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Written by Superhuman
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Thursday, 17 January 2008 |
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Guys who go on huge binge workouts without working up to the effort are not getting the benefit they think ...
they are. Radical changes in exercise intensity or duration can have negative effects on anabolic hormones such as IGF-1, which promotes muscle growth and strength. Researchers from the U.S. Army Research Institute of Environmental Medicine in Natick, Massachusetts found decreases in IGF-1 levels in people who increased energy expenditure by 1,000 calories per day through exercise. Consuming more calories or protein had no effect on the decrease in IGF-1. This was an important study for athletes cannot who eat more calories or protein to compensate for large boosts in training volume or intensity. Sudden changes in the exercise program can suppress muscle growth factors that determine gains in muscle mass and strength. Don’t overtrain! (Journal Applied Physiology, in press; published online August 16, 2007)
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