Efficacy of Vitamin D supplementation in physical performance of Iranian elite athletes

Alimoradi, Karamollah; Nikooyeh, Bahareh; Ravasi, Ali Asghar; Zahedirad, Maliheh; Shariátzadeh, Nastaran; Kalayi, Ali

doi:10.4103/ijpvm.ijpvm_227_18

Cited by 17 publications

(8 citation statements)

References 46 publications

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“…Previous literature suggests vitamin D may increase performance, specifically muscular strength, due to an increase in the size and number of type II muscle fibers. 46 A study by Alimoradi et al 47 showed significant increases in leg press and sprint tests in athletes supplemented with 50,000 IU wk −1 vitamin D. Therefore, the NMFS should focus on increasing the amount of vitamin D rich food items for WLFFs to meet their vitamin D nutrient needs as well as consider providing a more significant amount of nutrient-dense food options to increase the food quality provided to WLFFs.…”

Section: Discussionmentioning

confidence: 99%

Nutrient Intake of Wildland Firefighters During Arduous Wildfire Suppression

Brooks

West

Domitrovich

et al. 2021

Journal of Occupational &Amp; Environmental Medicine

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Wildland firefighters (WLFFs) perform in adverse environments making rapid adjustments to dietary needs. The National Mobile Food Services (NMFS) contract details WLFF dietary provisions on wildfire incidents. Objective: Determine the nutrient content of food and drink provided to and consumed by WLFFs under the NMFS contract. Methods: Individual ( n = 122) dietary provisions and consumption was recorded during 1 workday. Nutritional analysis of items provided was compared with consumption and the recommended dietary allowance (RDA). Results: WLFFs consumed significantly ( P < 0.05) fewer macronutrients than provided for calories, protein, and fat. Provided and consumed micronutrients were below the RDA for vitamins D and E, magnesium, and manganese. Conclusion: Most dietary recommendations were met by NMFS provisions. Next steps include WLFF nutrition education to improve consumption and contract revisions to meet micronutrient recommendations.

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Section: Discussionmentioning

confidence: 99%

Nutrient Intake of Wildland Firefighters During Arduous Wildfire Suppression

Brooks

West

Domitrovich

et al. 2021

Journal of Occupational &Amp; Environmental Medicine

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“…We found association between serum 25(OH)D levels and results in the S20M, 20Y, and RSI, with better results in fitness tests among those players who had higher levels of 25(OH)D Meanwhile, the findings of previous studies that investigated the effects of 25(OH)D levels on sports performance are not consistent. Koundourakis et al, (2014) found a correlation of sprint and jumping test results with 25(OH)D levels in professional Greek soccer players, whereas several other studies did not [ 20 , 25 ]. Additionally, some studies concluded that soccer players with lower 25(OH)D levels have lower results in performance tests [ 39 ].…”

Section: Discussionmentioning

confidence: 99%

“…A significant correlation was found between vitamin D levels and muscle functioning assessed with jumping, sprinting, leg press, and aerobic capacity tests in professional Greek soccer players [ 9 ]. Alimoradi et al, (2019) also recorded a positive correlation between higher vitamin D concentration and improvements in sprint and leg press tests in a group of Iranian soccer players supplemented with vitamin D in comparison with players who were not supplemented [ 20 ]. Conversely, Ksiazek et al, (2016) did not find an association between vitamin D levels and lower limb muscle strength in professional soccer players [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Associations of Vitamin D Levels with Physical Fitness and Motor Performance; A Cross-Sectional Study in Youth Soccer Players from Southern Croatia

