Abstract
The aim of this study was to determine the associations between cardiovascular health and the waist circumference (WC) and waist-to-height ratio (WHtR). A cross-sectional study was performed recruiting 26701 middle-aged Chinese men. Of the seven ideal cardiovascular health metrics, body mass index (BMI), total cholesterol (TC), blood pressure (BP), and fasting blood glucose (FBG) were found to increase with an elevation of the mean WC and WHtR. The mean WC and WHtR were significantly lower in the subjects with intermediate or ideal cardiovascular health than those with poor or intermediate health. After adjustment for age, the mean WC and WHtR decreased by 1.486 cm and 0.009 per 1-point increase in the cardiovascular health score, and 2.242 cm and 0.013 per 1-point increase in the number of ideal cardiovascular health metrics, respectively. The cardiovascular health score was negatively correlated with the WC (r = −0.387) and WHtR (r = −0.400), while the number of ideal cardiovascular health metrics was negatively associated with the WC (r = −0.384) and WHtR (r = −0.395). The cardiovascular health is correlated negatively with the WC and WHtR, and a stronger correlation existed between the cardiovascular health and WHtR than WC.
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Introduction
Cardiovascular disease has become a global public health concern1. The 2013 Report on Cardiovascular Diseases in China estimates that approximately 290 million people have cardiovascular diseases in China2, and obesity has become a major risk factor leading to the increase in the prevalence of cardiovascular diseases3. Notably, abdominal obesity, which is caused by the accumulation of visceral fat, has been identified as an independent risk factor for obesity-related diseases and death4. The waist circumference (WC) and waist-to-height ratio (WHtR) are not only effective indicators of abdominal obesity, but also more effective parameters predicting risk factors for cardiovascular diseases5,6. Ideal cardiovascular health, which was proposed by the American Heart Association (AHA) in 2010, has been shown to be protective against cardiovascular and cerebrovascular diseases7,8,9,10,11,12. In the current study, we determined the associations between cardiovascular health and the WC and WHtR among middle-aged men in southeastern China to provide evidence for the development of preventive and control strategies for cardiovascular diseases.
Results
Baseline cardiovascular health metrics
A total of 26701 subjects were enrolled in this study, and the subjects at 40–49, 50–59, and 60–64 years of age consisted of 45.4%, 41.2%, and 13.4% of the total study subjects, respectively. The percentages of the seven ideal health metrics were as follows: total cholesterol (TC), 69.0%; fasting blood glucose (FBG), 67.4%; body mass index (BMI), 50.6%; physical activity (PA), 45.9%; smoking status, 40.5%; blood pressure (BP), 22.8%; and salt intake, 15.7%. Of the seven cardiovascular health metrics, BMI, TC, BP, and FBG were shown to increase with elevation of the mean WC and WHtR (all P values < 0.05) (Table 1).
Number of cardiovascular health metrics and the WC and WHtR
There were only 132 subjects (0.5%) with seven ideal health metrics, 595 subjects (2.2%) with 0 ideal health metrics, and 7383 (27.7%), 6126 (22.9%), and 5702 (21.4%) subjects with 3, 4, and 2 ideal health metrics, respectively. The WC and WHtR were shown to have a clear-cut decreasing trend with the increase in the number of ideal cardiovascular health metrics (Table 2).
Ideal cardiovascular health score and the WC and WHtR
The ideal cardiovascular health score predominantly ranged between 7 and 11, and there were 3432 (12.9%), 4470 (16.7%), 4847 (18.2%), 4422 (16.6%), and 2924 (11.0%) subjects with ideal cardiovascular health scores of 7, 8, 9, 10 and 11, respectively. Overall, the WC and WHtR had a remarkable decreasing trend with the increase in ideal cardiovascular health score (Table 3).
Cardiovascular health status and the WC and WHtR
There were 798 (3.0%), 15964 (59.8%), and 9939 (37.2%) subjects with inadequate, average, and optimum cardiovascular health, respectively. The WC and WHtR were significantly lower in the subjects with average cardiovascular health than subjects with inadequate cardiovascular health, while a lower WC and WHtR were found in the subjects with optimum cardiovascular health relative to subjects with average cardiovascular health (Table 4).
