Ramba uchiverenga ndima iyi - 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 munhangemutange yemarathon pa 1988 Olympic Games
, achipedza wechi84, uyewo akamhanya mamita zviuru gumi kuma1990 Commonwealth Games, kwaakapedza wechipfumbamwe.