Gilić

Kosor

Jiménez-Pavón

et al. 2021

Biology

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Vitamin D level is known to be a factor potentially influencing physical fitness, but few studies have examined this phenomenon among youth athletes. We aimed to evaluate the associations of vitamin D levels (as measured by 25-hydroxyvitamin D concentrations—25(OH)D) with various physical fitness and motor performance tests in youth football (soccer) players. This cross-sectional study included a total of 52 youth soccer players (15.98 ± 2.26 years old) from Southern Croatia. The participants were evaluated at the end of the winter period and data were collected of anthropometric measures (body mass and body height), vitamin D status (25(OH)D levels), physical fitness tests (sprints of 10 and 20 m, 20 yards test, the countermovement jump, the reactive strength index (RSI)) and motor performance tests (the soccer-specific CODS, the soccer-specific agility, and static balance). Among the studied players, 54% had 25(OH)D insufficiency/deficiency, showing a lack of 25(OH)D is widespread even in youth athletes living at a southern latitude. The 25(OH)D level was correlated with sprint 20 m, 20 yards tests, and RSI, showing a greater role of 25(OH)D in physical fitness tests where energetic capacity is essential than in sport-related motor performance tests where skills are crucial. Our results support the idea that vitamin D can play a determinant role in physical fitness tests with a clear physiological component, but is not crucial in motor performance tests related to specific sports where skills are a key component. Future studies should investigate the effects of vitamin D supplementation on the performance in physical fitness and motor performance tests among youth athletes.

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“…The subject group received 50,000 IU vitamin D weekly and the control group did not receive any vitamin D supplementation. After the study of 8 weeks, they stated as the result of the study that weekly vitamin D supplementation caused an increase in calcifediol in the blood circulation and this increase improve the strength and speed performance of the subject group (Alimoradi et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Analyzing the Effect of 25-Hydroxy Vitamin D Level on Strength and Endurance in Male Wrestlers

Baikoğlu¹

2020

JEL

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90–95% of vitamin D which has the supreme function of regulating many metabolisms in tissues and organs, is taken from the sunlight through skin. Since wrestling is performed in sun-protected sports halls, we think that a vitamin D replacement will improve the performance of wrestlers, especially as the limited exposure to sunlight is compared to outdoor sports branches. The aim of our study is to increase the strength and endurance of male wrestlers by applying 25-Hydroxy vitamin D replacement together with general and wrestling-specific trainings for 8 weeks. 36 wrestlers participated in the study and were divided into two groups as subject and control groups. Group A (n: 18) was the exercise-subject group with a 25-hydroxy vitamin D replacement and group B (n: 18) was the exercise-control group without the vitamin D replacement applied. In the subject group, Devit-3 oral ampoule 1 ml (300,000 I.U.) replacement was applied to the wrestlers whose 25-hydroxy vitamin D levels were below 20 ng/mL. Wrestlers were pre-tested one week before the replacement. After 8 weeks, they were post-tested and their vitamin D levels were measured again. Wrestlers in the control group were tested at the beginning and end of the 8-week training program without the vitamin D supplementation. In the analysis of the data, a Wilcoxon test and Mann Whitney test (one of the nonparametric tests) was used in accordance with the distribution width when the averages of the groups were evaluated in terms of significance with each other. The values that were p < 0.05 as the significance level of the data were accepted as statistically significant and the evaluations were made accordingly. When the results of the analysis were examined, it was seen that 25-hydroxy vitamin D levels of the wrestlers increased from 13.85 ng/ml to 26.28 ng/ml after the replacement applied to the wrestlers in the subject group. It was observed that while vitamin D levels of the group increased, their aerobic endurance decreased to 132.22 ± 9.69 from 150.33 ± 20.98 (p < 0.05). Thus, their aerobic endurance improved statistically significant. No statistically significant value was obtained in the test analysis of the wrestlers in the control group. The analysis results obtained from the study showed that the 25-hydroxy vitamin D levels in athletes increased and their aerobic capacity also increased after vitamin D induction. It is possible to say that vitamin supplementation together with 8 weeks training program is more effective for athletes to improve their strength and endurance.

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Efficacy of Vitamin D supplementation in physical performance of Iranian elite athletes

Cited by 17 publications

References 46 publications

Nutrient Intake of Wildland Firefighters During Arduous Wildfire Suppression

Nutrient Intake of Wildland Firefighters During Arduous Wildfire Suppression

Associations of Vitamin D Levels with Physical Fitness and Motor Performance; A Cross-Sectional Study in Youth Soccer Players from Southern Croatia

Analyzing the Effect of 25-Hydroxy Vitamin D Level on Strength and Endurance in Male Wrestlers

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