Qhov sib txawv ntawm qhov sib txawv ntawm concentric thiab eccentric contractions yog qhov concentric contraction ua rau cov leeg luv thaum eccentric contractions ua rau cov leeg mus elongate.
Cov leeg nqaij contraction yog cov txheej txheem nyuaj uas hloov qhov ntev ntawm cov leeg nqaij. Cov nqaij fibers ua kom nruj. Nws cuam tshuam nrog kev sib cuam tshuam ntawm cov proteins uas muaj cov tshuaj tiv thaiv kab mob actin thiab myosin thaum muaj calcium. Muaj ntau hom nqaij contractions raws li qhov kev hloov ntawm qhov ntev ntawm cov leeg nqaij thaum lub sij hawm contraction. Isometric thiab isotonic yog ob hom tseem ceeb. Isotonic contractions tsim ib lub zog los ntawm kev hloov qhov ntev ntawm cov leeg thaum isometric contractions tsim ib lub zog tsis hloov qhov ntev ntawm cov leeg. Isotonic contractions yog categorized ua ob hom concentric thiab eccentric contractions.
Kev cog lus Concentric yog dab tsi?
Concentric contraction yog ib hom isotonic contraction uas ua rau cov nqaij ntshiv thaum tsim ib lub zog. Concentric contraction tshwm sim thoob plaws hauv cov leeg nqaij nyob rau hauv cov kev taw qhia ntawm contraction ntawm cov leeg. Cov contractions no yuav tsum tau thaum nqa ib lub load. Piv txwv li, thaum lifting ib tug hnyav load, ib tug concentric contraction ntawm lub biceps ua rau lub caj npab khoov ntawm lub luj tshib. Thaum lub sij hawm concentric contraction, cross-bridge cycling tshwm sim nyob rau hauv thiaj li yuav tsim lub zog.
Daim duab 01: Hom Kev Cog Lus
A sarcomere yog qhov ua haujlwm ntawm cov leeg nqaij. Nws muaj ob qho tib si nyias actin filaments thiab tuab myosin filaments. Thaum cov nqaij fiber ntau tau qhib los ntawm cov hlab ntsha thiab cov calcium ions, cov filaments, actin thiab myosin, txav cov txheeb ze mus rau ib leeg los tsim shortening ntawm sarcomere, nqaij fiber ntau thiab tag nrho cov nqaij.
Dab tsi yog Eccentric Contractions?
Eccentric contraction yog ib hom nqaij leeg uas ua rau cov leeg ntev. Nws tshwm sim nyob rau hauv teb rau ib tug ntau dua opposing quab yuam uas yog siab tshaj lub zog generated los ntawm cov leeg. Yog li ntawd, lawv tshwm sim tawm tsam los yog nyob rau hauv opposite kev taw qhia ntawm contraction ntawm ib tug nqaij. Eccentric contractions feem ntau decelerate cov leeg pob qij txha. Cov kev cog lus no kuj tuaj yeem hloov txoj haujlwm ntawm lub zog thauj khoom.
Daim duab 02: Sarcomere Shortening thiab Lengthening
Kev cog lus tsis txaus ntseeg tuaj yeem yeem yeem lossis tsis yeem. Thaum lub sij hawm eccentric contractions, cross-bridge cycling tshwm sim los tswj qhov extension ntawm cov leeg txawm tias lub sarcomere, nqaij fiber, thiab cov leeg yog lengthening.
Dab tsi yog qhov zoo sib xws ntawm Concentric thiab Eccentric Contractions?
- Nyob rau hauv ob qho tib si concentric thiab eccentric contractions, ntev ntawm cov leeg hloov.
- Lawv tsim muaj zog.
- Kev cob qhia muaj zog muaj ob qho tib si eccentric thiab concentric contractions.
- Nyob rau hauv ob qho kev cog lus, kev caij tsheb kauj vab hla kev tshwm sim.
Qhov txawv ntawm Concentric thiab Eccentric Contractions yog dab tsi?
Concentric contraction yog ib hom nqaij leeg uas tso cai rau cov leeg kom luv. Nyob rau hauv sib piv, eccentric contraction yog ib hom contraction uas ua rau cov leeg lengthening. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm concentric thiab eccentric contractions. Thaum lub sij hawm concentric contraction, sarcomere, nqaij fiber, thiab cov nqaij ntshiv thaum lub sij hawm eccentric contraction, lawv lengthen.
Hauv qab infographic tabulates qhov sib txawv ntawm concentric thiab eccentric contractions nyob rau hauv kom meej ntxiv.
Summary – Concentric vs Eccentric Contractions
Concentric thiab eccentric contraction yog ob hom isotonic leeg contractions. Concentric contraction ua rau shortening ntawm cov leeg thaum eccentric contraction ua rau lengthening ntawm cov leeg. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm concentric thiab eccentric contractions. Sarcomere, nqaij fiber ntau thiab cov leeg luv luv thaum lub sij hawm concentric contraction. Nyob rau hauv sib piv, sarcomere, nqaij fiber ntau thiab cov leeg lengthen nyob rau hauv lub eccentric contraction.