Association of cardiovascular health with WC and WHtR
Correlation analyses showed that cardiovascular health score was negatively correlated with the WC (r = −0.387) and WHtR (r = −0.400), and the number of ideal cardiovascular health metrics was negatively associated with the WC (r = −0.384) and WHtR (r = −0.395), while cardiovascular health was also negatively correlated with the WC (r = −0.319) and WHtR (r = −0.330). Stronger associations between the cardiovascular health score, number of ideal cardiovascular health metrics, and cardiovascular health were detected with the WHtR than the WC (Table 5). 10 as the cut-off point of cardiovascular health score, i.e. cardiovascular health score greater than or equal to 10 was defined as ideal cardiovascular health and cardiovascular health score less than 10 was defined as non-ideal cardiovascular health. The result of ROC analysis showed that the area under the curve (AUC) of WC was 0.678 and AUC of WHtR was 0.684.
Discussion
Since ideal cardiovascular health was first proposed and defined by the AHA in 2010, the prevalence of ideal cardiovascular health has been reported worldwide; however, the cardiovascular health metrics and scores vary as a function of country, race, region, economy, and lifestyle8,9,13,14,15,16.
In the current study, we found that 132 of 26701 middle-aged Chinese men (0.5%) exhibited ideal levels of all seven cardiovascular health metrics, and 595 subjects (2.2%) had 0 ideal health metrics. The results of this study validate a low prevalence of ideal cardiovascular health in Chinese adults. The TC (69.0%) and FBG (67.4%) had the highest proportion of ideal levels, while salt intake (15.7%) and BP (22.8%) showed the lowest percentage of ideal levels, which was similar to the previous studies reporting a daily salt intake of >12 g per person in most areas of China17,18. High-salt diet is considered one of the major risk factors for developing hypertension in China, therefore BP control and salt intake reduction are one of the top priorities for the prevention and control of cardiovascular diseases.
Our findings showed that among the seven cardiovascular health metrics, BMI, TC, BP, and FBG correlated positively with WC and WHtR (all P values < 0.05). In addition, the WC and WHtR had a remarkable decreasing trend with an increase in the number of ideal cardiovascular health metrics (both P values < 0.05), and the WC and WHtR were significantly lower in the subjects with intermediate or ideal cardiovascular health than subjects with poor or intermediate health (both P values < 0.05), demonstrating close associations between ideal cardiovascular health, number of ideal cardiovascular health metrics, and cardiovascular health score with the WC and WHtR.
In the current study, both the WC and WHtR exhibited a remarkable decreasing trend with the increase in ideal cardiovascular health score. After adjustment for age, a 1-point increase in the cardiovascular health score was associated with a 1.486 cm reduction in the mean WC and a 0.009 reduction in the mean WHtR, and a 1-point increase in the number of ideal cardiovascular health metrics was associated with a 2.242 cm reduction in the mean WC and a 0.013 reduction in the mean WHtR. Ambar Kulshreshtha, et al., found that individuals with intermediate or ideal cardiovascular health had a significantly lower risk of stroke than those with poor health7. In addition, a 1-point higher cardiovascular health score was associated with an 8% lower risk of stroke (hazard ratio, 0.92; 95% CI, 0.88–0.95)7. It is therefore suggested that the following control strategy should be implemented to reduce the prevalence of cardiovascular diseases: (1) The four cardiovascular health behaviors (smoking, body mass index, physical activity and salt intake) and three health factors (total cholesterol, blood pressure and fasting plasma glucose) should be improved to increase the cardiovascular health score and/or the number of ideal cardiovascular health metrics. (2) WC and/or WHtR should be maintained within the normal range for abdominal obesity control. Although the seven cardiovascular health metrics include BMI, but the WC and/or WHtR are effective parameters in measuring the accumulation of abdominal fat.
