▁Marian ▁Wor on in ▁had ▁uno fficial ly ▁sur pass ed ▁the ▁bar rier ▁with ▁a ▁time ▁of ▁ 9 . 9 9 2 ▁seconds ▁in ▁ 1 9 8 4 ). ▁In ▁ 2 0 1 1 , ▁Z imb ab we an ▁N gon id zas he ▁Mak ush a ▁became ▁the ▁ 7 6 th ▁man ▁to ▁break ▁the ▁bar rier , ▁yet ▁only ▁the ▁fourth ▁man ▁not ▁of ▁West ▁African ▁descent . ▁No ▁spr inter ▁from ▁South ▁Asia , ▁East ▁Africa ▁or ▁North ▁Africa ▁has ▁officially ▁achieved ▁this ▁fe at . ▁In ▁ 2 0 1 5 ▁Su ▁B ingt ian ▁of ▁China ▁became ▁the ▁first ▁eth nic ▁East ▁Asian ▁ath lete ▁to ▁officially ▁break ▁the ▁ 1 0 ▁second ▁bar rier ▁and ▁British ▁ath lete ▁Adam ▁Gem ili ▁– ▁who ▁is ▁of ▁mixed ▁Iran ian ▁and ▁Mor oc can ▁descent ▁– ▁became ▁the ▁first ▁ath lete ▁with ▁either ▁North ▁African ▁or ▁Middle ▁Eastern ▁her itage ▁to ▁break ▁the ▁ten ▁second ▁bar rier . ▁Before ▁the ▁ 2 0 0 4 ▁Ath ens ▁Games , ▁ 4 9 4 ▁of ▁the ▁top ▁ 5 0 0 ▁times ▁for ▁the ▁ 1 0 0 m ▁were ▁held ▁by ▁spr inter s ▁who ▁were ▁of ▁West ▁African ▁descent . ▁ ▁Some ▁studies ▁have ▁claimed ▁that ▁bi ological ▁factors ▁may ▁be ▁largely ▁responsible ▁for ▁the ▁dis pro port ion ate ▁success ▁in ▁s print ing ▁events ▁enjoyed ▁by ▁athlet es ▁of ▁West ▁African ▁descent . ▁Chief ▁among ▁these ▁is ▁a ▁pre ponder