iska ta rage shi. Adamson ya fafata a gasar
ya yi tseren marathon a wasannin Olympics na 1988, inda ya kammala na 84, kuma ya yi tseren mita 10,000 a wasannin Commonwealth na 1990, inda ya gama na tara.