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The relationship between clustering health-promoting components of lifestyle and bone status among middle-aged women in a general population

Environmental Health and Preventive Medicine volume 14, pages 292–298 (2009)Cite this article

Abstract

Objective

The association between clustering health-promoting components of lifestyle and bone status was examined among middle-aged women.

Methods

A cross-sectional study was conducted in Tadami Town, Fukushima Prefecture, Japan, in 2007. A total of 305 middle-aged women (mean age 55.2 years) participated. The Health-Promoting Lifestyle Profile II was used to assess health-promoting components of lifestyle. Participants’ bone status was examined using quantitative ultrasonic calcaneal measurement.

Results

A total of 139 participants (45.6%) were defined as having low bone stiffness. In the low bone stiffness group, the mean age was significantly higher, and prevalence of interpersonal relationships score over 3.0 was lower than that in the normal bone stiffness group. There were significant trends in the prevalence of low bone stiffness, each health-promoting component of lifestyle, and presence of hypertension and diabetes mellitus, based on the number of frequently selected health-promoting components of lifestyle. The number of frequently selected health-promoting components of lifestyle correlated negatively with the prevalence of low bone stiffness in both crude and adjusted results.

Conclusion

This research is particularly important as we suggest health-promotion strategies for the prevention of osteoporosis. A synthetic approach, which includes health responsibility, spiritual growth, interpersonal relations, and stress management, and physical activity and nutrition, may be effective and complement traditional strategies.

Introduction

Osteoporosis is defined as a skeletal disorder characterized by compromised bone strength predisposing to an increased risk of fracture [1]. According to the World Health Organization, osteoporosis affects more than 75 million individuals in Europe, Japan, and the USA, causing more than 2.3 million fractures annually in Europe and the USA alone [2]. Osteoporotic fractures cause loss of independence and reduce quality of life (QOL) with aging [3]. In 2005, it was estimated that 19.9% of Japanese individuals were over 65 years of age; this proportion is projected to increase to 26.0% in 2015 and 35.7% in 2050 [4]. This trend is observed worldwide, with increasing importance being attached to prevention of osteoporosis in order to improve well-being and longevity. Because osteoporosis is asymptomatic until a fracture occurs, primary prevention is one of the most important strategies.

Low bone mineral density (BMD) is one of the risk factors for osteoporotic fractures in middle-aged women [5], and accelerated bone loss is observed in this age group with decreasing estrogen secretion [6]. Thus, middle-aged women are one of the most important target groups for primary prevention. There are also many lifestyle-related risk factors for bone loss: sedentary behavior and low levels of physical activity [7], low dietary calcium and vitamin D intake [8], less than optimal body weight for health [9], use of tobacco products [10], and excess consumption of alcohol [11]. These risk factors and behaviors have been well studied. However, the relationships between bone status and a health-promoting lifestyle are not well understood.

A health-promoting lifestyle, which is defined as a “multidimensional pattern of self-initiated actions and perceptions that serve to maintain or enhance the level of wellness, self-actualization, and fulfillment of the individual” [12], is measured by the Health-Promoting Lifestyle Profile II (HPLP II) [13]. This instrument consists of six components (health responsibility, spiritual growth, physical activity, interpersonal relations, nutrition, and stress management), and describes lifestyle patterns. Previous studies have emphasized the importance of lifestyle patterns in establishing effective interventions [14, 15]. Moreover, other studies have shown that health behaviors, some of which are health-promoting components of lifestyle, tend to cluster in the same individuals [16, 17]. Furthermore, the impact of clustering health behaviors on risk of cardiovascular disease has been well documented [18]. However, the relationship between bone status and clustering health-promoting components of lifestyle is not well known. Exploring this relationship may therefore suggest additional lifestyle-based health-promotion strategies for prevention of osteoporosis.

In this study, the relationship between health-promoting components of lifestyle and bone status was examined in middle-aged women in the general population in order to explore additional strategies for the prevention of osteoporosis.

Materials and methods

Study design and subjects

A cross-sectional study was conducted in July 2007 in Tadami Town, Fukushima Prefecture, Japan. The total population of this town was 5,402, and the proportion of people aged over 65 years was about 40% in 2007. Annual health check-ups were held in Tadami Town in 2007, and 1,893 men and women participated. Of these, 351 were middle-aged women aged 40–64 years. When we informed them about this study, 46 declined to participate and 305 (86.9%) consented to participate. All of the subjects could walk unaided and appeared healthy. This study was approved by the Institutional Review Board of Fukushima Medical University (no. 574).

