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1 Department of Pediatrics, University of California, College of Medicine, Irvine, California 92868; and Department of 2 Pediatrics, Oregon Health Sciences University, Portland, Oregon 97201
Anabolic effects of exercise are mediated, in part, by fibroblast growth factor-2 (FGF-2), insulin-like growth factor-I (IGF-I), and growth hormone (GH). To identify local vs. systemic modification of these mediators, 10 male subjects performed 10 min of unilateral wrist-flexion exercise. Blood was sampled from catheters placed in basilic veins of both arms. Lactate was significantly increased only in the exercising arm. FGF-2 decreased dramatically (P < 0.01) in both the resting (from 1.49 ± 0.32 to nadir at 0.11 ± 0.11 pg/ml) and exercising arm (1.80 ± 0.60 to 0.29 ± 0.14 pg/ml). Small but significant increases were found in both the resting and exercising arm for IGF-I and IGF binding protein-3 (IGFBP-3). GH was elevated in blood sampled from both the resting (from 1.04 ± 0.68 to a peak of 2.57 ± 0.53 ng/ml) and exercising arm (1.04 ± 0.66 to 2.43 ± 0.42 ng/ml, P < 0.05). Unilateral wrist exercise was not sufficiently intense to increase circulating lactate or heart rate, but it led to systemic changes in GH, IGF-I, IGFBP-3, and FGF-2. Low-intensity exercise involving small muscle groups can influence the circulating levels of growth factors.
growth factors; training; hypertrophy
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