If you are starting, or are getting back into it after a long break, you will likely find that you are building more muscle than losing fat at first. This is because your body is not yet efficient at using fat as a fuel source, and because of this the body relies more on glycogen (stored carbohydrate) and protein for energy. As you become fitter, your body will become better at using fat as fuel, and you will start to see more fat loss.
Of course, the type of run you do will also affect how much fat and muscle you develop. A long, slow-distance run will tend to use more fat than a short, fast sprint. However, you will also burn more calories with a longer run. So, it is important to find a balance that works for you.
If you are wanting to burn more fat, you should aim for a lower-intensity run that you can sustain for long periods (ie: 60 minutes). However, if you are trying to build more muscle, then short, high-intensity intervals may be more effective.
Ultimately, the best way to see results is to mix up your running routine and find what works best for you.
Source: sportcoaching.co.nz
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