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A cross-sectional analysis of the association between sleep duration and osteoporosis risk in adults using 2005–2010 NHANES

Abstract

Controversy remains regarding the relationship between bone health and sleep. In the literature, the effect of sleep on bone density in the clinical setting varies depending on the definition of normal sleep duration, sleep quality, selected population, and diagnostic tools for bone density. The aim of this study was to examine the association between bone mineral density (BMD)assessed by dual-energy X-ray absorptiometry and sleep duration/quality in the defined adult population from the National Health and Nutrition Examination Survey (NHANES) (a national household survey) within a 6-year period (2005–2010) and explore age differences. The basic variables, metabolic diseases, and bone density in the femoral neck as determined through dual-energy X-ray absorptiometry, were segregated, and analyzed according to different sleep durations (1–4, 5–6,7–8, and > 9 h/day) and sleep quality using multinomial regression models. A total of 12,793 subjects were analyzed. Our results reveal that women aged > 50 years with sleep duration < 5 h/day had a 7.35 (CI 3.438–15.715) odds of osteoporosis than those in other groups. This analysis is based on a nationally representative sample using survey and inspection data and clarifies the relationship between bone density and the effect of the combination of sleep quality and duration.

Introduction

It is estimated that at least 50% of adults experience significant sleep disturbance, especially elderly individuals1. Currently, there is controversy regarding the relationship between bone health and sleep. In the literature, conclusions about the effect of sleep on bone density in a clinical setting vary depending on the definition of normal sleep duration, sleep quality, selected population, and diagnostic tools for bone density. Both long2,3,4,5,6,7,8,9,10 or short4, 5, 7, 8, 11,12,13 self-reported sleep duration have been associated with low bone mineral density (BMD)/osteoporosis or fracture in the literature. Some, studies have not reported an association between sleep duration and BMD14, 15. However, in these studies, the diagnostic methods used for osteoporosis varied considerably, including self-reported osteoporosis fracture, BMD by ultrasonic bone densitometry, peripheral quantitative computed tomography, or dual-energy X-ray absorptiometry (DXA)2,3,4,5,6,7,8,9,10. The gold-standard technique for the diagnosis of osteoporosis is based on BMD at either lumbar spine or hip by DXA technique16. The controversy regarding the effect of sleep on bone density is also based on sample sizes; most of these studies were cross-sectional community-based2,3,4,5,6,7,8,9, 11,12,13, and only few were study population-based from the National Health and Nutrition Examination Survey (NHANES) dataset, which was 4-year aggregated analysis7. Therefore, we would like to expand on the previous NHANES study by 2005–2010 cycle data.

Hip fracture has the worst consequences of patients with osteoporosis17 Hip fractures are classified into femoral neck and trochanteric fractures, each having different etiologies18. In this study, we specifically focusing on the hip area to measure bone density, as hip fracture is the most adverse of the fragility fractures.

The purpose of the study was to examine the association between BMD using the DXA technique and sleep duration/quality in a defined adult population from extended NHANES data (a national household survey) within 6-year period (2005–2010) and explore age differences.

Subjects and methods

Study population and data collection

NHANES is one of a series of health-related programs conducted by the National Center for Health Statistics of the Centers for Disease Control and Prevention, and the database is released periodically. NHANES is a series of cross-sectional national surveys used to examine the health and nutritional status of non-institutionalized Americans. These surveys use stratified multi-stage sampling techniques and documented designs and methods19.

Because the NHANES consists of de-identified secondary data released to the public for research purposes, the NCHS Research Ethics Review Committee approved our investigational procedures, and all subjects or agents provided written informed consent. The study followed relevant guidelines and regulations. The encrypting procedure is consistent so that linkage of claims belonging to the same patient is feasible within the NHANES. The content of examinations includes anthropometrics, health and nutrition questionnaires, and laboratory tests. All subjects completed home interviews. Subjects aged < 18 years and those with incomplete anthropometric data, questionnaires, or laboratory tests were excluded from the study. We analyzed the subjects recorded in NHANES from 2005 to 2010. Figure 1 shows the flow chart for the selection of the study population.

Figure 1
figure1

The selection process of subjects from the 2005–2010 NHANES database.

