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The Effect of an Acute Bout of High-Intensity Interval Exercise Compared to Moderate-Intensity or No Exercise on Growth Hormone Secretion in Overweight, Sedentary, Young Women.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	The Effect of an Acute Bout of High-Intensity Interval Exercise Compared to Moderate-Intensity or No Exercise on Growth Hormone Secretion in Overweight, Sedentary, Young Women./
Author:	Deemer, Sarah E.
Description:	1 online resource (217 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:	Dissertation Abstracts International78-10B(E).
Subject:	Endocrinology. -
Online resource:	click for full text (PQDT)
ISBN:	9781369850178

The Effect of an Acute Bout of High-Intensity Interval Exercise Compared to Moderate-Intensity or No Exercise on Growth Hormone Secretion in Overweight, Sedentary, Young Women.
Deemer, Sarah E.

The Effect of an Acute Bout of High-Intensity Interval Exercise Compared to Moderate-Intensity or No Exercise on Growth Hormone Secretion in Overweight, Sedentary, Young Women. - 1 online resource (217 pages)

Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

There is a strong positive relationship between exercise intensity and pulsatile GH release. It has yet to be determined if high-intensity interval exercise (HIE) can influence pulsatile GH secretion, especially overnight, which accounts for the majority of daily GH release. The purpose of this study was to determine if HIE significantly increased GH secretion compared to continuous moderate-intensity exercise (MOD), or no exercise (CON) in young women. Five young, sedentary women (mean +/- SD age: 22.6 +/- 1.3 years; BMI: 27.4 +/- 3.1 kg/m2; body fat: 39.2 +/- 1.7%; VO 2max: 29.4 +/- 5.7 ml/kg/min) were studied on three different occasions during the follicular phase of their menstrual cycle (CON: no exercise; MOD: 30-min of continuous cycling at 50% of peak power determined from the VO 2max test; and HIE: 4 30-s "all-out" sprints with 4.5 min of recovery between each sprint). Each trial was randomly assigned and separated by a minimum of one month. For each visit, participants reported to the lab at 1700 hr, exercised from 1730 -- 1800 hr, and remained in the lab until 0700 hr the following morning. The overnight GH secretory profile of each trial was determined from 10-min sampling of venous blood from 1730 -- 0600 hr (12.5 h) using deconvolution analysis. Deconvolution GH parameters were log transformed prior to statistical analyses. Calculated GH AUC (0 -- 120 min) was significantly greater in HIE (1018.2 +/- 576.1 ng/mL/120 min) than CON (181.7 +/- 138.9 ng/mL/120 min, p = .04), but not MOD (544.7 +/- 160.7 ng/mL/120 min). Total GH secretory rate (ng/mL/12.5 h) was significantly different between CON (1040.3 +/- 242.0) and HIE (1831.2 +/- 873.8, p = .05), but MOD (1429.2 +/- 206.0) was not different from CON (p = .08). For these untrained, overweight, sedentary young women, a single bout of exercise was insufficient to significantly affect overnight pulsatile GH secretion. Aerobic fitness, prior training, as well as several metabolic factors associated with obesity (e.g., increased insulin and circulating free fatty acids), can also influence GH secretion and should be taken into account as potential mediators of the GH response to exercise.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369850178Subjects--Topical Terms:

645497
Endocrinology.
Index Terms--Genre/Form:

554714
Electronic books.

The Effect of an Acute Bout of High-Intensity Interval Exercise Compared to Moderate-Intensity or No Exercise on Growth Hormone Secretion in Overweight, Sedentary, Young Women.
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520 $a There is a strong positive relationship between exercise intensity and pulsatile GH release. It has yet to be determined if high-intensity interval exercise (HIE) can influence pulsatile GH secretion, especially overnight, which accounts for the majority of daily GH release. The purpose of this study was to determine if HIE significantly increased GH secretion compared to continuous moderate-intensity exercise (MOD), or no exercise (CON) in young women. Five young, sedentary women (mean +/- SD age: 22.6 +/- 1.3 years; BMI: 27.4 +/- 3.1 kg/m2; body fat: 39.2 +/- 1.7%; VO 2max: 29.4 +/- 5.7 ml/kg/min) were studied on three different occasions during the follicular phase of their menstrual cycle (CON: no exercise; MOD: 30-min of continuous cycling at 50% of peak power determined from the VO 2max test; and HIE: 4 30-s "all-out" sprints with 4.5 min of recovery between each sprint). Each trial was randomly assigned and separated by a minimum of one month. For each visit, participants reported to the lab at 1700 hr, exercised from 1730 -- 1800 hr, and remained in the lab until 0700 hr the following morning. The overnight GH secretory profile of each trial was determined from 10-min sampling of venous blood from 1730 -- 0600 hr (12.5 h) using deconvolution analysis. Deconvolution GH parameters were log transformed prior to statistical analyses. Calculated GH AUC (0 -- 120 min) was significantly greater in HIE (1018.2 +/- 576.1 ng/mL/120 min) than CON (181.7 +/- 138.9 ng/mL/120 min, p = .04), but not MOD (544.7 +/- 160.7 ng/mL/120 min). Total GH secretory rate (ng/mL/12.5 h) was significantly different between CON (1040.3 +/- 242.0) and HIE (1831.2 +/- 873.8, p = .05), but MOD (1429.2 +/- 206.0) was not different from CON (p = .08). For these untrained, overweight, sedentary young women, a single bout of exercise was insufficient to significantly affect overnight pulsatile GH secretion. Aerobic fitness, prior training, as well as several metabolic factors associated with obesity (e.g., increased insulin and circulating free fatty acids), can also influence GH secretion and should be taken into account as potential mediators of the GH response to exercise.
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