Calgary ultra-marathoner tests mask in 100 kilometre run

A Calgary ultra-marathoner was ultra curious to find out if wearing a mask while running impeded his oxygen intake - curious enough to conduct an ultra-gruelling bit of pandemic research. Dave Proctor ran seven 15 kilometre long loops around the Glenmore Resevoir wearing his mask and taking his blood 02 levels after every lap. “The first couple of laps it was a bit annoying," Proctor said. "I think it does limit the amount of air that comes in, you have to suck a bit more. But after a whil