Vitamin D Supplementation Does Not Enhance Gains in Muscle Strength and Lean Body Mass or Influence Cardiorespiratory Fitness in Vitamin D-Insufficient Middle-Aged Men Engaged in Resistance Training

维生素D补充剂并不能增强维生素D缺乏的中年男性在进行阻力训练时的肌肉力量和瘦体重增长，也不能改善其心肺功能。