Results Bone mass loses over 25% relative to premenopause when the load descends 20% due to fall of muscular strength and decrease of activities after menopause.

• 结果妇女绝经后，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，骨量相对于妇女绝经前丢失25%25以上，产生骨质疏松。