General health status

The subjects provided self-reported information regarding their age, smoking status, alcohol consumption, and disease status (whether receiving regular outpatient treatment for hypertension, dyslipidemia, or diabetes mellitus). Public health nurses checked gaps or errors on questionnaire forms, and asked subjects to complete or correct such items. Public health nurses also measured participants’ weight, height, and bone properties using quantitative ultrasonic (QUS) calcaneal measurements. Body mass index (BMI) was calculated as weight (kg)/height (m)2.

Health-Promoting Lifestyle Profile II (HPLP II)

HPLP II is composed of 52-item questionnaire answered according to a four-point scale: 1 never, 2 sometimes, 3 often, and 4 routinely. The instrument consists of six subscales: health responsibility (e.g., discuss health concerns, seek information to take good care of myself), spiritual growth (e.g., feel life has a purpose, look forward to the future), physical activity (e.g., do vigorous exercise three times/week, do moderate physical activity), interpersonal relationships (e.g., get support, maintain meaningful interpersonal relationships), nutrition (e.g., eat breakfast, limit sugars), and stress management (e.g., get enough sleep, maintain balance between work and play). With regard to the validation of this instrument, the alpha reliability coefficient for these six health-promoting components of lifestyle ranged from 0.70 to 0.87 in a Japanese-language version of the HPLP II [13]. Wiley and Camacho defined lifestyle as “discretionary activities with significant impact on health status that are a regular part of one’s daily pattern of living” [19], and HPLP II was constructed on the basis of this definition [12]. Moreover, previous studies have assessed lifestyle with regard to whether public health recommendations were met, and pointed out the importance of a comprehensive and cumulative measure of assessment [17]. On the basis of these previous studies, we defined health-promoting components of lifestyle that scored ≥3.0 (often–routinely) as frequently selected. We created a cumulative term summing up the number of frequently selected health-promoting components of lifestyle in addition to assessment with continuous variables of HPLP II.

Quantitative ultrasonic (QUS) calcaneal measurement

The reproducibility and validity of the calcaneal QUS procedure have been established previously [20]. Although dual-energy X-ray absorptiometry (DXA) is the gold standard in the measurement of BMD, QUS is another promising technology thought to reflect bone stiffness, and a strong correlation has been found between calcaneal DXA measurements and calcaneal QUS measurements (r = 0.859) [21]. In this study, we performed calcaneal QUS (AOS 100; Aloka, Mitaka, Tokyo, Japan), and obtained the osteosonic index (OSI), which is calculated from the speed of sound (SOS) and the transmission index (TI). The OSI is the ultrasound velocity through the dominant heel, and the transmission index (TI) is a value that is proposed to be related to the frequency-dependent attenuation, or broad band ultrasound attenuation (BUA) [20]. The OSI is calculated using these two indices (OSI = TI × SOS2) and provides information on bone stiffness. The precision of the AOS 100 is expressed by the coefficient of variation (CV), and the CV of OSI was 2.2% [20]. The T score of the OSI was calculated by comparing the current subjects’ OSIs (OSI subjects) with the mean OSI value obtained from young healthy Japanese adults aged 20–44 years (OSI young-normal), using the equation: T score = (OSI subjects − OSI young-normal)/SD young-normal, where SD young-normal is the standard deviation (SD) of the values for young adults.

Although QUS seems to be a good predictor of fractures without radiation exposure [22, 23], it is thought to be a screening method rather than a technique for diagnostic classification, and internationally accepted criteria for screening osteoporosis with QUS are not yet established [24–27]. According to the Japanese criteria for screening osteoporosis [28, 29], an OSI less than 2.428 (90% of OSI young-normal; T score = −0.9) is thought to signal the need to change one’s lifestyle to prevent osteoporosis. Thus, in this study, we defined people with an OSI under 2.428 as having low bone stiffness and focused on them.

