As noted, we lose muscle mass with age. Especially quick to deteriorate are fast-twitch muscle fibers, which power quick, explosive movements.
如上而言，随着年纪的增大我们的肌肉会失去力量，尤其是快速收缩的肌肉纤维更为明显，这部分纤维让我们跑得快，启动有爆发力。
We have two basic types of muscle fibers, slow twitch and fast twitch.
我们每个人有两种基本的肌肉纤维，慢抽搐和快抽搐肌纤维。
We have two basic types of muscle fibers, slow twitch and fast twitch.
我们每个人有两种基本的肌肉纤维，慢抽搐和快抽搐肌纤维。
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