Excessive body fat accumulation may lead to an increase in the risk factors for cardiovascular diseases, such as hyperinsulinemia, insulin resistance, hypertension, and blood lipid abnormalities, thereby resulting in the development of cardiovascular diseases19,20. The WC and WHtR are effective parameters for measuring abdominal obesity and predicting the risk factors for cardiovascular diseases5,6; however, the predictive value of the WC versus WHtR remains controversial. It has been widely reported that the WHtR is superior to the WC and BMI in predicting the risk for cardiovascular diseases21,22,23,24,25,26,27,28,29. A follow-up study conducted by Gelber which recruiting 16000 men and 32000 women showed the strongest correlation between the WHtR, one of the parameters measuring obesity, and cardiovascular diseases21. And the results from another 11-year prospective study involving 45,000 women <60 years of age revealed that the WHtR was superior to the WC, and the WC was superior to waist-to-hip-ratio (WHpR) in predicting the risk of stroke22. Lucy and colleagues proposed that the WHtR is a more ideal tool (a 0.5 cut-off value) to predict cardiovascular diseases and diabetes30, while Ashwel et al. reported that the WHtR is superior to the WC and BMI in predicting the risk for cardiovascular diseases29. Mannucci, et al., consider that the WHtR was shown to be superior to the WC and WHpR for predicting hypertension and hyperlipidemia in a United States population31. Most China researches revealed that the WHtR is better than the WC and BMI in predicting blood lipid abnormalities in a Chinese population32,33,34,35. In addition, a recent study conducted in Korea showed that the WHtR is better than the WC, while the WC is better than the BMI in predicting the risk for coronary heart disease, thus suggesting that the WHtR is an indicator measuring abdominal obesity in clinical practice36. It has been widely reported that the WHtR has a satisfactory predictive value, which may be explained by the following reasons. The WC cannot be used to quantify or differentiate visceral fat and subcutaneous fat, and the WC may be affected by many factors, such as gender, height, age, race, region, economy, environment, and lifestyle, while the BMI can only be used to measure total body fat and cannot represent fat distribution, the use of BMI alone may overestimate the risk for developing cardiovascular diseases in the population with a high weight and many muscular tissues37. The WHtR, which comprehensively considers the impact of height and WC, varies little as a function of race, age, and gender, and is relatively stable38. Our findings showed stronger associations between the cardiovascular health score, number of ideal cardiovascular health metrics, and cardiovascular health status with the WHtR than the WC. It is therefore suggested that the WC should be replaced by the WHtR as a simple tool to measure abdominal obesity and predict cardiovascular risk factors in primary health care.
The WC and WHtR cut-offs for measuring adult abdominal obesity has been controversial until now. The AHA recommends a 102 cm WC for men and 88 cm for women39, and the World Health Organization (WHO) and International Diabetes Federation (IDF) recommend a 90 cm WC for men and 80 cm for women in Asian-Pacific populations40, while the Working Group on Obesity in China recommends an 85 cm WC for men and 80 cm for women41. A study by the Japan Society for the Study of Obesity defined an 85 cm WC for men and 90 cm for women, which was similar to the visceral fat mass, and a Korean study reported an 83.2 cm WC for men and 79.7 cm for women42. He and colleagues recommended a 0.5 WHtR in both mainland Chinese men and women32, while a 0.45–0.48 WHtR cut-off was recommended for Taiwanese populations33,34 and a 0.48 cut-off in both men and women living in Hong Kong37. Lucy et al. reported a 0.5 WHtR cut-off in both men and women, and proposed a health initiative that WC does not exceed one-half of the height30. In addition, a recent Korean study defined a 0.5 WHtR in men and 0.52 in women36. Our findings showed that a 90 cm WC and 0.5255 WHtR at a 7 cardiovascular health score, and a 84.79 cm WC and 0.4944 WHtR at a 10 cardiovascular health score, which is similar to previous studies30,32,36. We consider that different regions should develop a reasonable WC and WHtR cut-off point based on the local epidemiological study and an 85 cm WC cut-off and a 0.5 WHtR cut-off may reasonable to Jiangsu resident.
In summary, the results of this study demonstrate that the cardiovascular health score correlates negatively with the WC and WHtR, and a stronger association between the cardiovascular health score was detected with the WHtR than the WC. In addition, the WHtR is of great value in screening populations at high risk for abdominal obesity and cardiovascular diseases and predicting the risk for cardiovascular diseases.
Methods
Subjects
A cross-sectional study was performed. The men between 40 and 64 years of age receiving health examinations in our hospital from 1 January 2014 through 30 June 2015 were recruited, and all recruited subjects resided in the Suzhou, Wuxi, and Changzhou regions of southeastern China. The study exclusion criteria included the following: use of lipid-regulating drugs; a history of myocardial infarction or stroke; severe hepatic or renal insufficiency; or incomplete medical records. A total of 26701 patients met the appropriate criteria.
The study protocol was approved by the Ethics Review Committee of the Taihu Rehabilitation Hospital of Jiangsu Province, and the study was performed in accordance with the principles of the Declaration of Helsinki. Written informed consent was obtained from all participants following a detailed description of the purpose of this study.
Questionnaire survey
Demographic and clinical characteristics were captured using a self-designed questionnaire, including age, residency, profession, smoking status, alcohol consumption, salt consumption, living habits, physical activity status, medical history of chronic diseases (hypertension, diabetes, coronary heart disease, stroke, and other cardiovascular diseases), and medications. The questionnaire was administered by well-trained medical professionals.
