Repeated exercise, or wasting, can change the way key genes work.

What's the first thing that comes to mind when you think about the words twitch and muscle? Spasms, perhaps. You'd hardly be alone in thinking that. But when it comes to fitness, it's most commonly ...

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Have you heard of fast-twitch and slow-twitch muscle fibers? These are the two types of muscle that are responsible for all your gains in the gym. And depending on how you train — and even your own ...

Runners usually talk about muscles in terms of quads, glutes, and hamstrings. Exercise physiologists, on the other hand, talk about muscles in terms of fast-twitch and slow-twitch--which is one reason ...

Researchers have identified the role of the large Maf transcription factor family in regulating fast twitch muscle fibers. A mouse model lacking Maf expression in the skeletal muscles exhibited a ...

Hypertrophy is the increase in size and volume of muscle cells through a specific type of resistance training. Trainers ...

Skeletal muscle is the type of muscle that controls movement. Problems with these muscles can be minor, life-threatening, or ongoing problems that make it hard to perform basic daily activities.