May 04, 2012 2:38 PM GMT
Is apparently ok...
“Our hypothesis had been that we would see a greater response to each exercise individually,” says Stuart Phillips, a professor of kinesiology at McMaster who oversaw the Canadian study. Specifically, he says, the scientists had expected that endurance training on its own would significantly affect portions of the muscle cell related to energy production, while resistance training would increase protein synthesis within muscles, the first step toward enlarging the muscles.
Combined training, the Canadian scientists had hypothesized, would dampen at least one of the molecular changes; physiologically, one of the responses would predominate and interfere with the other.
That didn’t happen.
Instead, after combined training, the men’s muscles displayed the same amount of change within both cellular pathways as after either type of exercise on its own, even though the men had actually completed only half as much of each.
“We saw no indications of interference,” says Dr. Phillips, whose study was published last month in The Journal of Applied Physiology.
The Swedish investigators arrived at a similar result. Their study, published in March in Medicine & Science in Sports & Exercise, showed little difference in the genetic and biomechanical responses within muscles whether the men performed both aerobic and resistance training or aerobic training alone.
In other words, “aerobic exercise can precede resistance exercise on the same day without compromising” muscle building, the scientists conclude.
And if you prefer your weight training first, the Canadian study scheduled the resistance work before the bike riding, without compromising the results for either type of exercise.