Vitamin D and physical fitness in Qatari girls

Racinais, Sébastien; Hamilton, Bruce; Li, C K; Grantham, Justin

doi:10.1136/adc.2009.163238

Cited by 24 publications

(21 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides PA, 25(OH)D also impacted on endurance of adolescents aged 11 years or older, with higher endurance levels for a more adequate supply of serum concentrations of 25(OH)D. This agrees with earlier findings where schoolgirls aged 9–15 years with severe vitamin D deficiency had a significantly lower level of fitness (V o 2max ) than the non-deficient group [47]. Another study revealed that among 54 healthy young females better cardiorespiratory fitness (V o 2max ) was associated with higher serum 25(OH)D level [39].…”

Section: Discussionsupporting

confidence: 82%

Predictors of Differences in Vitamin D Levels in Children and Adolescents and Their Relation to Endurance Performance

Lämmle

Bergmann²,

Bös

et al. 2012

Ann Nutr Metab

View full text Add to dashboard Cite

Aims: The present study investigated whether sociodemographic factors and physical activity (PA) are associated with differences in serum 25-hydroxyvitamin D [25(OH)D] levels and whether these differences are associated with varying levels of endurance performance and body mass index (BMI) in children and adolescents. Subjects and Methods: Path analyses were based on data of a nationwide, cross-sectional German Health Interview and Examination Survey for Children (KiGGS; 2003 until 2006) for 25(OH)D and the embedded ‘motor function module’ for PA and endurance performance. The data were collected from 3,437 children and adolescents aged 6–17 years clustered in three age groups: 6–10, 11–13 and 14–17 years. Results: PA is affected by socioeconomic status and (non-)immigration background, 25(OH)D is only affected by (non-)immigration background and only in childhood. PA and 25(OH)D were not associated in those aged 11–13 years. In adolescence, lower 25(OH)D levels are associated with lower endurance performance and a higher BMI. Conclusions: Our results did not reveal a universally significant effect of sociodemographic factors on 25(OH)D. The association between 25(OH)D and endurance performance might reflect the effects of 25(OH)D on muscle function. Predictors of 25(OH)D status other than sunlight exposure and its health effects in the pediatric age group should be explored further.

show abstract

Section: Discussionsupporting

confidence: 82%

Predictors of Differences in Vitamin D Levels in Children and Adolescents and Their Relation to Endurance Performance

Lämmle

Bergmann²,

Bös

et al. 2012

Ann Nutr Metab

View full text Add to dashboard Cite

show abstract

“…Moreover, this micronutrient deficiency has been well documented across the entire Middle East and the developing world (16,(29)(30)(31)(32)(33) . However, no such cohort of female out-patients was investigated previously.…”

Section: Discussionmentioning

confidence: 99%

Year-round vitamin D deficiency among Saudi female out-patients

Kanan

Saleh

Fakhoury

et al. 2012

Public Health Nutr.

View full text Add to dashboard Cite

AbstractObjectiveThe aim of the present study was to investigate vitamin D status among female out-patients in Saudi Arabia during the summer and winter seasons.DesignData were retrospectively collected using medical record abstraction.SettingA multidisciplinary hospital in Riyadh between January and December 2009.SubjectsSaudi females (age ≥19 years;n1556) attending out-patient clinics for various complaints comprised the studied population. The population was subdivided into two groups depending on the date of their visit where blood samples were collected: summer (n659) and winter groups (n897). The summer group was further subdivided into premenopausal (age 19–49 years;n425) and postmenopausal subgroups (age ≥50 years;n234). Similarly, the winter group was subdivided into premenopausal (n543) and postmenopausal subgroups (n354). Serum levels of 25-hydroxyvitamin D (25(OH)D) were measured using HPLC.ResultsThe prevalence of vitamin D deficiency (25(OH)D <50 nmol/l) was high in both premenopausal and postmenopausal groups (80 % and 68 %, respectively) during the summer, as well as during the winter (85 % and 76 %, respectively).ConclusionsA high prevalence of vitamin D deficiency among Saudi female out-patients was observed throughout the year despite the routine supplementation with 10–20 μg vitamin D3for postmenopausal women. Clinicians should seriously consider determining the vitamin D status of Saudi females routinely and prescribing them proper supplementation.

show abstract

“…The original variable "blood drawing date" was used to compute seasonality similarly to previous studies (27): Winter (1; January through March), Spring (2; April through June), and Autumn (3; October through December). Blood drawing was performed during the academic year.…”

Section: Methodsmentioning

confidence: 99%