Association of Vitamin D Supplementation in Cardiorespiratory Fitness and Muscle Strength in Adult Twins: A Randomized Controlled Trial.

Although vitamin D is related to cardiorespiratory fitness and muscle strength, there is no evidence in the literature about the genetic influence of the response to vitamin D supplementation and improvements in these parameters. Therefore, we evaluate the effect of longitudinal supplementation of vitamin D on parameters of physical fitness in monozygotic twins. In total, 74 participants were included, with a mean age of 25 years, divided into two groups, one group received supplementation with cholecalciferol for 60 days and the other group did not. Cardiorespiratory fitness and muscle strength were measured before and after supplementation through maximal treadmill tests and dynamometry, respectively. Wilcoxon tests were used to compare intragroup results and the Mann-Whitney test to examine intergroup differences. There was an increase in the serum concentration of vitamin D in participants who ingested the supplementation. Cardiorespiratory fitness improved after supplementation through increases in the values of maximum oxygen consumption of 28% (p < .001). Muscle strength in left hand grip increased 18% in participants who received the supplement (p = .007). Sixty days of cholecalciferol supplementation improved cardiorespiratory fitness and upper limb muscle strength.

Relação da idade óssea com antropometria e aptidão física em jovens praticantes de voleibol / Relationship of age with bone and fitness anthropometry practitioners in youth volleyball / Relación de edad ósea con antropometría y condición física en jugadores jóvenes de vóleibol

Resumo O estudo teve como objetivo correlacionar a idade óssea, os componentes antropométricos e a aptidão física em 149 crianças de 8 a 14 anos. Foram aferidos estatura, massa corporal, perímetros de braço e de perna, perímetros de braço e de perna corrigidos, diâmetros bicristailíaco e biacromial, dobras cutâneas tricipital e perna, teste motores de agilidade, velocidade de membros superiores e força explosiva de membros inferiores e superiores e o exame de raios X de mão e punho para verificar maturação. Nos resultados, encontramos correlação positiva entre a idade óssea e as demais variáveis, com exceção das dobras cutâneas tricipital, de perna e teste de agilidade. Dessa forma, verificamos a influência da maturação sobre componentes antropométricos e motores. Assim, possibilitamos uma melhor forma de controle dos processos de detecção, seleção e orientação esportiva.

Abstract The study aimed to correlate bone age, anthropometric measurements and physical fitness in 149 young volleyball players between ages 8 and 14. Height, weight, arm and leg circumferences, adjusted arm and leg circumferences, bi-iliac and biacromial breadths, tricipital and leg skin fold thicknesses, physical fitness tests, coordination and explosive strength of the upper and lower limbs were measured, in addition to x-rays of hand and wrist to check for maturation. Results showed positive correlation between bone age and all other variables, except tricipital skinfold, leg skinfold and agility. We concluded that maturation has influence on anthropometric and motor components, leading to a better control in the process of selecting and promoting young athletes.

Resumen El estudio tuvo como objetivo observar la correlación entre edad ósea, variables antropométricas y condición física en 149 niños de 8 a 14 años. Se midieron la estatura, la masa corporal, la circunferencia del brazo y de la pierna, la circunferencia corregida del brazo y de la pierna, el diámetro bi-cresta ilíaca y biacromial, y el pliegue cutáneo del tríceps. Se hicieron pruebas motoras de agilidad de las piernas, de velocidad de los miembros superiores y de fuerza explosiva de los miembros superiores e inferiores, y se hicieron radiografías de la mano y el puño para verificar la maduración. En los resultados se encontró una correlación positiva entre la edad ósea y otras variables, con la excepción del pliegue cutáneo del tríceps y la prueba de agilidad de las piernas. Por tanto, se observa la influencia de la maduración de las variables antropométricas y motoras, lo que permite una mejor manera de controlar los procesos de detección, selección y orientación deportiva.