ponse, known as immunoassays. Immunoassays are the tests physiologists have traditionally used in such studies. The researchers added a third test, the tibia line rat growth assay, to detect the biological action of the hormones, a novel approach to the study of growth hormones in exercise.

Type of growth hormone varies with exercise

The researchers divided the participants into two groups: an upper body training group and a total body training group. The two groups were then subdivided: Half used heavier weights with fewer repetitions (up to eight) while the other half used lighter weights with a greater number of repetitions (up to 12).

The researchers took blood samples before and after the initial training (acute exercise) session that all participants did as the start of the study. They also obtained blood samples before and after the final training session 24 weeks later (chronic exercise). One of the unique aspects of the study was that it continued over a relatively long time.

The researchers made these findings:

? The presence of growth hormone varied with the training regimen.
? The presence of growth hormone varied with the test used to detect it. This suggests that pituitary function and the release of different sizes of growth hormone is altered with weight training.
? The body can adapt and produce more or less of certain sizes of growth hormone with weight training. In this study, the larger sized growth hormone variants appear to increase with heavy resistance training.

“This study shows that not every form of growth hormone responds in the same way, but is dependent upon the exercise protocol,” Kraemer explained. “This may forever change the way we look at growth hormone in the circulation with exercise and training.”

Source-Newswie
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