Effect of suspending exercise training on resting metabolic rate in women

J. L. Herring, P. A. Mole, C. N. Meredith, J. S. Stern

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

We tested the hypothesis that enhanced resting metabolic rate (RMR) in highly trained endurance athletes is an acute effect of prior exercise induced by catecholamines and not serum thyroxine. RMR and energy-regulating hormones were studied in nine highly trained women runners during habitual training (period I), and suspension of training (period II). Data were collected during the follicular phase of two consecutive menstrual cycles, confirmed by serum progesterone and estradiol. Subjects maintained training between the two periods. Total energy intake and diet composition, body weight, and oral temperature did not change from period I to period II (P > 0.05). With suspension of training, urinary epinephrine and norepinephrine excretion dropped (P < 0.022) while serum TSH rose (P = 0.011) and free T4 did not change (P = 0.182). RMR (mean ± SEM) was 274 ± 6.2 and 252 ± 7.8 kJ · h-1 for periods I and II, respectively, with repeated measures ANOVA indicating a drop in RMR occurred with cessation of exercise (P = 0.048). The augmentation of RMR by exercise lasted more than 15 h but less than 39 h post-exercise. The results suggest that the drop in catecholamines may partly explain the lower RMR following suspension of training.

Original languageEnglish (US)
Pages (from-to)59-65
Number of pages7
JournalMedicine and Science in Sports and Exercise
Volume24
Issue number1
StatePublished - 1992

Keywords

  • CATECHOLAMINES
  • DIET
  • ENDURANCE TRAINING
  • THYROID HORMONES

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation

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    Herring, J. L., Mole, P. A., Meredith, C. N., & Stern, J. S. (1992). Effect of suspending exercise training on resting metabolic rate in women. Medicine and Science in Sports and Exercise, 24(1), 59-65.