Since the decreases of the muscle strength and the physical activities lead to reducing loads about 20% and lossing bone mass about 25%.

• 当妇女绝经后,由于肌肉力量的降低和活动量的减少而导致外载荷下降20%25时,骨量相对于绝经前丢失25%25以上,证明了力学因素在预防和治疗骨质疏松中的重要作用。