Definition of sleep duration and quality

The duration of sleep was captured by a single question in NHANES: How much sleep do you usually get at night on weekdays or workdays? ” The response categories range 1–12, with 12 indicating that the subject slept for ≥ 12 h. Sleep duration was analyzed as both a continuous and categorical variable. Based on previous studies20,21,22, categories were assigned toa number of different sleep durations (“very short”: 1–4 h/day;“short”:5–6 h/day;“average”:7–8 h/day; and “long”: > 9 h/day). Sleep quality (yes versus no) was defined by the following questions: “Ever told doctor had trouble sleeping?” and” Ever told by doctor have sleep disorder?”.

Definition of osteoporosis and age criteria

The study subjects were examined using DXA for BMD (g/cm2). BMD of the femoral neck, trochanteric, intertrochanteric, and total femoral areas were measured by a DXA scan (Hologic, Bedford, MA, USA). Quality control was routinely conducted on all DXA machines. We classify the bone health status into low BMD (osteopenia)/osteoporosis/ normal by WHO criteria, which bone mineral density at the femoral neck equal to or less than 2.5 standard deviations below the mean for a young person of the same sex is diagnostic of osteoporosis. Low BMD (or osteopenia) is reported as a T score <  − 1.0 and >  − 2.523.

Bone loss accelerates with aging, especially in menopausal women; 40% of US White women and 13% of US White men aged > 50 years will experience at least one clinically apparent fragility fracture in their lifetime24. Therefore, we set 50yearsas the age division for analysis.

The present study was approved by the Human Research Review Committee of the Taichung Veterans General Hospital, Taiwan (CE19051B).

Statistical analysis

Unless otherwise stated, the data are expressed as the mean ±  ± 95% confidence interval. All reported p-values are bidirectionally < 0.05 denoted statistical significance. Because the survey design of the NHANES study is complex (e.g., complex surveys designed with stratification, clustering, and/or unequal weights), the usual estimates are not appropriate, and all analyses were appropriately weighted to represent the US population. Weighted data were calculated according to analytical guidelines (US National Health and Nutrition Survey: Analytical Guidelines, 2011–2014 and 2015–2016. Available online)19. Analysis of variance was used to examine significant differences in baseline demographics and characteristics across groups with different sleep durations. The sample-weighted analysis of variance test was performed using the SAS SURVEYREG Procedure according to the analysis program’s User's Guide. Multinomial logistic regression was used to estimate the impacts of sleep duration on osteoporosis, low BMD (osteopenia) and normal BMD by using the SURVEYLOGISTIC Procedure. We adjusted for age, energy intake, chronic kidney disease status, and body weight. Odds ratio (OR) and 95% confidence interval from multinomial logistic regression were reported. The data were analyzed using SAS software (version 9.4, 2013; SAS, Cary, NC, USA).

Ethical approval

This study was approved by the Ethics Committee of Taichung Veterans General Hospital (IRB number: CE19051B).

Results

Initially, 31,034 subjects were considered. After excluding those who did not meet the criteria, 12,793 subjects were enrolled in this study (Fig. 1).

The medical parameters are shown in Table 1. In our study population, most subjects had a sleep duration of 7–8 h/day (54.2%), which was set as reference. The next most prevalent sleep duration group was 5–6 h/day (33.2%); the duration with the fewest instances was 1–4 h/day (5.6%). On average, men had shorter sleep duration than women (men: 6.8 ± 0.02 h/day; women: 7 ± 0.0 3 h/day). There were no significant differences in sleep duration in terms of age or race. There were 13% of the population with fracture history. Of the included subjects, 25% had sleep disorder.

Table 1 Characteristics by Sleep duration group.

Subjects who had 1–4 h ‘sleep time were predominantly male, younger, and had higher body mass index (all p < 0.001). They also had higher levels of fasting glucose, hemoglobin A1c, total cholesterol, triglycerides, systolic blood pressure, and diastolic blood pressure; however, they had lower levels of high-density lipoprotein (all p < 0.001). There were more subjects with diabetes mellitus in this group compared with the other sleep duration groups. In this group, 55% had sleep disorder.

