Randomized Study of the Effects of Vitamin D and Magnesium Co-Supplementation on Muscle Strength and Function, Body Composition, and Inflammation in Vitamin D-Deficient Middle-Aged Women.
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
vitamin D and magnesium co-supplementation | increase | handgrip strength | vitamin D-deficient middle-aged women | - | significant difference was observed | #1 |
vitamin D and magnesium co-supplementation | decrease | time for Time Get Up and Go (TGUG) test | vitamin D-deficient middle-aged women | - | significant difference was observed | #2 |
vitamin D and magnesium co-supplementation | no change | percentage of fat mass (FM%) | vitamin D-deficient middle-aged women | - | no significant difference | #3 |
vitamin D and magnesium co-supplementation | no change | fat free mass (FFM%) | vitamin D-deficient middle-aged women | - | no significant difference | #4 |
vitamin D and magnesium co-supplementation | no change | knee extension strength | vitamin D-deficient middle-aged women | - | no significant difference | #5 |
vitamin D and magnesium co-supplementation | increase | Serum 25(OH)-D levels | vitamin D-deficient middle-aged women | - | increased significantly | #6 |
vitamin D and magnesium co-supplementation | decrease | Serum level of hs-CRP | vitamin D-deficient middle-aged women | - | decreased significantly | #7 |
vitamin D and magnesium co-supplementation | decrease | Serum level of TNF-α | vitamin D-deficient middle-aged women | - | declined significantly | #8 |
vitamin D and magnesium co-supplementation | no change | serum levels of TNF-α | vitamin D-deficient middle-aged women | - | no significant differences were seen | #9 |
vitamin D and magnesium co-supplementation | no change | serum levels of IL-6 | vitamin D-deficient middle-aged women | - | no significant differences were seen | #10 |
This study aimed to investigate the effects of vitamin D and magnesium co-supplementation on muscle strength and function, body composition, and inflammation in vitamin D-deficient middle-aged women. In this study, 83 healthy middle-aged women (40-55 years) with vitamin D deficiency were randomly assigned into two groups: (1) intervention: receiving a 50,000-IU vitamin D soft gel (weekly) plus a 250-mg magnesium tablet (daily); (2) control: receiving a vitamin D placebo (weekly) plus a magnesium placebo (daily), for 8 weeks. Before and after the intervention, anthropometric indices, muscle strength, muscle function, and some inflammatory markers were measured. After 8 weeks of supplementation, significant difference was observed in handgrip strength and time for Time Get Up and Go (TGUG) test between the intervention and placebo groups (P < 0.05). Regarding percentage of fat mass (FM%) and fat free mass (FFM%), and knee extension strength, there was no significant difference between the two groups at the end of intervention (P > .05). Serum 25(OH)-D levels increased significantly (P < 0.001) and its change was significantly different between the two groups, at the end of the intervention (P < 0.001). Serum level of hs-CRP decreased significantly in the intervention group compared to baseline (P < 0.001), and the change in hs-CRP was significant between the two groups at the end of the intervention (P < 0.01). Furthermore, serum level of TNF-α declined significantly in the intervention group compared to baseline (P < 0.001) but, no significant differences were seen between the two groups in regard of serum levels of TNF-α and IL-6 after the intervention (P > 0.05). Our findings show that vitamin D and magnesium co-supplementation, for 8 weeks, in healthy middle-aged women with vitamin D deficiency have beneficial impacts on muscle strength, muscle function, and probably inflammation.