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Variability of adiposity indices and incident heart failure among adults with type 2 diabetes

Abstract

Background

It remains unclear how the variability of adiposity indices relates to incident HF. This study evaluated the associations of the variability in several adiposity indices with incident heart failure (HF) in individuals with type 2 diabetes (T2DM).

Methods

We included 4073 participants from the Look AHEAD (Action for Health in Diabetes) study. We assessed variability of body mass index (BMI), waist circumference (WC), and body weight across four annual visits using three variability metrics, the variability independent of the mean (VIM), coefficient of variation (CV), and intraindividual standard deviation (SD). Multivariable Cox regression models were used to generate adjusted hazard ratios (aHR) and 95% confidence intervals (CI) for incident HF.

Results

Over a median of 6.7 years, 120 participants developed incident HF. After adjusting for relevant confounders including baseline adiposity levels, the aHR for the highest (Q4) versus lowest quartile (Q1) of VIM of BMI was 3.61 (95% CI 1.91–6.80). The corresponding aHRs for CV and SD of BMI were 2.48 (95% CI 1.36–4.53) and 2.88 (1.52–5.46), respectively. Regarding WC variability, the equivalent aHRs were 1.90 (95% CI 1.11–3.26), 1.79 (95% CI 1.07–3.01), and 1.73 (1.01–2.95) for Q4 versus Q1 of VIM, CV and SD of WC, respectively.

Conclusions

In a large sample of adults with T2DM, a greater variability of adiposity indices was associated with higher risks of incident HF, independently of traditional risk factors and baseline adiposity levels.

Registration-URL: https://clinicaltrials.gov/ct2/show/NCT00000620.

Background

Type 2 diabetes (T2DM), obesity and heart failure (HF) remain major public health problems across the USA [1,2,3]. The interplay between these 3 entities is complex; with obesity increasing the risk of HF, and individuals with mild to moderate obesity having a better survival profile compared to those at the extreme adiposity levels [4]. About 12% or more people with diabetes mellitus will develop diabetes-related cardiac dysfunction, which may ultimately lead to overt HF and death [5, 6]. Diabetes-related cardiac dysfunction is thought to occur independently of coronary artery disease (CAD), hypertension, or valvular heart disease. Numerous pathways linking diabetes to cardiac remodeling have been described, and include among others the increased formation of advanced glycation end-products (AGEs), hyperinsulinemia, oxidative stress, autonomic dysfunction and low-grade inflammation [5,6,7]. The role of inflammation in the pathophysiology of diabetes-related cardiomyopathy is illustrated by evidence of higher plasma concentrations of pro-inflammatory proteomic markers among patients with diabetes-related HF [7].

Major professional organizations recommend the use of weight loss strategies in the management of overweight and obese individuals including those with T2DM [8, 9]. However, weight loss attempts frequently lead to weight cycling, characterized by major fluctuations in body weight [10]. There is accruing evidence that body weight fluctuations are associated with increased risks of atherosclerotic cardiovascular disease (ASCVD) and deaths [11,12,13,14,15]; however, most studies have not explored the relation with incident HF, especially among people with T2DM. Additionally, to our knowledge, the association of variability in waist circumference (WC) with incident HF has never been assessed in T2DM.

Using data from the Look AHEAD (Action for Health in Diabetes) study—a large cohort of adults with T2DM, we evaluated the associations of the variability in adiposity indices (body mass index [BMI], WC, and body weight) with incident HF events. Given the extant evidence on the variability of body composition indices and cardiovascular outcomes other than HF among individuals with diabetes [11,12,13,14,15], as well as the link between glycemic and blood pressure (BP) variability and diabetes-related HF [16, 17], we therefore hypothesized that a higher variability of body composition indices would be related to a heightened risk of incident HF.

