Vitamin D deficiency in Swiss elite wheelchair athletes

Flueck, Joëlle Leonie; Hartmann, K; Strupler, Matthias; Perret, Catherine

doi:10.1038/sc.2016.33

Cited by 24 publications

(28 citation statements)

References 30 publications

(41 reference statements)

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“…Similar to the studies with able-bodied individuals, a high prevalence of vitamin D deficiency or insufficiency was found in patients [24] and athletes [25,26] with a spinal cord injury. Due to the impairment of the spinal cord, muscle strength might already be decreased and an additional impairment through vitamin D deficiency needs to be avoided.…”

Section: Introductionsupporting

confidence: 75%

“…The prevalence of vitamin D deficiency was even higher in indoor wheelchair athletes compared to outdoor athletes [25]. Nevertheless, it was surprising that all recruited athletes in the present study showed a deficient vitamin D status at baseline (44 ± 18 nmol/L).…”

Section: Discussionmentioning

confidence: 63%

“…It is already well-known that a high amount of able-bodied and disabled Swiss athletes suffer from vitamin D deficiency or insufficiency during winter months [25,35]. The prevalence of vitamin D deficiency was even higher in indoor wheelchair athletes compared to outdoor athletes [25].…”

Section: Discussionmentioning

confidence: 99%

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Effect of 12-Week Vitamin D Supplementation on 25[OH]D Status and Performance in Athletes with a Spinal Cord Injury

2016

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(1) Background: studies with able-bodied athletes showed that performance might possibly be influenced by vitamin D status. Vitamin D seems to have a direct impact on neuromuscular function by docking on vitamin D receptors in the muscle tissue. Additionally, a high prevalence of vitamin D deficiency was shown not only in infants and in the elderly but also in healthy adults and spinal cord injured individuals. Therefore, the aim of our study was to investigate whether a vitamin D dose of 6000 IU daily over 12 weeks would be sufficient to increase vitamin D status in indoor wheelchair athletes to a normal or optimal vitamin D level and whether vitamin D deficiency is associated with an impairment in muscle performance in these individuals; (2) Methods: vitamin D status was assessed in indoor elite wheelchair athletes in order to have a baseline measurement. If vitamin D status was below 75 nmol/L, athletes were supplemented with 6000 IU of vitamin D daily over 12 weeks. A vitamin D status over 75 nmol/L was supplemented with a placebo supplement. Vitamin D status, as well as a Wingate test and an isokinetic dynamometer test, were performed at baseline and after six and 12 weeks; (3) Results: 20 indoor elite wheelchair athletes participated in this double-blind study. All of these athletes showed an insufficient vitamin D status at baseline and were, therefore, supplemented with vitamin D. All athletes increased vitamin D status significantly over 12 weeks and reached an optimal level. Wingate performance was not significantly increased. Isokinetic dynamometer strength was significantly increased but only in the non-dominant arm in isometric and concentric elbow flexion; (4) Conclusion: a dose of 6000 IU of vitamin D daily over a duration of 12 weeks seems to be sufficient to increase vitamin D status to an optimal level in indoor wheelchair athletes. It remains unclear, whether upper body performance or muscle strength and vitamin D status are associated with each other.

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Section: Introductionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 63%

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Effect of 12-Week Vitamin D Supplementation on 25[OH]D Status and Performance in Athletes with a Spinal Cord Injury

2016

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“…In addition, parathyroid hormone concentration decreased significantly in these individuals. Two studies showed a higher prevalence of vitamin D deficiency during the winter months, 21,34 whereas two other studies resulted in a lower vitamin D status in African Americans compared with that in Caucasians. 34,35 A significantly lower vitamin D status was detected in patients compared with that in controls, 26,28,33 whereas Vaziri, Pandian 25 did not find any difference between individuals with a SCI and able-bodied controls regarding vitamin D status.…”

Section: Resultsmentioning

confidence: 97%

“…Two studies investigated the vitamin D status in elite wheelchair athletes. 21,22 Two studies investigated vitamin D status in individuals with an acute SCI (o9 months). Most studies used 50 nmol l − 1 (20 ng ml − 1 ) as the threshold for vitamin D deficiency and 75 nmol l − 1 (30 ng ml − 1 ) for suboptimal or insufficient vitamin D status.…”

Section: Resultsmentioning

confidence: 99%