Changes in the level of growth hormone, insulin like growth factor-1 and insulin like growth factor binding proteine-3 in young males 24 hours after submaximaltraining

Abstract

The study was accomplished as a control study, under the question whether 6-weeks endurance training affects the growth hormone (GH), insulin like growth factor-1 (IGF-1) and the IGF bindings protein-3 (IGFBP-3) levels. Sixty male subjects participated in the study. The subjects were separated into 2 groups as control (n=30; mean age=21,13±1,16 years) and study (n=30; mean age=21,53±1,61 years) randomly, prior to the runtest. Blood samples were drawn before breakfast and analyzed in the laboratory of the medical faculty of Abant Izzet Baysal University concerning GH, IGF-1and IGFBP-3. VO2max was measured in all individuals. The individuals experimental group trained 3 times a week (Monday, Wednesday, and Friday) for 6 weeks, on the other hand the control group had rest/rested for 6 weeks. Trainings included 30-40 minutes submaximal run on the treadmill, per day. After the last session of training, blood samples were drawn from all subjects following day before breakfast, and were analyzed similar to the first measurements. Then, all subjects (experimental and control groups) were subjected to VO2max measurement again. There were no differences within groups and between the groups in GH, IGF-1, IGFBP-3levels before (p>0.05) and after the test (p>0.05). VO2max was found to be significantly higher in the study group compare to controls (p<0.05). We conclude that submaximal training does not affect the production of growth hormones, although it may increase oxygen consumption.