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Light weights are just as good for building muscle, getting stronger, researchers find
Date:4/30/2012

Lifting less weight more times is just as effective at building muscle as training with heavy weights, a finding by McMaster researchers that turns conventional wisdom on its head.

The key to muscle gain, say the researchers, is working to the point of fatigue.

"We found that loads that were quite heavy and comparatively light were equally effective at inducing muscle growth and promoting strength," says Cam Mitchell, one of the lead authors of the study and a PhD candidate in the Department of Kinesiology.

The research, published in the Journal of Applied Physiology, challenges the widely accepted dogma that training with heavy weightswhich can be lifted only six to 12 times before fatigueis the best avenue to muscle growth.

"Many older adults can have joint problems which would prevent them training with heavy loads," says Mitchell. "This study shows that they have the option of training with lighter and less intimidating loads and can still receive the benefits."

For the study, a series of experiments were conducted on healthy, young male volunteers to measure how their leg muscles reacted to different forms of resistance training over a period of 10 weeks.

The researchers first determined the maximum weight each subject could lift one time in a knee extension. Each subject was assigned to a different training program for each leg.

In all, three different programs were used in combinations that required the volunteers to complete sets of as many repetitions as possible with their assigned loads typically eight to 12 times per set at the heaviest weights and 25-30 times at the lowest weights.

The three programs used in the combinations were:

  • one set at 80% of the maximum load
  • three sets at 80% of the maximum
  • three sets at 30% of the maximum

After 10 weeks of training, three times per week, the heavy and light groups that lifted three s
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Contact: Michelle Donovan
donovam@mcmaster.ca
905-525-9140
McMaster University
Source:Eurekalert

Page: 1 2

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