Adipopenia is associated with osteoporosis in community-dwelling non-underweight adults independent of sarcopenia

Healthy Cardiovascular Status Attenuates the Detrimental Association Between Osteosarcopenic Adiposity and Alzheimer's Disease-Related Dementia: A UK Biobank Cohort Study

BACKGROUND

Body composition abnormalities are associated with the risk of Alzheimer's disease-related dementia (ADRD). However, the specific link between osteosarcopenic adiposity (OSA), cardiovascular health (CVH), and ADRD is underexplored. This study examined the association between OSA and ADRD to determine whether optimal CVH could modify this association.

METHODS

We analyzed data from 152 028 UK Biobank participants. OSA-related body composition abnormalities include low bone mineral density, low muscle mass/grip strength, and high body fat percentage. CVH was assessed using the Life's Essential 8 questionnaire. High and low CVH corresponded to the lowest and highest cardiovascular disease risks, respectively. The hazard ratios (HRs) and 95% CIs for ADRD were estimated using Cox proportional hazards models. A secondary analysis included 14 750 participants with brain magnetic resonance imaging data to explore the role of brain structure in the association between OSA and the incidence of ADRD.

RESULTS

After a median follow-up of 14.1 years, 2628 participants (1.73%) developed ADRD. Compared with participants with no body composition abnormalities, the adjusted HRs for ADRD risk for those with 1, 2, and 3 abnormalities were 1.04 (95% CI, 0.95-1.14), 1.17 (95% CI, 1.04-1.31), and 1.46 (95% CI, 1.11-1.92), respectively. We found a significant addictive interaction between CVH and abnormal body components, with a relative excess risk due to interaction (95% CI) of -1.34 (95% CI, -2.11 to -0.57). Gray matter in the hippocampus could mediate these associations, with a mediation proportion of 17.3% (P < 0.001).

CONCLUSIONS

OSA components are positively associated with the risk of ADRD. Maintaining optimal CVH status may mitigate ADRD risk in individuals with OSA.

Association of osteoporosis with sarcopenia and its components among community-dwelling older Chinese adults with different obesity levels: A cross-sectional study

We aimed to investigate whether sarcopenia and its components are associated with osteoporosis in community-dwelling older Chinese adults with different obesity levels. This cross-sectional study included 1938 participants (42.1% male) with a mean age of 72.1 ± 5.9 years. The categorization of individuals into various weight categories was based on the Working Group on Obesity in China's criteria, utilizing the body mass index (BMI) as follows: underweight, BMI < 18.5 kg/m2; normal weight, 18.5 ≤ BMI < 24 kg/m2; overweight, 24 ≤ BMI < 28 kg/m2; and obesity, BMI ≥ 28 kg/m2. In this research, the osteoporosis definition put forth by the World Health Organization (bone mineral density T-score less than or equal to -2.5 as assessed by Dual-energy X-ray absorptiometry (DXA)). Sarcopenia was defined according to the diagnostic criteria of the Asian Working Group for Sarcopenia. The prevalence of osteoporosis was highest in the underweight group and gradually decreased with increasing BMI (Underweight: 55.81% vs Normal weight: 45.33% vs Overweight: 33.69% vs Obesity: 22.39). Sarcopenia was associated with elevated odds of osteoporosis in normal-weight subjects independent of potential covariates (OR = 1.70, 95% CI = 1.22-2.35, P = .002). In normal-weight participants, a higher appendicular skeletal muscle mass index (ASMI) was associated with a reduced risk of osteoporosis (OR = 0.56, 95% CI = 0.42-0.74, P < .001). In this study, we found that the prevalence of osteoporosis was highest in the underweight group and gradually decreased with increasing BMI. Sarcopenia, body fat percentage, and ASMI were associated with elevated odds of osteoporosis in normal-weight subjects independent of potential covariates, and higher percent body fat (PBF) was associated with an increased risk of osteoporosis in overweight people, and no such association was found in other weight groups. Different amounts of adipose tissue and muscle mass may alter bone biology. Further longitudinal follow-up studies are required to more accurately assess the risk of osteoporosis and sarcopenia in different weight populations. This cross-sectional study found that the prevalence of osteoporosis was highest in the underweight group and gradually decreased with increasing BMI. Sarcopenia was associated with elevated odds of osteoporosis in normal-weight subjects independent of potential covariates.

Chloroform associated with bone mineral density and bone mineral content in adults: A population-based cross-sectional research

BACKGROUND

Bone mineral density is an important indicator of osteoporosis, and its variation with volatile organic compounds exposure has rarely been studied. However, the relationship between chloroform (an essential volatile organic compounds component) and bone mineral density remains unclear. Consequently, we aimed to explore the relationship between chloroform alone and bone mineral density or bone mineral content.

METHODS

Herein, 2,553 individuals aged 18 and above from the National Health and Nutrition Examination Surveys (NHANES) in 2009-2010, 2013-2014, and 2017-2020, were included. We employed two independent t-tests and multi-linear regression models to statistically assess the relationship between chloroform exposure and BMD/BMC in the spine and femoral area.

RESULTS

A "V"-shaped correlation between chloroform exposure and bone mineral density or bone mineral content (BMD/BMC) was observed in the unadjusted model, particularly in the Ward's triangle and femoral neck as a whole. A negative correlation was specifically observed for the Ward's triangle BMD/BMC and L4 BMD/BMC. On the other hand, in the adjusted model, a dominantly negative correlation between the L4 BMC and chloroform exposure was observed over a range of exposure levels. The subgroup analysis revealed a negative correlation between chloroform concentrations and BMC in the femur and spine, especially in women and the 65-80 age population.

CONCLUSION

Our study revealed a "V" shaped correlation between chloroform and BMD/BMC of the femur and spine in U.S. adults. This finding highlights the fact that prolonged exposure to chloroform may cause the changes in BMD/BMC.