Methods

Study design

We performed a secondary and prospective cohort analysis of the Look AHEAD study, details of which have previously been published [18]. Briefly, Look AHEAD was a randomized clinical trial in which 5145 overweight or obese adults with T2DM aged 45 to 76 years were recruited from August 2001 to April 2004 across 16 centers in the USA and randomly assigned to receive either an intensive lifestyle intervention (ILI) or diabetes support and education (DSE). For the current analysis, we included participants with full data on body mass index (BMI) and waist circumference (WC) at the baseline, 12-month, 24-month, and 36-month visits. Participants with history of prevalent HF, those who developed HF or died during the initial 36-months (body weight variability assessment period) were excluded (n = 828); this was done in order to ensure that the exposure measurement preceded the development of the outcome. We also excluded participants in the Look AHEAD who had consent restrictions (n = 244). A total of 4073 participants were included in our final analyses. Additional file 1: Fig S1 summarizes the study exclusion process.

The research protocol was reviewed and approved by the Institutional Review Board at each participating clinical center and informed consent was obtained from each participant [18].

Assessment of variability in adiposity indices

The variability of adiposity indices was assessed during the first 36-months of follow-up in Look AHEAD (Additional file 1: Fig S1). For each participant, height and weight were measured at each visit twice using a stadiometer and digital scale, respectively; the average of the measurements was calculated and used for the analyses. BMI was computed as weight in kilograms divided by the square of height in meters. Waist circumference (WC) was measured using a non-metallic, constant tension tape placed at midlevel between the highest point of the iliac crest and lowest point of the costal border on the mid-axillary line [18].

For each adiposity index (BMI, WC or body weight), variability was defined by three metrics: the intraindividual standard deviation (SD), the coefficient of variation (CV) calculated as 100*SD/mean, and the variability independent of the mean (VIM) calculated as 100*SD/meanβ where β represents the regression coefficient based on the natural logarithm of SD on the natural logarithm of the obesity measure’s mean [19].

Ascertainment of incident heart failure events

Participants were followed from the end of the variability assessment period (36-month visit) through the occurrence of a HF event, death, or end of the study. Semiannual telephone calls and annual visits were conducted. Incident HF events were ascertained by an adjudication committee after reviewing relevant medical records using criteria adapted from the Women’s Health Initiative [20]. Potential cases were grouped into definite or possible acute decompensated HF, chronic stable HF, HF unlikely, or unclassifiable. Incident HF referred to the first hospitalization for definite or possible acute HF exacerbation [21]. Further details about the ascertainment of HF events are provided in Additional file 1: Method S1.

Covariates

The covariates assessed at baseline include: age, sex, race/ethnicity, randomization arm, duration of diabetes, history of prevalent ASCVD (history of coronary artery disease or stroke at baseline), current smoking, alcohol use, and estimated glomerular filtration rate (eGFR) calculated using the Chronic Kidney Disease Epidemiology Collaboration equation [22]. Additionally, we assessed variables collected during the variability assessment period which include average systolic blood pressure, use of antihypertensive medication, average ratio of total to high-density lipoprotein (HDL) cholesterol, average glycosylated hemoglobin (HbA1C) as well as average BMI, WC, and body weight [18]. We also evaluated the variability of other physiologic parameters including SD of blood pressure, heart rate and HbA1C.

Statistical analyses

We compared the characteristics of the participants across quartiles of the VIM of BMI using the χ2 test for categorical variables, and the Analysis of Variance or Kruskal–Wallis test for continuous variables.

Incidence rates were calculated as the ratio of the cumulative number of HF events to the total person-years. Person-years were calculated from the end of the variability assessment period to the earliest of HF event, death, or September 14, 2012 (date of trial’s termination).

We used Cox proportional hazards regression models to compute adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) for incident HF. Each adiposity variability index was modelled both as a continuous variable and quartiles using the lowest quartile as reference group.

