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Impact of Chronic Training on Pituitary Hormone Secretion in Humans

  • Johannes D. VeldhuisEmail author
  • Kohji Yoshida
Chapter
  • 99 Downloads
Part of the Contemporary Endocrinology book series (COE)

Abstract

The impact of chronic training on pituitary function is best understood by a basic appraisal of the neuroendocrine physiology of any given individual axis and the more complex interactive pathophysiology among axes. Interaxes interactions have received relatively little attention. Even evaluating a single neuroendocrine axis in its dynamic state is a complicated challenge, given combined feedforward and feedback activities among the key control loci within any given axis. For example, in the case of the growth hormone (GH) and insulin-like growth factor 1 (IGF-1) axis, hypothalamic GH-releasing hormone (GHRH) secreted by arcuate nuclei stimulates pituitary GH secretion acutely, whereas the somatostatinergic system originating in the paraventricular nuclei opposes GHRH action. These two neuronal inputs are reciprocally interconnected by intrahypothalamic synapses and common impinging neuromodulator pathways. In addition, secreted GH feeds back on brain GH receptors, stimulating somatostatin secretion and possibly inhibiting GHRH release. Available GH secreted into the bloodstream triggers IGF-1 production in various target tissues, and circulating IGF-1 is capable of inhibiting pituitary GH secretion indirectly and directly. Such feedforward (GHRHs driving GH secretion) and feedback (GHs inhibiting its own secretion, IGF-1 s inhibiting GH secretion, and so forth) dynamic control mechanisms in principle can be modified by the effects of exercise at one or more levels within the axis. Moreover, multiple determinants modulate neuroendocrine responses to training, such as the body composition of the individual, concurrent stress and/or weight loss, gender, diet and energy balance, concomitant drug or hormone use, age, puberty, pregnancy, and/or lactational status.

Keywords

Growth hormone Growth hormone secretion Pituitary hormone secretion Stimulate growth hormone secretion Serum growth hormone concentration 

Notes

Acknowledgments

We thank Patsy Craig for her skillful preparation of the manuscript and Paula P. Azimi for the data analysis, management, and graphics. This work was supported in part by NIH Grant MO1 RR00847 (to the General Clinical Research Center of the University of Virginia Health Sciences Center), Research Career Development Award 1-KO4-HD-00634 (to J. D. V.), the Baxter Healthcare Corporation (Round Lake, IL, to J. D. V.), the NIH-supported Clinfo Data Reduction Systems, the University of Virginia Pratt Foundation and Academic Enhancement Program, the National Science Foundation Center for Biological Timing (Grant DIR89-20162), and the NIH NICHD U54 Center for Reproduction Research (HD96008).

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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Endocrine Research UnitMayo ClinicRochesterUSA
  2. 2.Department of Obstetrics and GynecologyUniversity of Occupational and Environmental HealthKitakyushuJapan

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