Pedzisa mashoko anotevera: Adamson akakwanisa kumhanya marathon pamitambo yeOlympic ya1984, kwaakapedza ari wechi52 nenguva ya2:25:02. Gare gare mugore iroro, akanga aronga kukwikwidza pa1984 New York City Marathon, asi akabva asati atanga sezvo mamiriro okunze akanga achidziya. Mugore rimwe chetero, akakunda 1984 Philadelphia Marathon nenguva ye2:16.39, rekodhi yenyika yeJamaican muchiitiko ichi. Muna 1985, Adamson akakunda chiitiko chacho kwegore rechipiri rakatevedzana munguva ye2:18:27, maminitsi mashanu nemasekondi gumi nematatu mberi kwevamwe vose. Mushure mokumhanya, Adamson akati akanga achitarisira kumhanya nokukurumidza, asi akaderedzwa nemhepo. Adamson akakwikwidza mu
akamhanya nhangemutange yemarathon pamitambo yeOlympic ya1988, achipedza ari wechi84, uye akamhanyawo nhangemutange yemamita 10 000 pamitambo yeCommonwealth ya1990, kwaakapedza ari wechipfumbamwe.