Statistical analyses

In the analysis of bone stiffness and characteristics, the non-paired Student’s t test was used to analyze differences in age and BMI, and the χ 2 test was used to analyze differences in each of the frequently selected health-promoting components of lifestyle, and current smoking; current drinking; and presence of hypertension, dyslipidemia, and diabetes mellitus with respect to bone stiffness. In the analysis of cumulative health-promoting components of lifestyle, a trend test was used to analyze differences in age; BMI; the prevalence of low bone stiffness; each of the six frequently selected health-promoting components of lifestyle; current smoking; current drinking; and presence of hypertension, dyslipidemia, and diabetes mellitus with respect to the number of frequently selected health-promoting components of lifestyle. Multiple regression analysis was used in subjects with low bone stiffness to assess trends with respect to the number of health-promoting components of lifestyle (crude and adjusted for age, BMI, current smoking, current drinking, and presence of hypertension and diabetes mellitus). All statistical differences were tested at the 0.05 level of significance. The Statistical Package for the Social Sciences (version 15.0J; SPSS Japan, Tokyo, Japan) was used to perform all analyses.

Results

Figure 1 shows the distribution of OSI, and Table 1 shows that, on the basis of QUS, 139 subjects (45.6% of 305 subjects) were defined as having low bone stiffness. The mean age of the low bone stiffness group was significantly higher than that of the normal bone stiffness group. Among the six frequently selected health-promoting components of lifestyle, only interpersonal relationships was significantly higher in the normal bone stiffness group (77.1%) than in the low bone stiffness group (57.6%). We also examined differences in health-promoting lifestyle (total score) as a continuous variable with Student’s t test, but we did not find a significant difference (P = 0.253).

Fig. 1
figure 1

Distribution of osteosonic index (OSI) among 305 middle-aged women in Tadami Town, Fukushima, Japan, 2007. Low bone stiffness (OSI < 2.428) was identified in 139 subjects (45.6%)

Full size image
Table 1 Mean (±SD) and prevalence of characteristics for subjects with normal bone stiffness (OSI ≥ 2.428) and low bone stiffness (OSI < 2.428) among 305 middle-aged women in Tadami Town, Fukushima, Japan, 2007
Full size table

The distribution of the number of frequently selected health-promoting components of lifestyle was as follows: 0, n = 41 (13.4%); 1, n = 71 (23.3%); 2, n = 72 (23.6%); 3, n = 53 (17.4%); 4, n = 40 (13.1%); 5, n = 22 (7.2%); and 6, n = 6 (2.0%). To give similar numbers of subjects in each category, we combined those who selected 4–6 components in the following analyses. Table 2 shows the distribution of each frequently selected health-promoting component of lifestyle and other characteristics by the number of frequently selected health-promoting components of lifestyle. There were no significant trends in age, BMI, OSI, current smoking, current drinking, or presence of dyslipidemia. However, there were significant trends in the prevalence of low bone stiffness, each health-promoting component of lifestyle, and presence of hypertension and diabetes mellitus based on the number of frequently selected health-promoting components of lifestyle. On the basis of general age at menopause of Japanese women, we divided subjects into two subgroups (age >50, ≤50), and each subgroup showed the same trends in the prevalence of low bone stiffness. Therefore, we used combined data in the following analyses. There was no significant association between bone stiffness and health-promoting lifestyle (total score) as a continuous variable on multiple regression analysis (partial regression coefficient = 0.025, P = 0.542). Moreover, there was no significant relationship between bone stiffness and each health-promoting component of lifestyle treated as a continuous variable.

Table 2 Mean (± SD) and prevalence of characteristics stratified by number of frequently selected health-promoting components of lifestyle among 305 middle-aged women in Tadami Town, Fukushima, Japan, 2007
Full size table

Table 3 shows the results of multiple regression analysis for crude figures and after adjusting for age, BMI, current smoking, current drinking, hypertension, and diabetes mellitus. In the crude results, partial regression coefficients of the number of frequently selected health-promoting components of lifestyle was −0.046, and this result was statistically significant (P = 0.031). In the adjusted results, partial regression coefficient of the number of frequently selected health-promoting components of lifestyle was −0.042, and this result was also statistically significant (P = 0.030). The number of frequently selected health-promoting components of lifestyle correlated negatively with the prevalence of low bone stiffness in both crude and adjusted results.

Table 3 Determinants of low bone stiffness: Trend analysis among 305 middle-aged women in Tadami Town, Fukushima, Japan, 2007
Full size table

Discussion

This study suggests that clustering health-promoting components of lifestyle may be an important public health construct for maintaining bone stiffness. The results demonstrate that bone stiffness was reflected by HPLP II, and there was a statistically significant trend for the proportion of women with low bone stiffness to decrease as the number of frequently selected health-promoting components of lifestyle increased. Even after adjusting for age, BMI, current smoking, current drinking, and regular outpatient treatment for hypertension and diabetes mellitus, this trend was significant. Moreover, bone stiffness differed significantly with regard to interpersonal relations. Interpersonal relationships therefore seem to be an additional key factor for maintaining bone stiffness. This is the first study to show the relationship between bone stiffness and clustering health-promoting components of lifestyle.