BMD (T-score) over femoral neck, trochanteric, intertrochanteric, and total femoral areas in 4 type of sleep duration were shown in Table 2. We used FN BMD to calculated T-scores, and classified participants into 4 type of sleep duration. The femur neck, as the primary site for osteoporosis diagnosis, we further reclassify the cases into low BMD (osteopenia) /osteoporosis/ normal by WHO criteria. The classification based other femur sites was shown in the supplemental material (please see the Supplementary Tables S1S3). Sleep duration was significantly associated with diagnosis of osteoporosis. While the impact of sleep on the occurrence of osteoporosis based on the WHO definition, there was a higher risk of osteoporosis or low bone density in the case of sleep for less than 4 h (Table 3). This phenomenon is especially obvious in women (Osteoporosis vs. Normal-(OR 4.082 (CI 2.107–7.91); Low BMD vs. Normal- OR 1.753 (CI 1.238–2.483)) and people over 50-year-old (Osteoporosis vs. Normal-OR 3.197 (CI 1.808–5.655); Low BMD vs. Normal-OR 1.709 (CI 1.216–2.403)). The quality of sleep did not affect the bone density statistically significant.

Table 2 BMD (T-score) over femoral neck, trochanteric, intertrochanteric, and total femoral areas in 4 type of sleep duration.
Table 3 Diagnosis of osteoporosis, low BMD, or normal bone density based on T score over femoral neck.

We further evaluate the combined effect of sleep hours, gender, and age. As shown in Table 4, in the case of females aged over fifty with sleep hours less than 5 h/day, the odds ratio of osteoporosis was 7.35 (CI 3.438–15.715) and low BMD was 3.002 (CI 1.828–4.932), respectively. However, there is no significant difference in diagnosis of osteoporosis by the effect of self-report sleep quality (Table 3/4).

Table 4 Effect of sleep hours and sleep disorder in over fifty-year-old female on bone density in femoral neck.

Discussion

This large population-based study revealed that women aged > 50 years with sleep duration < 5 h/day had odds ratio 7.35 (CI 3.43–15.71) with osteoporosis and subjects with poor sleep quality had 5.57 (CI 1.60–19.41) odds of osteoporosis. We assessed the quality of sleep to identify subjects suffering from sleep disorder in a manner comparable with previous NHANES cohort studies7, 21. The analysis showed that sleep duration rather than the sleep quality influence the bone density.

Sleep affects bone metabolism and bone density through multiple mechanisms. It includes alterations in the normal rhythmicity of bone cells, hormone levels (e.g., growth hormones, sex steroids, cortisol), increases in sympathetic tone13, 25, inflammation26, metabolic derangements27, or fatigue/physical inactivity28. Previous evidence has shown that sleep architecture varies with age. Total nocturnal sleep time and total sleep time decrease with aging29. A decline in sleep quality reduces the chance to reach slow-wave sleep, during which most growth hormones are secreted30,31,32. When the depth of sleep is insufficient, the reduction in growth hormone secretion leads to bone loss33.

The defined sleep duration associated with osteoporosis or high risk of fracture differs in the literature; short/insufficient sleep durations were < 52, 12, 66, 14, 34, and 6.5 h/day11. Considering that sleep duration decreases with age30, age may be a factor affecting BMD. However, the age criteria of assessing a population also vary in the literature, and include > 18 years8, 12, 20–66 years11, middle-age (> 40 years4, 5, 35; 45 years2, 3, 13, 36; and 50 years7, 9, 20), and the elderly (> 60 years6, 10, 14, 34; and 69 years37). The sleep pattern also differs between genders38. Middle-aged women need longer29 and more slow-wave29, 39 sleep time than men.

The majority of subjects in previous research studies were women12, 37, 40. To clarify the effect of sleep/age/gender in bone health, a large population-based study with a standard measurement such as NHANES is warranted to avoid this type of bias.

By selecting a population in the NHANES (i.e., adults aged > 50 years between 2005–2006 and 2007–2008), Cunningham et al. found that a sleep duration < 6 h per night was associated with a significantly increased risk of osteoporosis in those aged > 65 years7. Similarly, using NHANES, the present study analyzed the sleep duration/quality in the whole adult group of both genders for a more comprehensive interpretation of the relationship between sleep and bone density. Women aged > 50 years who had short sleep duration were at 7.35 (CI 3.43–15.71) odds of osteoporosis and 3.002 (CI 1.82–4.93) odds of low bone density compared with men, younger individuals, and those with longer sleep duration.

