Acute Effects of Vitamin D3 Supplementation on Muscle Strength in Judoka Athletes

Wyon, Matthew; Wolman, Roger; Nevill, Alan M.; Cloak, Ross; Metsios, George S.; Gould, Douglas W.; Ingham, Andrew; Koutedakis, Yiannis

doi:10.1097/jsm.0000000000000264

Cited by 72 publications

(80 citation statements)

References 31 publications

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“…The intervention group also sustained significantly less injuries than the controls during the study period. In agreement with these data are the findings of another study from the same group [213]. The authors examined the acute effects of vitamin D supplementation on muscle function using isokinetic dynamometry.…”

Section: Vitamin D Supplementation and Athletessupporting

confidence: 74%

Vitamin D and Physical Activity

Koundourakis¹,

Margioris²

2017

A Critical Evaluation of Vitamin D - Basic Overview

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Vitamin D is synthesized in the skin following exposure to ultraviolet radiation, producing cholecalciferol, while only a small percentage of the circulating vitamin D is of exogenous origin deriving from food. Following two sequential hydroxylations, in the liver and in the kidneys, vitamin D is fully activated. Although its role in bone physiology and calcium homeostasis is well documented, there is emerging evidence that vitamin D exerts a plethora of additional effects on most tissues regulating the musculoskeletal, cardiovascular, and immune systems as well as energy homeostasis. Its deficiency/insufficiency poses a major public health problem observed in all age groups and regardless of latitude and insolation. In muscles, vitamin D deficiency is associated with a decline in neuromuscular function including muscular strength, walking speed, balance, jumping and sprinting performance, and aerobic capacity, although the evidence is still weak regarding its effects in the young and the athletes. Supplementation counteracts the negative effects of vitamin D deficiency on performance although in individuals with adequate levels of vitamin D, additional supplementation does not appear to enhance further physical capabilities. The aim of this chapter is to review our current understanding of diverse effects of vitamin D in physical performance in athletic and nonathletic populations.

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Section: Vitamin D Supplementation and Athletessupporting

confidence: 74%

Vitamin D and Physical Activity

Koundourakis¹,

Margioris²

2017

A Critical Evaluation of Vitamin D - Basic Overview

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“…Two of these studies applied a relatively high dose (60,000 and 14,000 IU vitamin D per week) over four to six months [23,41]. A single bolus of 150,000 IU vitamin D increased quadriceps muscle strength of elite judokas significantly after eight days [42]. In contrast, a dose of 2000 IU vitamin D daily over 12 weeks did not significantly increase swimming performance as well as arm-grip strength and one-legged balance in adolescent swimmers [20].…”

Section: Discussionmentioning

confidence: 99%

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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“…In agreement with these data are the findings of another study from the same group. 129 The authors examined the effect of vitamin D supplementation on muscle function using isokinetic dynamometry in male judoka athletes randomly allocated to vitamin D treatment or placebo. The former group had a significant increase in muscle strength.…”

Section: Effect Of Vitamin D Supplementation On Athletic Performancementioning

confidence: 99%

Muscular effects of vitamin D in young athletes and non-athletes and in the elderly

Koundourakis¹,

Avgoustinaki²,

Malliaraki³

et al. 2017

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Acute Effects of Vitamin D3 Supplementation on Muscle Strength in Judoka Athletes

Cited by 72 publications

References 31 publications

Vitamin D and Physical Activity

Vitamin D and Physical Activity

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

Muscular effects of vitamin D in young athletes and non-athletes and in the elderly

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