Gano Maɓalli: Saurin Kyauta Daga Ganyen
Masu tuki da ke neman inganta lokutan gwajin lokaci sukan koma ga fasahar aerodinamika, tsauraran matsayi, ko horo mai tsari. A binciken da Lansley da abokan aikinsa suka wallafa a 2011 a Medicine & Science in Sports & Exercise, an tambayi tambaya mai sauƙi: shin shan lita 0.5 na ruwan beetroot, a shafe awanni kaɗan kafin farawa, zai iya hanzarta direban a tazarar tuki da ta dace?
A cikin maza masu tsere tara da aka gwada, amsar ta kasance eh. Sha ruwan beetroot mai nitrate kusan awanni 2.5 kafin gwaji ya haifar da ingantaccen aikin gwajin 4 km da kashi 2.8 % da kuma gwajin 16.1 km da kashi 2.7 %. Hakanan, masu tuki sun ƙara ƙarfi ba tare da wani ƙaruwa a yawan amfani da iska (VO₂) ba. Wadannan riba kanana ne a ma'auni, amma suna iya zama muhimmai a gasar da ta fi komai dogaro da daƙiƙa.
Tsarin Bincike: Ruwan Nitrate‑Mai‑Ƙarfi vs Placebo Da Aka Rage Nitrate
Binciken ya yi amfani da tsari na bazuwar juyawa (randomized crossover). Bayan wani lokaci na saba da dabaru, maza masu tsere tara a matakin kulob sun kammala gwaje‑gwaje a yanayi biyu. A ɗaya, sun sha lita 0.5 na ruwan beetroot da ke ɗauke da kimanin mmol 6.2 na nitrate. A ɗayan, sun sha lita 0.5 na ruwan beetroot da aka cire yawancin nitrate, wanda ke ɗauke da kusan mmol 0.0047 na nitrate.
Placebo ɗin yana da muhimmanci: ruwan beetroot ɗin da ba shi da nitrate yana da kamanni da ɗanɗano iri ɗaya, don haka ba a iya bambance su da ido. Wannan yana taimakawa a ware tasirin nitrate daga sauran sinadarai da ke cikin beetroot, da kuma rage tasirin zato na shan abin da ake tunanin “tattalin sport”.
A duka yanayin, an sha abin sha kusan awanni 2.5 kafin direbobi su kammala gwajin 4 km da 16.1 km. Kowanne direba ya zama kansa a matsayin abin kwatanta (control), wanda ke rage hayaniyar da ke tasowa daga bambancin ƙoshin lafiya tsakanin mutane – fa'ida mai muhimmanci ga ƙananan samfurin.
Lambobi: Nitritin Plasma, Ƙarfi da Lokaci
Sakamakon kimiyya ya tabbatar da cewa nitrate yana aiki. Nitritin plasma — alamar hanyar nitrate‑zuwa‑nitrite — ya ninka bayan shan ruwan beetroot: 575 ± 199 nM a kan placebo 241 ± 125 nM (P < 0.05). Nitrite shine farkon sinadarin nitric oxide, wanda ke da alaƙa da sarrafa jini da ingancin mitochondria.
Sakamakon Gwaji
- Gwajin 4 km: Ƙarfin matsakaici ya tashi daga 279 ± 51 W zuwa 292 ± 44 W. Lokacin ƙarshe ya inganta daga 6.45 ± 0.42 zuwa 6.27 ± 0.35 minti, wato ƙaruwa na kashi 2.8 % (P < 0.05).
- Gwajin 16.1 km: Ƙarfin matsakaici ya tashi daga 233 ± 43 W zuwa 247 ± 44 W. Lokacin ƙarshe ya ragu daga 27.7 ± 2.1 zuwa 26.9 ± 1.8 minti, wato ƙaruwa na kashi 2.7 % (P < 0.01).
Muhimmanci, yawan amfani da iska (VO₂) a lokutan gwaji bai bambanta sosai ba tsakanin yanayi a kowanne sashi na tazarar. Wannan yana nuni da cewa direbobin sun samar da ƙarfi mafi girma tare da amfani da iskar oxygen ɗaya – wato an samu ingantaccen tattalin arzikin tuki.