We built sequential regression models as follows: (1) a first model adjusting for age, sex, race/ethnicity, randomization arm (model 1); (2) a second model adjusted for model 1 variables plus additional adjustment for current smoking, alcohol drinking, use of antihypertensive medication, average systolic blood pressure, average ratio of total to high-density lipoprotein cholesterol, estimated glomerular filtration rate, duration of diabetes, average HbA1C, and history of cardiovascular disease (model 2). When variability was assessed using SD or CV, a third model (Model 3) was constructed as model 2 variables with further adjustment for average BMI (when assessing BMI variability), average WC (when evaluating WC variability) or average body weight (when assessing the variability of body weight). In supplementary analyses, we further adjusted for CAD as a time-varying covariate.

In order the assess the effects of the variability in other physiologic variables, we conducted sensitivity analyses adjusting for SD of SBP, heart rate and HbA1C.

A two-sided P-value of less than 0.05 was considered statistically significant and all analyses were conducted using STATA 14.2 (Stata, Inc, College Station, TX).

Results

Characteristics of study participants

The characteristics of participants by quartiles of VIM of BMI are shown in Table 1. Compared to participants in the lowest quartile, those in the highest quartile were younger, more frequently women and more frequently white (and less frequently black). Additionally, participants in the highest quartile had lower HbA1C, total-to-HDL cholesterol ratio, average blood pressure measurements and a lower prevalence of ASCVD at baseline. The proportion of participants in the ILI arm increased across increasing quartiles of BMI variability.

Table 1 Characteristics of Study Participants by Quartiles of BMI Variability in the Look AHEAD Study

Over a median follow-up period of 6.7 years (interquartile range 6.0–7.4), 120 participants developed incident HF events (IR per 1000 person-years: 4.6 [95% CI 3.8–5.4]).

Variability of Body Mass Index

The adjusted HRs of incident HF by BMI variability metrics, evaluated as continuous measures and quartiles, are shown in Table 2. After multivariable adjustment, the HRs for incident HF per unit-SD of the VIM, CV, and SD were 1.21 (95% CI 1.02–1.45), 1.20 (95% CI 1.00–1.44), and 1.16 (95% CI 0.97–1.38) respectively.

Table 2 Hazard ratios for incident heart failure by variability of BMI in the look AHEAD study

Participants in the top quartile of VIM of BMI had a 3.6-fold higher relative risk of incident HF compared to those in the bottom quartile (HR 3.61, 95% CI 1.91–6.80). The corresponding HRs relating incident HF to the CV, and SD of BMI were 2.48 (95% CI 1.36–4.53), and 2.88 (95% CI 1.52–5.46), respectively.

Variability of waist circumference

The adjusted HRs for incident HF per SD increment in VIM, CV, and SD of WC were 1.24 (95% CI 1.08–1.42), 1.22 (95% CI 1.05–1.42), and 1.18 (95% CI 1.04–1.35), respectively (Table 3). The adjusted HRs for the highest compared to the lowest quartiles were 1.90 (95% CI 1.11–3.26), 1.79 (95% CI 1.07–3.01), 1.73 (95% CI 1.01–2.95) for VIM, CV, and SD, respectively (Table 3).

Table 3 Hazard ratios for incident heart failure by variability of waist circumference in the look AHEAD study

Variability of body weight

Each unit-SD increase in VIM of body weight was associated with higher risks of incident HF (HR 1.22, 95% CI 1.02–1.45, Additional file 1: Table S1). Participants in the top quartile of VIM of body weight had a higher risk of incident HF compared to those in the bottom quartile (HR 2.79, 95% CI 1.50–5.19). The HRs for the top compared to the bottom quartiles were 2.52 (95% CI 1.38–4.62), and 2.00 (95% CI 1.09–3.66) for CV and SD of body weight, respectively (Additional file 1: Table S1).

Additional analyses

In additional analyses, we performed further adjustments for CAD modelled as a time-varying covariate. These did not materially affect the magnitude or significance of the results (Additional file 1: Tables S2, S3 & S4). Moreover, we tested for the VIM of BMI by various prespecified subgroups statistical interactions. We did not observe any interaction with age (P for interaction = 0.947), sex (P for interaction = 0.533), and randomization arm (P for interaction = 0.402).

