Page 182 - Lượng giá chức năng hệ vân động

Hinh 11.1. NhCfng thdi diem trong chu ky di

2. Cac giai doan cua chu ky di

Cac giai doan cua chu ky di diidc phan nhii sau:
- Thi cham got (heel strike ph ase): giai doan tii 0 den 15% cua chu ky di,
diidc goi la thi cham got. Siic nang cua cd the diidc truyen qua chan triidc, ban
chan ha xuong mat dat va khdp goi gap de lam giam chan dong.

- G iiia thi chong (mid - stance): giai doan tii 15 den 30% cua chu ky di
diidc goi la giiia thi chong. Chan va than minh tien ve phia triidc tren ban chan
diing yen.

- Thi day toi (push - off): giai doan tii 30 den 45% cua chu ky di la thi day
t6i. Got chan cua chan chiu siic nang rdi khoi mat dat, than minh dUdc day ve phia
triidc bdi sii tac dong manh cua cac cd gap long ban chan.
- Thi chong muon (late stance phase): giai doan tii 45 den 60% ciia chu

ky di diidc goi la thi chong muon. Khoi liidng cua cd the dan diidc loai trii de
chuyen sang chan doi ben va ngon chan bat dau nhac khoi nen nha.
- Giai doan du: chiem 40% thdi gian cua chu ky di. bat dau d thdi diem nhac

ngon (60%) cho den thdi diem cham got trd lai (100% hoac 0%). Giai doan du dUdc
phan thanh ba phan doan va khong co mot ty le chinh xac cho cac phan doan nay.
Ba phan doan do la: (1) thi du sdm (early swing phase) hay con dUdc goi la thi gia
toe (acceleration), (2) giiia thi du (mid - swing) khi chan du bang qua chan chong

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