The presentation of metabolic dysfunction and the relationship with energy output in breast cancer survivors: a cross-sectional study

Nutrition Journal

Juliette Hussey¹  M John Kennedy³  Elizabeth M Connolly²  Emer M Guinan¹ 

[1] Discipline of Physiotherapy, School of Medicine, Trinity Centre for Health Sciences, St. James’s Hospital, Dublin 8, Ireland;Department of Surgery, St. James’s Hospital, Dublin, Ireland;Academic Unit of Clinical and Medical Oncology, St. James’s Hospital and Trinity College, Dublin, Ireland

关键词: Prognosis;    Physical activity;    Resting metabolic rate;    Metabolic syndrome;    Insulin resistance;    Breast cancer;   

Others  :  806222
DOI  :  10.1186/1475-2891-12-99

 received in 2013-01-16, accepted in 2013-07-05,  发布年份 2013

【 摘 要 】

Background

Breast cancer prognosis can be adversely influenced by obesity, physical inactivity and metabolic dysfunction. Interventions aimed at improving surrogate markers of breast cancer risk such as insulin resistance may result in improved breast cancer outcomes. The design of such interventions may be improved through increased understanding of metabolic presentation in this cohort. This cross-sectional study aimed to characterise the metabolic profile of breast cancer survivors relative to abdominal obesity and insulin resistance. A secondary aim was to compare measures of energy output across these groups.

Methods

Sixty-nine women (mean (SD) age 53.43 (9.39) years) who had completed adjuvant chemotherapy and radiotherapy for breast cancer were recruited. All measures were completed during one assessment conducted 3.1 (1.0) years post diagnosis. Body composition was measured by bioimpedance analysis and waist circumference (WC). Fasting (12 hour) blood samples were drawn to measure lipid profile, glucose, insulin, glycosylated haemoglobin A1c (HBA1c) and C-reactive protein (CRP). Insulin resistance was estimated by the homeostatic model assessment index (HOMA-IR)). Energy output was evaluated by resting metabolic rate (RMR) measured by indirect calorimetry and physical activity measured by accelerometry. Characteristics were compared across four groups (1. WC <80 cm, not insulin resistant; 2. WC 80–87.9 cm, not insulin resistant; 3. WC >88 cm, not insulin resistant; 4. WC >80 cm, insulin resistant) using ANOVA (p < 0.05).

Results

Group 4 was characterised by significant disturbances in measures of glucose metabolism (glucose, insulin, HOMA-IR and HBA1c) and raised CRP compared to other groups. Group 4 also displayed evidence of dyslipidemia and higher body composition values compared to Groups 1 and 2. Both absolute and adjusted RMR were significantly higher in the Group 4 versus all other groups. Physical activity levels were similar for all groups.

Conclusions

The results from this study suggest that participants who were both centrally obese and insulin resistant showed evidence of dyslipidemia, low-grade inflammation and glucose dysregulation. Metabolic profiles of participants who were centrally obese only were not significantly different from lean participants. Consideration of baseline metabolic presentation may be useful when considering the therapeutic targets for future interventions in this cohort.

【 授权许可】

   
2013 Guinan et al.; licensee BioMed Central Ltd.

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