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Appl Physiol Nutr Metab. 2012 Jun;37(3):551-4. Epub 2012 Apr 26.
Bigger weights may not beget bigger muscles: evidence from acute muscle protein synthetic responses after resistance exercise.
Burd NA, Mitchell CJ, Churchward-Venne TA, Phillips SM.
Source
Exercise Metabolism Research Group, Department of Kinesiology, McMaster University, 1280 Main St. West, Hamilton, ON L8S 4K1, Canada.
Abstract
It is often recommended that heavier training intensities (∼70%-80% of maximal strength) be lifted to maximize muscle growth. However, we have reported that intensities as low as 30% of maximum strength, when lifted to volitional fatigue, are equally effective at stimulating muscle protein synthesis rates during resistance exercise recovery. This paper discusses the idea that high-intensity contractions are not the exclusive driver of resistance exercise-induced changes in muscle protein synthesis rates.
http://www.nrcresearchpress.com/doi/pdf/10.1139/h2012-022