| Title: | Linear and Nonlinear Associations Between Vitamin D and Grip Strength: A Mendelian Randomization Study in UK Biobank |
| Journal: | The Journals of Gerontology Series A |
| Published: | 25 Dec 2022 |
| Pubmed: | https://pubmed.ncbi.nlm.nih.gov/36566435/ |
| DOI: | https://doi.org/10.1093/gerona/glac255 |
| URL: | https://academic.oup.com/biomedgerontology/advance-article-pdf/doi/10.1093/gerona/glac255/49170401/glac255.pdf |
| Citations: | 6 (6 in last 2 years) as of 8 Aug 2024 |
Publication 8017
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Abstract
BACKGROUND: Low vitamin D status is a widespread phenomenon. Similarly, muscle weakness, often indicated by low grip strength, is another public health concern; however, the vitamin D-grip strength relationship is equivocal. It is important to understand whether variation in vitamin D status causally influences muscle strength to elucidate whether supplementation may help prevent/treat muscle weakness.</p>
METHODS: UK Biobank participants, aged 37-73 years, with valid data on Vitamin D status (circulating 25-hydroxyvitamin D [25(OH)D] concentration) and maximum grip strength were included (N = 368,890). We examined sex-specific cross-sectional associations between 25(OH)D and grip strength. Using Mendelian randomization (MR), we estimated the strength of the 25(OH)D-grip strength associations using genetic instruments for 25(OH)D as our exposure. Crucially, because potential effects of vitamin D supplementation on strength could vary by underlying 25(OH)D status, we allowed for nonlinear relationships between 25(OH)D and strength in all analyses.</p>
RESULTS: Mean (SD) of 25(OH)D was 50 (21) nmol/L in males and females. In cross-sectional analyses, there was evidence of nonlinear associations between 25(OH)D and strength, for example, compared to males with 50 nmol/L circulating 25(OH)D, males with 75 nmol/L had 0.36 kg (0.31,0.40) stronger grip; males with 25 nmol/L had 1.01 kg (95% confidence interval [CI]: 0.93, 1.08) weaker grip. In MR analyses, linear and nonlinear models fitted the data similarly well, for example, 25 nmol/L higher circulating 25(OH)D in males was associated with 0.25 kg (-0.05, 0.55) greater grip (regardless of initial 25(OH)D status). Results were similar, albeit weaker, for females.</p>
CONCLUSIONS: Using two different methods to triangulate evidence, our findings suggest moderate to small causal links between circulating 25(OH)D and grip strength.</p>
9 Authors
- Snehal M Pinto Pereira
- Victoria Garfield
- Thomas Norris
- Stephen Burgess
- Dylan M Williams
- Richard Dodds
- Avan A Sayer
- Sian M Robinson
- Rachel Cooper
1 Application
| Application ID | Title |
|---|---|
| 71702 | Exploring the multifactorial nature of age-related health deterioration |
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