Abstract
Background
Although several studies have suggested a potential positive association between serum vitamin D levels and muscle strength in older adults, it remains unclear whether this relationship is sex-dependent.
Aim
To evaluate the association between serum 25 hydroxyvitamin D [25(OH)D] levels and muscle strength in older adults and to assess whether this association is dependent on sex.
Methods
This cross-sectional study utilized data from the National Health and Nutrition Examination Survey (NHANES) conducted between 2001 and 2002. A total of 1173 individuals aged 50–85 years (630 men and 543 women) were included in the analysis. The peak isokinetic force of the knee extensor was assessed using a kinetic communicator isokinetic dynamometer. Serum 25(OH)D levels were measured using the standardized liquid chromatography-tandem mass spectrometry method. Linear regression analyses were conducted to estimate coefficients and 95% confidence intervals for muscle strength across tertiles of serum vitamin D levels, adjusting for potential confounders.
Results
Tertiles of serum vitamin D were positively associated with muscle strength in older men (p-trend = 0.007), whereas no association was observed in older women (p-trend = 0.140) or in the total sample (men and women together; p-trend = 0.139).
Conclusion
Serum vitamin D levels were positively associated with muscle strength specifically in older men, whereas no association was observed in older women. These results suggest that the relationship between vitamin D and strength may be sex-dependent.
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Data availability
Data from the National Health and Nutrition Examination Survey (NHANES) are publicly available and can be accessed directly at https://www.cdc.gov/Nchs/Nhanes.
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Acknowledgements
IMS and EPO are grateful to the “Conselho Nacional de Desenvolvimento Científico e Tecnológico” (CNPq, Brazil).
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IMS participated in interpretation of the data and wrote the manuscript; LSL and FMSB participated in the analysis, interpretation of the data and revised the manuscript; EPO participated in the analysis and interpretation of the data; wrote and revised the manuscript. All authors read and approved the final manuscript.
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NHANES is a publicly available dataset, and all participants provided written informed consent, as per the approval from the National Center for Health Statistics Research Ethics Review Board (NCHS ERB) (protocol #98-12 for NHANES cycle 1999-2002).
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Sponchiado, I.M., Limirio, L.S., de Branco, F.M.S. et al. Sex-dependent association of serum vitamin D with muscle strength in older adults: NHANES 2001–2002. Eur J Clin Nutr 78, 847–854 (2024). https://doi.org/10.1038/s41430-024-01472-2
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DOI: https://doi.org/10.1038/s41430-024-01472-2


