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Basal metabolic rate and thyroid hormones of late-middle-aged and older human subjects: the ZENITH study

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Meunier, N, Beattie, JH, Ciarapica, D, O'Connor, JM, Andriollo-Sanchez, M, Taras, A, Coudray, C and Polito, A (2005) Basal metabolic rate and thyroid hormones of late-middle-aged and older human subjects: the ZENITH study. EUROPEAN JOURNAL OF CLINICAL NUTRITION, 59 (Suppl. 2). S53-S57. [Journal article]

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DOI: 10.1038/sj.ejcn.1602299

Abstract

Objective: This paper describes baseline data on basal metabolic rate (BMR), thyroid hormone levels and body composition of middle-aged and older people participating in the ZENITH project and the correlation of thyroid hormone levels with zinc status. Design: A multicentre prospective intervention study employing a randomised double blind design. Setting: Clermont-Ferrand, Theix (France), Coleraine (Northern Ireland), Grenoble (France), Rome (Italy). Interventions: BMR has been measured on a subsample of 70 middle-aged volunteers (35 men and 35 women recruited in Clermont-Ferrand, France, aged 55-70 y) and 108 older volunteers (56 men and 52 women recruited in Rome, Italy, aged 70-85 y). Thyroid hormone levels were evaluated in the entire group of ZENITH volunteers (n = 387). BMR was measured by indirect calorimetry. Fat-free mass (FFM) was derived by four skinfold thicknesses using Durnin and Womersley's equations. Concentrations of thyroid hormones (total T3 and T4) were measured using a competitive immunoassay with an enhanced chemiluminescence end point. Results: Italian older volunteers had a significantly lower FFM than middle-aged French volunteers (-7% P<0.01). A negative correlation between BMR and age (men, r= -0.64; women, r= -0.62; both P<0.0001) was observed: BMR was significantly (P<0.000001) lower in Italian elderly volunteers (4.03 +/- 0.46 kJ/min and 3.29 +/- 0.42 kJ/min for men and women, respectively) than in middle-aged French volunteers (4.84 +/- 0.45 kJ/min and 3.87 +/- 0.38 kJ/min for men and women, respectively), even after adjustment for FFM (-12%). No correlation has been observed between BMR and thyroid hormones both in French and Italian subjects. Total T4 (T-174) concentrations were lowest in middle-aged population (-10%, P<0.0001). A moderate negative correlation has been found with TT4 and red blood cell zinc (r= -0.12, P<0.02, slope -0.026). Conclusions: The results confirm an age-related decline in BMR not entirely explained by body composition or thyroid hormones differences.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Biomedical Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Northern Ireland Centre for Food and Health (NICHE)
ID Code:7184
Deposited By:Professor Jacqueline McCormack
Deposited On:18 Jan 2010 11:34
Last Modified:15 Dec 2011 16:01

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