Leptin levels and luteinizing hormone pulsatility in normal cycling women and their relationship to daily changes in metabolic rate.

Published

Journal Article

OBJECTIVE: To determine whether leptin and LH secretion in normal women is related to changes in metabolic rate. SETTING: Academic medical center. PATIENT(S) AND DESIGN: Ten young women with normal weight and menses were studied during the early follicular phase. Leptin and LH levels were sampled every 15 minutes over a 24-hour period. Metabolic rate was frequently sampled using indirect calorimetry. Luteinizing hormone pulsatility was analyzed using a Cluster Program analysis. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Leptin, LH, and metabolic rate levels. RESULT(S): All subjects demonstrated a diurnal leptin curve. Luteinizing hormone pulses were increased in amplitude and slower after the leptin peak. The average (+/-SE) number of LH pulses per 6 hours slowed from 4.30 +/- 0.42 to 3.00 +/- 0.42 pulses after the leptin peak, whereas pulse amplitude increased from 1.64 +/- 0.26 to 2.51 +/- 0.42 mIU/mL after the leptin peak. The LH interpulse interval increased from 85.1 +/- 3.64 minutes to 108.8 +/- 10.26 minutes after the leptin peak. Metabolic rate began to drop approximately 4-6 hours before leptin levels peaked, going from 1.66 +/- 0.24 to 1.15 +/- 0.04 kcal/min after the leptin peak. CONCLUSION(S): There is a significant association between the timing of the leptin peak, the nightly slowing of LH pulses, and the fall in metabolic rate, suggesting a metabolic cycle in normal individuals.

Full Text

Duke Authors

Cited Authors

  • Fenichel, RM; Dominguez, JE; Mayer, L; Walsh, BT; Boozer, C; Warren, MP

Published Date

  • October 2008

Published In

Volume / Issue

  • 90 / 4

Start / End Page

  • 1161 - 1168

PubMed ID

  • 18304548

Pubmed Central ID

  • 18304548

Electronic International Standard Serial Number (EISSN)

  • 1556-5653

Digital Object Identifier (DOI)

  • 10.1016/j.fertnstert.2007.07.1350

Language

  • eng

Conference Location

  • United States