Sprint Cycling Increases Growth Hormone and IGF-1

Growth hormone and IGF-1 are two important anabolic hormones that increase muscle mass and strength. Growth hormone promotes muscle hypertrophy indirectly by increasing the production of IGF-1. Israeli researchers from the Sackler School of Medicine in Tel Aviv found that growth hormone, IGF-1 and lactate increased during a single 30-second maximal sprint on a stationary bike (i.e., Wingate test). Growth hormone increased more and peaked earlier in women than men, but IGF-1 only increased significantly in men. This was an interesting study, but it has little practical application. (Journal Strength Conditioning Research, 28: 3411-3415, 2014)

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