In conditions of stress and lack of sleep, an increase in systemic inflammation is more dominant in women41, and this also contributes to bone loss. Moreover, the lack of estrogen in postmenopausal women can exacerbate bone loss42, 43. These findings may explain the lower bone density observed in womenaged50yearswith poor sleep quality and shorter sleep duration in this study.

Consistent with the findings of another study20, our results revealed the critical effect of sleep quality on bone density. This observation may explain the significant association of both short and prolonged (> 9 h/day) sleep duration with the risk of osteoporosis8, 44. Sleep quality in most elderly individuals is poor. Therefore, we can conclude that early screening and intervention for bone density in elderly patients with insomnia may improve their quality of life.

Most previous studies have not evaluated the combined effects of sleep time and quality; in addition, there are various methods for evaluating sleep quality. In the literature, self-reported sleep is associated with an increased risk of osteoporosis4; while using the Pittsburgh Sleep Quality Index (PSQI) to assess sleep quality, the results show that it will cause bone loss43. However, the interaction between sleep quality and sleep duration, and comorbidity is complicated. The effect of quality is not so obvious after adjusting these confounding factors40, 45.

There were several limitations to our study. Firstly, we did not use the lumbar spine BMD DXA data in the diagnosis of osteoporosis; however, the T-score from hip BMD more reliably reflects the risk of hip fracture46. Ochs-Balcomet al. reported a similar pattern for hip and spine BMD by analyzing 11,084 postmenopausal women (aged > 50 years) from the Women’s Health Initiative40. Secondly, this was a cross-sectional study, similar to previous population-based studies2,3,4,5,6,7,8,9, 11,12,13, which limits the ability to measure temporality. Hence, causality may not be determined. However, we examined a 6-year period (2005–2006/2007–2008/2009–2010) of the NHANES to avoid bias as much as possible. Thirdly, information regarding sleep was self-reported in our study. Self-reported information is less accurate than objective measurements. The level of disagreement between subjective and objective measurements of sleep duration increased with male gender, poor cognitive function, and functional disability, particularly among older subjects47. Due to other confounding factors, including sleep onset10 and sleep apnea25, any potential changes in sleep duration during follow-up remained undetected. A verified questionnaire scale of sleep quality is warranted for future studies, as these biases could lead to misclassification and underestimation of the association between sleep and bone density.

In summary, this analysis was based on a nationally representative sample using survey and inspection data. The results indicated that sleep duration < 5 h/day was associated with a higher risk of low bone density in women aged > 50 years with poor sleep quality. Our findings add to the current body of knowledge regarding relationships between bone health and the combined effect of sleep duration and gender. In future research, it is important to assess the potential causal effects of this association beyond the dimensions of the cross-sectional design.

Data availability

Large computerized datasets (NHIRD) were used to perform this nationwide population-based cohort study48.

Abbreviations

BMD:

Bone mineral density

CI:

Confidence interval

DXA:

Dual-energy X-ray absorptiometry

NHANES:

National Health and Nutrition Examination Survey

OR:

Odds ratio

PSQI:

Pittsburgh Sleep Quality Index

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Acknowledgements

We thank Uni-edit (www.uni-edit.net) for editing and proofreading this manuscript.

Funding

This study was supported in part by the Taichung Veterans General Hospital, Taiwan (Grant number: TCVGH-1093602B).

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All authors made substantive intellectual contributions to this study and qualify as authors. Authors’ roles: study conception and design (C.-L.L., H.-E.T., C.-H.T.); data collection (C.-L.L., W.-J.L.), data analysis (C.-L.L., C.-H.T.); interpretation of results (all authors); drafting of manuscript (C.-L.L., H.-E.T.); critical review of the manuscript (all authors).

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Correspondence to Chun-Hao Tsai.

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Lee, CL., Tzeng, HE., Liu, WJ. et al. A cross-sectional analysis of the association between sleep duration and osteoporosis risk in adults using 2005–2010 NHANES. Sci Rep 11, 9090 (2021). https://doi.org/10.1038/s41598-021-88739-x

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