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More muscle torque associated with higher vitamin D – Jan 2017

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.

VitaminDWiki Summary

Forty-ish adults in Turkey, mostly women: divided into 2 groups Vitamin D - based on cutpoint of 14 ng
Note: Turkey, like much of the Middle East, has low vitamin D levels

Torque9 ng
21 ng
Knee flexion
(180 degrees/sec )
42 52. 0.00719%
Knee extension
(180 degrees/sec )
82100 0.00118%

See also VitaminDWiki

Overview Sports and vitamin D has the following summary
Athletes are helped by vitamin D by:

  1. Faster reaction time
  2. Far fewer colds/flus during the winter
  3. Less sore/tired after a workout
  4. Fewer micro-cracks and broken bones
  5. Bones which do break heal much more quickly
  6. Increased VO2 and exercise endurance Feb 2011
  7. Indoor athletes especially need vitamin D
  8. Professional indoor athletes are starting to take vitamin D and/or use UV beds
  9. Olympic athletes have used UV/vitamin D since the 1930's
  10. The biggest gain from the use of vitamin D is by those who exercise less than 2 hours per day.
  11. Reduced muscle fatigue with 10,000 IU vitamin D daily
  12. Muscle strength improved when vitamin D added: 3 Meta-analysis
  13. Reduced Concussions
    See also: Sports and Vitamin D category 267 items

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The objective of this study was to explore the association between 25- hydroxyvitamin D (25(OH)D) and muscle strength/architecture.

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.

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).

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

Attached files

ID Name Comment Uploaded Size Downloads
7626 Torque.jpg admin 05 Jan, 2017 13:51 47.03 Kb 655
7625 Muscle strength Jan 2017.pdf PDF 2017 admin 05 Jan, 2017 13:51 5.09 Mb 929