Kev muaj peev xwm ntawm kev ua si kuj yuav raug cuam tshuam los ntawm cov leeg muaj fiber ntau
Koj puas yog ib tug zoo dua ntais lossis khiav nrug? Koj yuav zoo rau ob leeg? Ntau tus neeg ntseeg hais tias muaj ceev dua lossis qeeb twitch nqaij fibers yuav txiav txim seb cov kev ncaws pob ncaws pob zoo li cas thiab seb lawv teb li cas.
Nqaij Fiber Ntau Hom
Skeletal leeg yog ua los ntawm cov pob khoom ntawm cov leeg nqaij leeg hu ua myocytes. Txhua myocyte muaj ntau myofibrils, uas yog strands ntawm proteins (actin thiab myosin) uas tau lob rau sib thiab rub.
Qhov no ua kom luv luv cov leeg thiab ua rau cov leeg nqaij.
Nws feem ntau lees txais tias cov leeg cov leeg ua tau tawg rau hauv ob lub ntsiab: qeeb twitch (hom I) cov leeg nqaij thiab ceev twitch (hom II) nqaij fibers. Cov twitch twitch yooj yim tuaj yeem tau ntxiv categorized rau hom IIa thiab hom IIb fibers.
Cov kev txawv no zoo li cuam tshuam rau cov nqaij ntshiv li cas rau kev kawm thiab kev siv lub cev, thiab txhua hom fiber ntau hauv nws txoj kev muaj peev xwm los cog lus raws li ib txoj kev. Tib neeg cov leeg muaj kev sib tov sib xyaw kom haum qis qis thiab qis dua. Qhov nruab nrab, cov neeg muaj li ntawm 50 feem pua qeeb qeeb thiab 50 feem pua qis twitch fibers hauv feem ntau ntawm cov leeg siv rau kev txav.
Qeeb Twitch Muscle Fibers (Hom Kuv)
Cov qeeb twitch nqaij leeg nyhav ntau dua ntawm kev siv oxygen los ua kom muaj ntau dua adenosine triphosphate (ATP) roj kom nruam, ncua cov nqaij mob ntev ntev. Lawv tua hluav taws qeeb tshaj li ceev ceev twitch fibers thiab tuaj yeem mus ntev ua ntej lawv qaug zog.
Yog li ntawd, qeeb twitch qeeb qeeb yog pabcuam kev sib tw khiav ua si thiab caij tsheb kaujvab rau sijhawm.
Fast Twitch Nqaij Fibers (Hom II)
Vim tias cov sib tw twiv yoo siv ceev siv cov tshuaj metabolism hauv tsev los tsim cov roj, lawv zoo dua thaum tsim tau tawg ntho ntawm lub zog los yog khiav ceev tshaj cov nqaij ntshiv. Txawm li cas los, lawv qaug zog sai dua.
Cov twv ceev ceev feem ntau ua rau tib lub zog ntawm kev qoj ib ce ua qeeb qeeb, tab sis lawv tau txais lawv lub npe vim tias lawv tuaj yeem tua hluav taws sai dua. Muaj ntau dua twitch fibers yuav ua tau ib qho cuab tam rau lub sprinter txij thaum nws xav tau sai sai ua kom muaj zog ntau.
Fast Twitch Nqaij Fibers (Hom IIa)
Cov kev sib tw twv ceev nrawm no kuj raug hu los ua cov lus sib tw ceev nrawm. Lawv siv tau siv cov aerobic thiab cov metabolism hauv kev noj qab haus huv yuav tsum sib npaug los ua lub zog. Nyob rau hauv no txoj kev, lawv yog ib qho ua ke ntawm hom I thiab hom II leeg fibers.
Fast Twitch Nqaij Fibers (Hom IIb)
Cov kev sib tw twv ceev yoo siv cov metabolism hauv lub cev los ua kom muaj zog thiab yog cov "classic" ceev twitch nqaij fibers uas tawm ntawm qhov ua tau ceev, muaj hwjchim loj heev ntawm kev ceev. Cov leeg nqaij no muaj qhov siab tshaj plaws ntawm qhov contraction (ceev hluav taws) ntawm tag nrho cov leeg fiber ntau hom, tab sis nws kuj muaj feem ntau ntawm kev nkees thiab tsis tuaj yeem kav ntev ua ntej nws yuav tsum tau so.
Nqaij Fiber Hom thiab Kev Ua Si Kev Ua Si
Koj cov nqaij fiber ntau yuav cuam tshuam yam kev ua si uas koj muaj los ntawm kev zoo los yog seb koj puas ceev lossis muaj zog. Olympic ncaws pob yuav poob rau kev ua si uas phim lawv cov tshuaj pleev pleev . Olympic sprinters tau pom tias muaj li 80 feem pua ceev twitch fibers thaum cov neeg uas tau zoo nyob rau hauv marathons yuav muaj 80 feem pua qis twitch fibers.
Puas Hloov Txoj Kev Hloov Mus Ntev Fiber Hom?
Muaj qee cov pov thawj uas qhia tau hais tias cov nqaij pob txha tib neeg hloov tau cov qaub ncaug los ntawm "ceev" mus "qeeb" vim kev cob qhia. Qhov no tsis yog to taub, thiab kev tshawb fawb tseem tseem saib qhov lus nug ntawd.
Kev Txhim Kho Cov Kev Ua Si Los Txhawm Txhaum Li Cas Tag Nrho Cov Nqaij Hlav
Nco ntsoov tias qhov kev txawv ntawm caj ces tej zaum yuav ua rau cov neeg sib tw ua kis las zoo. Tab sis tom qab txoj cai tswj hwm ntawm kev ntsuas huab cua yuav ua rau kev ua tau zoo ntawm tus neeg ncaws pob. Nrog kev cob qhia zoo ib ce, cov leeg nqaij tsim muaj peev xwm tsim tau ntau dua thiab txhim kho lawv lub peev xwm tswj hwm thiab ua raws li kev nyuaj siab ntawm kev qoj ib ce.
Yog Nqaij Fiber Hom Dab Tsi Ua Tus Elite Athlete Elite?
Fiber hom yog ib feem ntawm ib tug neeg ua si zoo, tab sis nws ib leeg yog ib qho tsis zoo ntawm kev ua tau zoo. Muaj ntau ntau lwm yam uas ua rau kev txiav txim siab txog athleticism, nrog rau kev npaj rau kev puas siab ntsws , kev noj zaub mov kom zoo thiab dej haus , kom txaus txaus, thiab muaj cov cuab yeej tsim nyog thiab txias.
> Qhov chaw:
> Clark M, Lucett S, Sutton BG. NASM Yam Ntawm Tus Khoos Kas Ib Qho Kev Kawm Qib Siab 4 tsab ntawv kho dua tshiab . Philadelphia: Wolters Kluwer Health / Lippincott Williams & Wilkins; 2014.
> Powers SK, Howley ET. Qoj Physiology: Txoj Kev Tsim Nyog thiab Daim Ntawv Thov mus Ua Si thiab Ua Tau Zoo . New York: McGraw-Hill Higher Education; 2012.