Question

You observe the following fiber type distribution in a young individual before and after training. (3 points)

PRE-TRAINING                               POST-TRAINING

I: 27%                                                I: 29%

I/IIa: 14%                                           I/IIa: 5%

I/IIa/IIx: 3%                                        I/IIa/IIx: 0%

IIa: 32%                                             IIa: 59%

IIa/IIx: 24%                                        IIa/IIx: 6%

IIx: 0%                                                IIx: 0%

What was the most likely training program completed?

Answer 1

The two types of skeletal muscle fibers are slow-twitch (type I) and fast-twitch (type II). Slow-twitch muscle fibers support long distance endurance activities like marathon running, while fast-twitch muscle fibers support quick, powerful movements such as sprinting or weightlifting.Fast-twitch type II muscle fibers are further divided into Type IIx and Type IIa.

Here, we can see before training Type I is 27% and after training it is increased to 29% and also Type IIa has also increase after training. So this will occur after the Resistance training.

Resistance training increases the size of both type I and type II muscle fibers. Greater growth (i.e., hypertrophy) occurs in type II fibers and increases actin and myosin filaments. This results in an increased ability to generate force.