BAI BAO KHOA HOC THirC TRANG HOAT OONG TAP LUYEIV THE DUG THE THAO CUA NGirffI DAN CAC fljA PHirtfNGflAVA DANG X A Y DlfNG NONG THON MOfl Bill Ng9C* Nguyen Hong Dang** Nguyen Van Hu'ng*** f T6mtat: TT-^I- - ^ Bang phu'ong phap nghiSn ci>u khoa hgc thu*ng quy, chung toi tiln hanh xSc flinh th^c trgng theo cSc llSu chi: Man t h i thao ngu'M din tham gia; Phircyng thiic ho?t aong TDTT; Vi tri l