Cited by 539Hypothalamic control of reproductive hormonesOvarian function and disordersRegulation of Appetite and Obesity

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Low energy availability, not stress of exercise, alters LH pulsatility in exercising women

Loucks, A. B., Verdun, M., Heath, E. M., (With the Technical Assistance of T. Law, Sr. and J. R. Thuma)·1998·Journal of Applied Physiology

Abstract

We tested two hypotheses about the disruption of luteinizing hormone (LH) pulsatility in exercising women by assaying LH in blood samples drawn at 10-min intervals over 24 h from nine young, habitually sedentary, regularly menstruating women on days 8, 9, or 10 of two menstrual cycles after 4 days of intense exercise [E = 30 kcal.kg lean body mass (LBM)-1.day-1 at 70% of aerobic capacity]. To test the hypothesis that LH pulsatility is disrupted by low energy availability, we controlled the subjects' dietary energy intakes (I) to set their energy availabilities (A = I - E) at 45 and 10 kcal.kg LBM-1.day-1 during the two trials. To test the hypothesis that LH pulsatility is disrupted by the stress of exercise, we compared the resulting LH pulsatilities to those previously reported in women with similar controlled energy availability who had not exercised. In the exercising women, low energy availability reduced LH pulse frequency by 10% (P 0.4). During exercise, the proportion of energy derived from carbohydrate oxidation was reduced from 73% while A = 45 kcal.kg LBM-1.day-1 to 49% while A = 10 kcal.kg LBM-1.day-1 (P < 0.0001). These results contradict the hypothesis that LH pulsatility is disrupted by exercise stress and suggest that LH pulsatility in women depends on energy availability.

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Crossref · 10.1152/jappl.1998.84.1.37

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Research works printed but not linked: 27

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Metadata

Authors
Loucks, A. B., Verdun, M., Heath, E. M., & (With the Technical Assistance of T. Law, S. A. J. R. T.
Affiliations
Ohio University (US)
Venue
Journal of Applied Physiology
Published
1998-01-01
Volume
84
Issue
1
Pages
37-46
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2136430560
Cited by
539
References
0
Citations by year
2026: 18 · 2025: 19 · 2024: 20 · 2023: 29 · 2022: 18 · 2021: 32 · 2020: 31 · 2019: 21 · 2018: 17 · 2017: 22 · 2016: 32 · 2015: 6 · 2014: 28 · 2013: 20 · 2012: 10
FWCI
12.66
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (1r55hd029547-01)
  • National Center for Research Resources (M01-RR-00034, M01RR000034)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (1R55-HD-29547-01)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Health Sciences › Medicine › Reproductive Medicine › Ovarian function and disorders
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
luteinizing hormone, LH pulsatility, energy availability, exercise stress, high-intensity exercise, menstrual cycle, LH pulse frequency, LH pulse amplitude, carbohydrate oxidation, caloric restriction, women
MeSH terms
Adolescent, Adult, Blood Glucose, Energy Metabolism, Follicle Stimulating Hormone, Humans, Luteinizing Hormone, Male, Growth Hormone, Stress, Physiological, Exercise

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