I-Dumbbell iwuhlobo lwemishini ewusizo yokuphakamisa izinsimbi nokuzivocavoca umzimba, esetshenziselwa ukwakha ukuqeqeshwa kwamandla emisipha. Ngenxa yokuthi awukho umsindo lapho uzilolonga, ibizwa ngokuthi i-dumbbell.
Ama-Dumbbells angamathuluzi alula asetshenziselwa ukuqinisa imisipha. Impahla yayo eyinhloko iyinsimbi ekhonjiwe, enye inongqimba lwenjoloba.
Isetshenziselwa ukuqeqeshwa kwamandla emisipha, ukuqeqeshwa kokunyakaza kwemisipha. Ezigulini ezinamandla aphansi emisipha okubangelwa ukukhubazeka kokunyakaza, ubuhlungu nokungasebenzi isikhathi eside, bamba ama-dumbbells futhi basebenzise isisindo sama-dumbbells ukuze basebenzise ngokuzikhandla ngokumelene nokumelana nokuqeqesha amandla emisipha.
Ama-Dumbbells aqeqesha umsipha owodwa; Uma isisindo senyuka, ukuhlanganiswa kwemisipha eminingi kuyadingeka, futhi kungasetshenziswa njengohlobo lokuqeqeshwa kwesenzo se-muscle compound.
Usizo lokuphakamisa izinsimbi kanye nokuzivocavoca umzimba. Kunezinhlobo ezimbili zesisindo esingaguquki nesisindo esilungisekayo. ① Ama-dumbbell anesisindo esingashintshi. Sakaza ngensimbi yengulube, insimbi yensimbi phakathi, yomibili imikhawulo yebhola eliyindilinga eliqinile, ngoba akukho msindo ngesikhathi sokuzilolonga, okuthiwa i-dumbbell. Izisindo zama-dumbbell alula ziyi-6, 8, 12, kanye ne-16 pounds (1 iphawundi = 0.4536 kg). Isisindo sama-dumbbell asindayo yi-10, 15, 20, 25, 30 kg, njll. ② Ama-dumbbell aguquguqukayo. Ngokufanayo ne-barbell encishisiwe, kubha yensimbi emfushane emikhawulweni yomibili yesisindo seshidi lensimbi eliyindilinga, cishe ubude obungama-40 ~ 45 cm, ukuphakamisa noma ukuzivocavoca umzimba kungandisa noma kwehlise isisindo. Ngokuvamile ukwenza ama-dumbbell exercises, angaqinisa amandla emisipha yezingxenye ezihlukahlukene zomzimba.
Kwaziwa kahle ukuthi ukuhlaziywa kokuzivumelanisa nezimo kwamandla e-centrifugal kufanele kwenziwe lapho i-astronaut ivivinya ukuqina ngokomzimba. Amandla e-Centrifugal angenza into yokuqala enesisindo esincane ithole amandla e-kinetic aphindwe izikhathi eziningana kunokuvamile ngomzuzwana, futhi iqhubeke nokukhiqiza inertia, ngakho amandla we-centrifugal force angeke athathwe kancane. Imboni yemishini yokufaneleka ibizama ukuthola izindlela zokusebenzisa lolu hlobo lwamandla e-kinetic asheshayo ekwakhiweni komkhiqizo. Ngaphansi kwalo mkhuba, kwazalwa i-kinetic energy dumbbell esanda kwakhiwa. Idabula umuzwa osindayo wama-dumbbell endabuko futhi yenza ukuvivinya umzimba okunamandla kukhululeke kakhudlwana. Ihlanganisa izici zokusebenza zebhola lesihlakala kanye nama-dumbbell ukunikeza ukuqeqeshwa kwemisipha ebalulekile kanye nomphumela wokuzivocavoca umzimba wonke.
Isikhathi sokuthumela: Aug-05-2022