Measurement of cardiovascular risk factors
All subjects had measurements of height, weight, waist circumstance (WC), systolic blood pressure (SBP), diastolic blood pressure (DBP), and body mass index (BMI). In addition, all participants fasted for 8–12 h, and 5 mL of venous blood was collected from the cubital vein the following morning. The serum levels of TG, total cholesterol (TC), HDL-C, and LDL-C were determined using the glycerol phosphate oxidase method, the oxidase method, an antibody-based homogeneous assay, and the homogeneous assay on a fully automatically biochemical analyzer (Hitachi 7600; Hitachi, Ltd., Tokyo, Japan), respectively.
Definition of cardiovascular health
Based on the definition of cardiovascular health proposed by the AHA in 201013, vegetable intakes were changed to salt intake in this study. Physical activity was defined as moderate-intensity aerobic exercise, including fast walking, running, bicycle riding, rope skipping, and swimming and the classification criterion of physical activity was adjusted.
In accordance with AHA definitions, 7 CVH metrics were classified into ideal, intermediate, and poor: (1) smoking: ideal (never or quit >1 year), intermediate (quit <1 year), and poor (current); (2) body mass index (BMI): ideal (<25 kg/m2), intermediate (25 to <30 kg/m2), and poor (≥30 kg/m2); (3) physical activity: ideal (physical activity ≥3 times a week, with >30 min each time or physical activity >90 min per week), intermediate (physical activity of <3 times a week, with <30 min each time or ≤ 89 min of physical activity per week), and poor (no extra physical activity except daily life and work activities); (4) salt intake: ideal(<6 g/d), intermediate (6–12 g/d), and poor (>12 g/d) based on responses to questions related to salt preferences; (5) total cholesterol (TC): ideal (untreated and <5.2 mmol/L [200 mg/dL]), intermediate (treated to <5.2 mmol/L or 5.2–6.2 mmol/L), and poor (>6.2 mmol/L [240 mg/dL]); (6) blood pressure (BP): ideal (untreated and <120/<80 mm Hg), intermediate (treated to <120/<80 mm Hg or 120–139/80–89 mm Hg), and poor (≥140/90 mm Hg); and (7) fasting plasma glucose (FPG): ideal (untreated and <5.6 mmol/L [100 mg/dL]), intermediate (treated to <5.6 mmol/L or 5.6–7.0 mmol/L), and poor (≥7.0 mmol/L [125 mg/dL]).
For each subject, the seven cardiovascular health metrics were scored as follows: 0, poor; 1, general; and 2, ideal. The sum of the scores of the seven cardiovascular health metrics was defined as the total cardiovascular health score, and cardiovascular health status was classified according to the total score, as follows: 0–4, inadequate; 5–9, average; and 10–14, optimum14.
Statistics
The WC and WHtR were described as the mean ± standard deviation (SD), while the distribution of ideal cardiovascular health components and number of ideal cardiovascular health metrics were expressed as a number (proportion).
The associations between WC, WHtR and the cardiovascular health score were calculated using Pearson correlation analysis. The associations between WC, WHtR and the number of ideal cardiovascular health metrics, cardiovascular health status were calculated using Spearman correlation analysis. The receiver operating characteristic curve (ROC) was used to compare the predictive value of WC and WHtR in ideal cardiovascular health. All statistical analyses were conducted using SPSS version 16.0 (SPSS, Inc., Chicago, IL, USA), with a two-tailed P-value < 0.05 considered statistically significant.
Additional Information
How to cite this article: Shen, S. et al. Waist-to-height ratio is an effective indicator for comprehensive cardiovascular health. Sci. Rep. 7, 43046; doi: 10.1038/srep43046 (2017).
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Acknowledgements
The research reported in this article was supported by the China’s Ministry of Science and Technology (Grant No.: 2013BAI04B00), the National Natural Science Foundation of China (Grant No.: 81600346), Natural Science Foundation of Jiangsu Province, China (Grant No.: BK20131096, BK20151115), the R & D Fund of Wuxi Municipal Science & Technology Bureau, China (Grant No.: CMB21S1301), and Jiangsu Provincial Commission of Health and Family Planning, China (Grant Nos: BJ13021, BJ14023, Y2015073, BJ15032, BJ15033 and Z201519).
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S.Z.H., S.S.W. and W.L.X. designed research, L.Y., Q.H.J., and L.F. performed experiments, S.S.W. and Q.H.J. analyzed the data, Y.C.J., W.L., S.K.D., Y.W.F., Q.D.C., Y.J.T. and Z.L. provided critical reagents, S.S.W. and Q.H.J. wrote the manuscript.
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Shen, S., Lu, Y., Qi, H. et al. Waist-to-height ratio is an effective indicator for comprehensive cardiovascular health. Sci Rep 7, 43046 (2017). https://doi.org/10.1038/srep43046
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