The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
Low energy availability, not stress of exercise, alters LH pulsatility in exercising women
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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“The concept of the LEA threshold (30 kcal/kg FFM/day), below which health problems occurred, was based on elegant but short-term laboratory studies that investigated stepwise changes in EA, perturbations of sex hormones 45 127 128 and changes in markers of bone turnover 125 in a small sample of sedentary females.”
From 2023 international olympic committee's (IOC) consensus statement on relative energy deficiency in sport (REDs) (2023) · cites this paper as [127]
In the citing paper
“Studies of LEA exposure have identified a somewhat more prominent effect of poor EI, rather than excessive EEE, in causing most of the physiological perturbations.127 160”
From 2023 international olympic committee's (IOC) consensus statement on relative energy deficiency in sport (REDs) (2023) · cites this paper as [127]
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“LH pulsatility can be suppressed by a combination of strenuous exercise and caloric restriction [ 1 ].”
BackgroundMethodInfluentialMatzkin, E., & Paci, G. (2014) · Springer eBooks · doi:10.1007/978-1-4471-4712-1_1
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Tingley, S. P. (2005) · doi:10.14288/1.0077037
“However, the time course appears to proceed from decreases in pre-menstrual symptoms, FSH, and LH pulse frequency, as well as an increase in LH pulse amplitude, to inadequate amounts of progesterone secretion, shortened luteal phase length with an increase in follicular phase length, loss of LH surge or anovulation, a…”
BackgroundResultInfluential
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
- Publisher
- American Physiological Society
- 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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