Work­ing out on empty stom­ach may be bet­ter

Hindustan Times (Patna) - Live - - Lifestyle - IANS

If you’ve been won­der­ing whether it’s bet­ter to eat or not be­fore a work­out, re­searchers now have an an­swer. A new study has found that ex­er­cise on empty stom­ach is bet­ter for your health in the long term.

The study an­a­lysed ef­fects of eat­ing ver­sus fast­ing on gene ex­pres­sion in adi­pose (fat) tis­sue in re­sponse to ex­er­cise. Af­ter eat­ing, adi­pose tis­sue “is busy re­spond­ing to the meal and a bout of ex­er­cise at this time will not stim­u­late the same (ben­e­fi­cial) changes in adi­pose tis­sue”, ex­plained cor­re­spond­ing au­thor of the study Dy­lan Thomp­son from Univer­sity of Bath in Bri­tain.

“We pro­pose that feed­ing is likely to blunt long-term adi­pose tis­sue adap­ta­tion to reg­u­lar ex­er­cise,” the re­searchers noted in the study, pub­lished in the Amer­i­can Jour­nal of Phys­i­ol­ogy — En­docrinol­ogy and Me­tab­o­lism.

The study par­tic­i­pants were a group of over­weight males who walked for 60 min­utes at 60 per cent max­i­mum oxy­gen con­sump­tion on an empty stom­ach and, on an­other oc­ca­sion, two hours af­ter con­sum­ing a high-calo­rie car­bo­hy­drate-rich break­fast.

The re­search team took blood sam­ples af­ter eat­ing or fast­ing and af­ter ex­er­cis­ing. They also took fat tis­sue sam­ples im­me­di­ately be­fore and one hour af­ter walk­ing.

Gene ex­pres­sion in the fat tis­sue dif­fered sig­nif­i­cantly in the two tri­als. The ex­pres­sion of two genes, PDK4 and HSL, in­creased when the men fasted and ex­er­cised and de­creased when they ate be­fore ex­er­cis­ing. The rise in PDK4 likely in­di­cates that stored fat was used to fuel me­tab­o­lism dur­ing ex­er­cise in­stead of car­bo­hy­drates from the re­cent meal.


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