Previous studies have examined the effect of lifestyle interventions to prevent osteoporosis and have considered these to be promising strategies [30, 31]. In this study, we found that the number of frequently selected health-promoting components of lifestyle was negatively correlated with the prevalence of low bone stiffness. This finding may help individuals to include health-promoting components of lifestyle in addition to avoiding risk behaviors in order to prevent osteoporosis. However, we could not find a significant association with continuous total score of HPLP II. This may be in part because variation in high-scoring health-promoting components of lifestyle at the individual level was balanced by low scoring components of others on population analysis. We also could not find a significant association between the continuous variable of OSI and the number of health-promoting components of lifestyle frequently selected. This may be in part because the number of subjects was small and the analysis was inadequately powered.

According to previous studies, to be maximally effective, interventions to change behavior must create expectations of a positive outcome [32]. Although relief from pain or symptoms often acts as an anticipated positive outcome, osteoporosis is asymptomatic until a fracture occurs. Therefore, other positive outcomes are needed; we believe that well-being is such an outcome. A health-promoting lifestyle is thought to be a positive approach which leads individuals toward well-being [12]. Previous studies also suggest that well-being may have some preventive effects, in addition to freedom from psychological disturbances [33]. Other studies [34, 35] suggest that bone deterioration may be negatively correlated with well-being. The present findings suggest that lifestyle modification toward well-being may help to prevent bone deterioration. A synthetic approach, which includes health responsibility, spiritual growth, interpersonal relationships, and stress management, and physical activity and nutrition, may therefore be effective and complement the traditional strategies.

This study is also one of the first to demonstrate a significant association between interpersonal relationships and bone stiffness. Previous studies suggest interpersonal relationships may be one of the most important components of well-being [36–38]. The results of this study are in agreement with these previous findings. Moreover, interpersonal relationships are thought to be an important component in community-based health-promotion strategies [39, 40]. Our findings suggest that interpersonal relationships may also play a key role in health-promotion strategies for the prevention of osteoporosis in addition to already known factors. However, because relatively little evidence is available on this matter, additional research is needed before any interpretations are made.

This study had several limitations. First, a causal relationship between the clustering health-promoting components of lifestyle and bone stiffness cannot be inferred, although the cross-sectional data support the conclusion that these are associated. Second, this study involved a comparatively small number of subjects. Third, we assessed subjects’ bone status with calcaneal QUS alone. QUS is a relatively new technique, and internationally accepted criteria for screening osteoporosis with QUS are not yet established. Finally, although the subjects were from a healthy general population and we analyzed bone stiffness adjusted for age to minimize the effect of age on results, we did not take a precise history of menopause or medication.

In conclusion, clustering health-promoting components of lifestyle are associated with bone stiffness. This research is particularly important as we suggest health-promotion strategies for the prevention of osteoporosis in addition to traditional strategies. This study also provides suggestions for additional research. Studies focusing on the reliability, validity, predictive strengths, and applied effectiveness of summary measures of clustering healthy lifestyle factors represent important next steps in this area. Additionally, the consideration of other lifestyle factors in the summary measure (e.g., sleep) is also important. Finally, we need more certain evidence of how to effectively facilitate clustering health-promoting components of lifestyle.

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Acknowledgments

Financial support for this study was provided by the Department of Hygiene and Preventive Medicine, Fukushima Medical University. The authors are grateful to the staff of the Health and Welfare Center of Tadami Town. They would also like to thank the subjects whose participation made this investigation possible.

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  1. Department of Hygiene and Preventive Medicine, School of Medicine, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan

    Satoshi Tsuboi, Takehito Hayakawa, Hideyuki Kanda & Tetsuhito Fukushima

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  2. Takehito Hayakawa
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Tsuboi, S., Hayakawa, T., Kanda, H. et al. The relationship between clustering health-promoting components of lifestyle and bone status among middle-aged women in a general population. Environ Health Prev Med 14, 292–298 (2009). https://doi.org/10.1007/s12199-009-0099-4

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Environmental Health and Preventive Medicine

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