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Current gym dogma holds that to build muscle size you need to lift heavy weights. However,a new study conducted at McMaster University has shown that a similar degree of muscle building can be achieved by using lighter weights.The secret is to pump iron until you reach muscle fatigue.The findings are published in plos one. "rather than grunting and straining and straining to lift heavy weights, you can grab something much lighter but you have to lift it until you can't lift it anymore," says stuart phillips, associate professor of kinesiology at McMaster University."We're convinced that growing muscle means stimulating your muscle to make new muscle proteins, a process in the body that over time accumulates into bigger muscles." he added.The study showed it is really not the weight that you lift but the fact that you get muscular fatigue that's the criti-cal point in building muscle."we're excited to see where this new paradigm will lead," says phillips, adding that these new data have practical signifi-cance for gym enthusiasta but more importantly for people with compromised skeletal muscle mass,such as the elderly, patients with cancer, orthose who are recovering from trauma, surgery or even stroke.