In order to evaluate the effects of the variability in other physiologic variables, we conducted sensitivity analyses accounting for SD of SBP, heart rate and HbA1C. The magnitude and significance of our findings remained essentially unchanged (Additional file 1: Table S5).

Discussion

We conducted a comprehensive evaluation of the associations between variability of adiposity indices and incident HF in a large sample of adults with T2DM. We found that variability of BMI, WC and body weight were each independently associated with an increased risk of incident HF, after adjusting for other known HF risk factors including baseline adiposity levels. Our results were consistent across several variability metrics and were independent of incident CAD. Our findings underscore the importance of minimizing weight fluctuations during weight loss attempts among overweight or obese patients with T2DM.

Our study is unique in several ways including its assessment of the variability of waist circumference as prior studies typically focused on BMI, a measure of global obesity which does not capture the distribution of adiposity in the body [12,13,14, 23, 24]. Additionally, this study complements the available body of evidence by focusing on the effect of adiposity indices’ variability on incident HF in individuals with T2DM. The limited number of studies on this topic focused on atherosclerotic cardiovascular outcomes [12,13,14, 24]. The positive association between body weight variability and HF observed in this study is consistent with prior reports which found that body weight variability was positively associated with CVD events and deaths [12,13,14, 24, 25].

While the pathways relating body weight variability to a higher risk of HF in T2DM are not entirely known, possible hypotheses include the hypertrophy of adipose tissue resulting from metabolic shifts that follow weight cycling [26]. Furthermore, body weight fluctuations are positively associated with greater incidence of the metabolic syndrome components which might in turn augment the risk of HF [25, 27, 28]. Another possible mechanism is via the effect of low-grade inflammation as documented by higher concentrations of plasma C-reactive protein and the increased number of CD4 and CD8 T lymphocytes with increased production of cytokines in those who have higher degree of weight cycling [29, 30].

The public health and research implications of our findings are manifold for people with T2DM. The prevention of body weight fluctuations during weight loss attempts should be a priority and may help reduce the high burden of HF hospitalizations in people with T2DM on the healthcare system. Moreover, further studies are needed to explore the pathways linking body weight variability to HF.

Our study has several strengths. First, we evaluated a vast array of adiposity measures, including WC variability, which was not always included in prior studies. Second, our study includes a large and racially diverse sample of individuals with T2DM, with a standardized assessment of anthropometric measures at regular predetermined intervals (thus allowing the variability assessment), a blinded adjudication of outcomes, a long duration of follow-up, and the consistency of the observed associations with the risk of HF across measures of variability.

Our results should be interpreted in the context of a few limitations. First, we relied only on four timepoints to measure variability; thus, we may have underestimated variability, as previously suggested by data from the blood pressure variability literature [31]. Second, our analysis was observational; therefore, we cannot establish causal association between adiposity variability and HF, and residual confounding may exist. Additionally, we did not have data on the frequency (prevalence and incidence) of malignancies, which may affect weight cycling. Hence, we could not account for the presence of malignancies in our analyses. Third, we did not have data on left ventricular ejection fraction, which would have allowed the identification of HF subtypes. Thus, we could not assess the associations between variability in adiposity indices and the risk of incident HF with reduced ejection fraction and HF with preserved ejection fraction. Fourth, we did not have data on physical activity and dietary intake collected on the entire cohort of Look AHEAD participants; hence we could not evaluate the interplay between those variables, variability in adiposity indices, and incident HF.

Conclusions

In summary, in a large sample of adults with T2DM, a greater variability of BMI, waist circumference, and body weight was associated with higher risk of incident HF, above and beyond baseline adiposity levels. Our findings underscore the need to avoid excessive weight fluctuations during weight loss attempts in this high-risk population.

