It is interesting that the decrease in elastic recoil of the lungs and progressive stiffening of the chest wall serendipitously counteract each other with no net significant change in absolute FRC.

• 有趣的是，肺弹性回缩力的减少和进行性的胸壁僵硬相互抵消使绝对肺功能残气量没有多大变化。