Uthini umjikelo weesetyhula

Umxholo

• I-physiology yomjikelezo womntu ojikelezayo
• Ukuphazamiseka kwesingqi sokujikeleza

Umzimba womntu ulawulwa yiwotshi yangaphakathi yebhayiloji kwimisebenzi yayo yemihla ngemihla, njengoko kunjalo ngamaxesha okondla kunye nokuvuka kunye namaxesha okulala. Le nkqubo ibizwa ngokuba ngumjikelezo we-circadian okanye isingqisho se-circadian, esinempembelelo enkulu ekwetyisweni, ekuvuseleleni iiseli nakulawulo lobushushu emzimbeni.

Umntu ngamnye unewotshi yakhe yangaphakathi kwaye ke ngoko abantu bahlelwe baba ngabantu basekuseni, abo bavuka kwakusasa bavuke kwakusasa, abantu basemva kwemini, abo bavuka kade kwaye balala kade, kwaye nabalamleli.

I-physiology yomjikelezo womntu ojikelezayo

Isingqisho se-circadian simele ixesha leeyure ezingama-24 apho imisebenzi yomjikelo webhayoloji yomntu igqityiwe kwaye apho kulawulwa khona ukulala kunye nokutya. Ixesha lokulala lihlala malunga neeyure ezisi-8 kwaye ixesha lokuvuka lihlala malunga neeyure ezili-16.

Ngexesha lasemini, ikakhulu ngenxa yempembelelo yokukhanya, i-cortisol iveliswa, ekhutshwa ziincindi zeadrenal kwaye le hormone iphantsi kakhulu ebusuku ngexesha lokulala kwaye yonyusa kusasa, ukwandisa ukuvuka emini. Le hormone inokunyuka nangamaxesha oxinzelelo okanye ibe phezulu kwiimeko ezingapheliyo, ezinokuthi zithintele ukusebenza kakuhle komjikelo we-circadian. Jonga ukuba yeyantoni ihomoni yecortisol.

Ngorhatya, imveliso ye-cortisol iyancipha kwaye inyuse imveliso ye-melatonin, enceda ukulala, ukuyeka ukuveliswa kusasa. Ngesi sizathu, abanye abantu abanobunzima bokulala, bahlala bethatha i-melatonin xa kurhatyela, ukunceda ukulala.

Ukuphazamiseka kwesingqi sokujikeleza

Umjikelo we-circadian unokutshintshwa kwezinye iimeko, ezinokubangela ukuphazamiseka kokulala kwaye zibangele iimpawu ezinje ngokulala kakhulu emini kunye nokulala ebusuku, okanye zibangele iingxaki zempilo. Yazi ukuba zeziphi iingxaki zomjikelo ojikelezayo.