Availability of data and materials

The data that support the findings of this study are available from the NIDDK Central Repositories, but restrictions apply to the availability of these data. Authors’ Note: (1) The Look AHEAD study was conducted by the Look AHEAD Investigators and supported by the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). The data from the Look AHEAD reported here were supplied by the NIDDK Central Repositories. This manuscript was not prepared in collaboration with Investigators of the Look AHEAD study and does not necessarily reflect the opinions or views of the Look Ahead Study, the NIDDK Central Repositories, or the NIDDK. (2) Look AHEAD was conducted by the Look AHEAD Research Group and supported by the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK); the National Heart, Lung, and Blood Institute (NHLBI); the National Institute of Nursing Research (NINR); the National Institute of Minority Health and Health Disparities (NIMHD); the Office of Research on Women's Health (ORWH); and the Centers for Disease Control and Prevention (CDC). The data (and samples) from Look AHEAD were supplied by the NIDDK Central Repositories. This manuscript was not prepared under the auspices of the Look AHEAD and does not represent analyses or conclusions of the Look AHEAD Research Group, the NIDDK Central Repositories, or the NIH.

Abbreviations

AHEAD:

Action for Health in Diabetes

ASCVD:

Atherosclerotic cardiovascular disease

BP:

Blood pressure

BMI:

Body mass index

CAD:

Coronary artery disease

CI:

Confidence interval

CVD:

Cardiovascular disease

DSE:

Diabetes support and education

eGFR:

Estimated glomerular filtration rate

HbA1C :

Hemoglobin A1C

HDL:

High-density lipoprotein

HF:

Heart failure

HR:

Hazard ratio

ILI:

Intensive lifestyle intervention

NIDDK:

National Institute of Diabetes and Digestive and Kidney Diseases

IR:

Incidence rate

WC:

Waist circumference

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Acknowledgements

The authors thank all the staff and participants of the Look AHEAD study.

Funding

Dr. Echouffo Tcheugui was supported by NIH/NHLBI grant K23 HL153774.

Author information

Authors and Affiliations

Authors

Contributions

ADK and JBE conceived and designed the study. JBE contributed to the acquisition of data. ADK performed the statistical analyses. ADK, SE, PS, AGB, RSA, GCF, and JBE contributed to the interpretation of data. ADK and JBE drafted the manuscript. ADK, SE, PS, AGB, RSA, GCF, and JBE revised the manuscript critically for essential intellectual content. All authors read and approved the final version of the manuscript.

Corresponding author

Correspondence to Justin B. Echouffo-Tcheugui.

Ethics declarations

Ethics approval and consent to participate

The Look AHEAD study was conducted in accordance with the principles of the Helsinki declaration. All participants provided written informed consent and the study protocol was approved by a review panel at the National Institute of Diabetes and Digestive and Kidney Disease (NCT00017953).

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Supplementary Information

Additional file 1: Fig S1

. Study design. Table S1. Hazard Ratios for Incident Heart Failure by Variability of Body Weight in the Look AHEAD Study. Table S2. Hazard Ratios for Incident Heart Failure by Variability of BMI in the Look AHEAD Study. Table S3. Hazard Ratios for Incident Heart Failure by Variability of Waist Circumference in the Look AHEAD Study. Table S4. Hazard Ratios for Incident Heart Failure by Variability of Body Weight in the Look AHEAD Study. Table S5. Hazard Ratios for Incident Heart Failure after additional adjustments for Variability in Other physiologic parameters.

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Kaze, A.D., Erqou, S., Santhanam, P. et al. Variability of adiposity indices and incident heart failure among adults with type 2 diabetes. Cardiovasc Diabetol 21, 16 (2022). https://doi.org/10.1186/s12933-021-01440-1

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Keywords

  • Cardiovascular disease
  • Obesity
  • Diabetes, type 2
  • Epidemiology
  • Heart failure