Dumbbell ndi mtundu wa zida zothandizira zonyamula zolemetsa komanso zolimbitsa thupi, zomwe zimagwiritsidwa ntchito popanga masewera olimbitsa thupi. Chifukwa palibe phokoso poyeserera, amatchedwa dumbbell.
Ma Dumbbells ndi zida zosavuta zomwe zimagwiritsidwa ntchito kulimbikitsa minofu. Chinthu chake chachikulu ndi chitsulo choponyedwa, china chokhala ndi mphira.
Amagwiritsidwa ntchito pophunzitsa mphamvu za minofu, maphunziro a minofu pawiri. Kwa odwala omwe ali ndi mphamvu zochepa za minofu chifukwa cha kufooka kwa mayendedwe, kupweteka komanso kusagwira ntchito kwa nthawi yayitali, gwirani ma dumbbells ndikugwiritsa ntchito kulemera kwa ma dumbbells kuti azichita masewera olimbitsa thupi motsutsana ndi kukana kuphunzitsa mphamvu ya minofu.
Ma dumbbells amaphunzitsa minofu imodzi; Ngati kulemera kwawonjezeka, kugwirizanitsa kwa minofu yambiri kumafunika, ndipo kungagwiritsidwenso ntchito ngati maphunziro amtundu wa minofu.
Thandizo pakukweza zolemera ndi masewera olimbitsa thupi. Pali mitundu iwiri ya kulemera kosasunthika ndi kulemera kosinthika. ① Ma dumbbells olemera okhazikika. Kuponyedwa ndi nkhumba chitsulo, chitsulo ndodo pakati, onse malekezero a olimba kuzungulira mpira, chifukwa palibe phokoso pa kuchita, dzina lake dumbbell. Kulemera kwa ma dumbbells opepuka ndi 6, 8, 12, ndi 16 pounds (1 pound = 0.4536 kg). Zolemera za ma dumbbells olemera ndi 10, 15, 20, 25, 30 kg, ndi zina zotero. ② Ma dumbbells osinthika. Mofanana ndi barbell yochepetsedwa, muzitsulo zazifupi zachitsulo kumbali zonse ziwiri za kulemera kwa pepala lachitsulo lozungulira, pafupifupi 40 ~ 45 cm kutalika, kukweza kapena kuchita masewera olimbitsa thupi kumatha kuwonjezera kapena kuchepetsa kulemera kwake. Nthawi zambiri kuchita dumbbell ntchito, angalimbikitse minofu mphamvu ya mbali zosiyanasiyana za thupi.
Ndizodziwika bwino kuti kusanthula kosinthika kwa mphamvu ya centrifugal kuyenera kuchitika pomwe astronaut amayesa kulimba kwa thupi. Mphamvu ya Centrifugal imatha kupanga chinthu choyambirira chokhala ndi misa yaying'ono kupeza kangapo mphamvu ya kinetic kuposa nthawi zonse pakamphindi, ndikupitiliza kupanga inertia, kotero mphamvu ya centrifugal mphamvu siyinganyalanyazidwe. Makampani opanga zida zolimbitsa thupi akhala akuyesera kupeza njira zogwiritsira ntchito mphamvu zamtunduwu nthawi yomweyo pakupanga zinthu. Pansi pa izi, dumbbell yatsopano yamphamvu ya kinetic idabadwa. Imaphwanya kumverera kolemetsa kwa ma dumbbell achikhalidwe ndikupanga masewera olimbitsa thupi kukhala omasuka. Zimaphatikiza magwiridwe antchito a mpira wam'manja ndi ma dumbbells kuti apereke maphunziro ofunikira a minofu ndi zotsatira zolimbitsa thupi lonse.
Nthawi yotumiza: Aug-05-2022