More muscle torque associated with higher vitamin D
Does vitamin D affect muscle strength and architecture? An isokinetic and ultrasonographic study.
Asia Pac J Clin Nutr. 2017 Jan;26(1):85-88. doi: 10.6133/apjcn.102015.12.
Kara M1, Ekiz T2, Kara Ö3, Tiftik T4, Malas FÜ4, Özbudak Demir S4, Özgirgin N4.
mean | 21 ng
mean | p | %
higher | | Knee flexion
(180 degrees/sec ) | 42 | 52. | 0.007 | 19% | | Knee extension
(180 degrees/sec ) | 82 | 100 | 0.001 | 18% | See also VitaminDWiki * Vitamin D supplementation improves muscle strength in healthy adults – meta-analysis of 6 RCT Aug 2014 * Elderly lower limb muscle strength improved with Vitamin D supplementation - Meta-analysis Oct 2013 * Vitamin D increased muscle strength by 1% to 19% (varied with dose and duration) – review June 2016 * Fastest US High School sprinters are both at the school taking lots of vitamin D (Matthews) May 2016 * Book on Sports and vitamin D - Aug 2011 Dr. Cannell Overview Sports and vitamin D has the following summary {include} {include}
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BACKGROUND AND OBJECTIVES:
The objective of this study was to explore the association between 25- hydroxyvitamin D (25(OH)D) and muscle strength/architecture.
METHODS AND STUDY DESIGN:
Thirty patients (27 women, 3 men) were allocated into Group I (n=15, mean age; 44.4±9.4 years) and Group II (n=15, mean age; 39.0±9.9 years) according to the median of 25(OH)D (<13.7 ng/mL vs >13.7 ng/mL, respectively). Peak torque/body weight of the knee flexor/extensor muscles at 60°/sec and 180°/sec and those of ankle flexor/ extensor muscles at 30°/sec and 90°/sec were evaluated by using a Biodex System 3 Pro Multijoint System isokinetic dynamometer. A 7-12 MHz linear array probe was used to evaluate thickness (MT), pennation angle (PA) and fascicle length (FL) of medial gastrocnemius and vastus lateralis muscles.
RESULTS:
Mean of 25(OH)D was 9.4±2.5 ng/mL and 20.7±8.3 ng/mL in Groups I and II, respectively. Although all isokinetic strength parameters were lower in Group I, significant differences were found in knee flexion at 180°/sec (p=0.007), knee extension at 30°/sec (p=0.038) and 180°/sec (p=0.001), and ankle extension at 30°/sec (p=0.002) and 90°/sec (p=0.007). On the other hand, no significant difference was found between the groups regarding MT, PA and FL values (all p>0.05).
CONCLUSION:
In light of our results, we can argue that 25(OH)D is associated with muscle strength but not with muscle architecture. Further studies concerning the long-term follow-up effects of 25(OH)D treatment on muscle strength are awaited.
PMID: 28049266