Work Out Colder

SHAPE (USA) - - Contents - —Mara San­tilli

This fit­ness trend tar­gets body fat in a new way

At Br­rrn stu­dio in New York City, ex­er­cis­ers go for goose bumps, rather than drip­ping sweat, in su­per­chilled 45- to 60-de­gree classes. There’s a good rea­son the room feels a bit like a meat locker, says co­founder Johnny Adamic: “Cooler temps have a real im­pact on your body fat.” At just be­low 65 de­grees, the body be­gins to turn reg­u­lar fat into calo­rie-burn­ing “brown” fat, says Philip Kern, M.D., of the Univer­sity of Ken­tucky. His re­search found that sub­jects had more than dou­ble the brown-fat pro­teins in winter than in sum­mer. It ’s un­clear how long the big­ger burn lasts af­ter a chilly blast, but pro­longed cold ex­po­sure helps ac­ti­vate brown fat more fre­quently over time, Dr. Kern says. If you can’t get to Br­rrn, just set the AC to sub-60 to com­pen­sate for the ex­tra body heat you gen­er­ate ex­er­cis­ing, or head out­side when the temp drops.

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