New UBC research shows you should start a high-intensity exercise regimen only if you’re already relatively fit–you’d be risking injury otherwise.
“Although sprint interval training is very effective at improving performance in trained athletes, our study shows it also produces a high concentration of free radicals,” senior author Robert Boushel told Men’s Journal. “If you’re untrained, this causes oxidative stress and suppresses muscle mitochondria.”
Beginners at exercise training should build up training intensity gradually over several weeks before starting sprint interval training, added Boushel.
