Fast and Slow twitch muscles fibres – what does this mean?
Basically, there are two types of muscles fibres. The slow twitch fibres (mainly the red meat) contract slowly and can keep going for a long time. Marathon runners have more of this type of muscle fibres. They need a good blood supply because they need a good supply of oxygen from the blood to produce the energy they need to fuel them.
Fast twitch (mainly the white meat) contract quickly but tire rapidly. Sprinters would have more of this type of fibre. As the bursts of energy will be short-lived oxygen isn’t needed to help fuel them and so they don’t need a rich blood supply.
In reality, most muscles have a mixture of the two types of muscle fibres. The exceptions are the soleus deep in the calf and the muscles in your back involved in maintaining posture. These are mainly slow twitch. The muscles responsible for eye movement are predominantly fast twitch.
The way I remember it is the cow in the field sedately wandering around grazing and chewing the cud. Her meat is red. The chicken dashing and fluttering around has mainly white meat.
The core is slow twitch and we need to train it for endurance. That is what it is designed for but like any muscles group, it does need training. We couldn’t all go out and run a marathon just like that, could we? So we had better keep planking to increase the endurance of our powerhouse that helps keep us strong supporting us from the inside out.