Me Yasa Wannan Ke Da Muhimmanci?
Binciken da ya gabata ya nuna cewa nitrate a cikin abinci na rage farashin oxygen na motsa jiki mai ƙarfi, kuma yana ƙara juriya ga aikin tsanani. Abin da ba a sani ba shi ne ko waɗannan tasirin a dakin gwaje‑gwaje za su fassara zuwa ƙarin aiki a gasar a zahiri. Wannan bincike ya cike gibin nan ta hanyar amfani da gwajin lokaci inda direba ke saita saurin sa da kansa, wanda ya fi wakiltar gasar fiye da gwajin da ke buƙatar ƙoƙarin kaiwa ga tazara da ba a saba ba.
Binciken ya nuna cewa nitrate ba ya ƙara iyakar tsarin numfashi; maimakon haka, yana sa amfani da makamashi ya fi tasiri. Ga ‘yan wasa, wannan hanya ce mai jan hankali, domin tana nuni da ƙarin aiki tare da ƙananan kashe kudin oxygen.
Abubuwan Aiki Da Za Su Iya Amfani
- Lokaci: Sha ruwan awanni 2.5 kafin gwaji ya dace da ƙaruwar nitritin plasma da aka gani. Masu tuki da ke son maimaita wannan dabarar yakamata su shirya ruwan nesa da farawa, ba a bakin layi ba.
- Matsakaicin Nitrate: An gwada lita 0.5 na ruwan da ke ɗauke da kimanin mmol 6.2 na nitrate. Yawan nitrate na iya bambanta tsakanin kayayyaki, don haka auna nitrate a maimakon ƙimar ruwan shi ne mafi inganci.
- Gwada Da Kanka: Saboda an haɗa matakin saba da dabaru, ‘yan wasa su yi gwaji da wannan tsarin a horo. Lita rabi da awanni 2.5 kafin farawa abu ne mai sauƙi ga mafi yawan mutane, amma amsa na iya bambanta daga mutum zuwa mutum.
- Tsammani Na Gaskiya: Ƙaruwa kusan 3 % ba ta zama tabbatacciya ga kowane direba ba, kuma bambance‑bambancen da ke cikin bayanai na nuna cewa amsoshin mutum‑zuwa‑mutum na iya bambanta.
Ƙuntatawa
Binciken yana da iyakoki a fili. Mutane tara ne kawai suka halarta, don haka ƙarfi na ƙididdiga ya kasance ƙayyadadden, kuma sakamakon na iya rasa inganci a cikin al’umma mai faɗi. Duk mahalarta maza ne a matakin kulob, don haka ba za a ɗauka cewa ya shafi mata, manyan ƙwararru ko masu motsa jiki na nishaɗi ba. Shaidar wasu bincike na nuna cewa manyan ‘yan wasa na iya amsa daban, amma wannan ba a bincika a cikin takardar ba.
Tsarin ma ya kasance na ɗan lokaci: adadi guda ɗaya kafin kowanne gwaji. Ba a ba da bayani game da abin da ke faruwa idan an ci gaba da sha a ranakun da yawa ko makonni ba. A ƙarshe, gwaje‑gwajen sun kasance a 4 km da 16.1 km, don haka ba za a iya faɗaɗa sakamakon zuwa manyan tseren awa‑da‑awa ba tare da ƙarin shaidu ba.
Kammalawa
A cikin wannan gwajin juyawa (crossover) da aka yi ta bazuwar zaɓi, shan lita 0.5 na ruwan beetroot mai nitrate awanni 2.5 kafin tseren ya haɓaka nitritin plasma, ya ƙara ƙarfin matsakaici, kuma ya inganta lokutan gwaji kusan kashi 2.7‑2.8 % a cikin maza masu tsere a kulob, ba tare da wani bambanci mai ma’ana a VO₂ ba. Wannan dabara ce mai araha da alƙawari, amma abin dogaro a nan yana zuwa ne daga ƙananan samfurin da ya takaita ga shan adadi guda ɗaya.
