The myth is widespread: muscles burn fat or strength training promotes fat burning. The statements are in principle not wrong - but one must relativize these claims more.
Basically, muscles consume a certain amount of energy for their work - this is obvious. It is also clear that more energy is consumed with a larger volume of muscle. So if we use targeted strength training a muscle building effect, increases the overall energy of our body - but this does not have to go with a pure fat burning.
Because our body derives its energy from different sources. First and foremost, he always resorts to the food he has received. Only when this amount is no longer sufficient to meet its energy needs, he resorts to its reserves. For then fat burning will take place in the fat cells.
Fat burning with muscle work
The Iron Reserve taps the body very reluctantly, as it is intended for worse times. Also, the human organism usually gives carbohydrates priority. Because these are easier and faster to recycle. Only when the carbohydrate reserves in the body are exhausted, the progress of fat burning.
As a rule, both processes also run parallel during a strength training - both the fat burning and the utilization of carbohydrates. Often one process dominates the other during a sporting load. This depends on the type of load. Strength training with light weights over a longer period of time with dynamic movement patterns rather calls the aerobic metabolism on the plan.
The aerobic metabolism can be equated with the burning of fat. If the organism has sufficient oxygen available and is a moderate form of exercise with low energy requirements, it chooses fat burning. The aerobic metabolism proceeds slowly, but is much more effective than the anerobic metabolism (carbohydrates) - the body can release a larger amount of energy at the same starting position.
A strength training that includes strong and fast intensities draws its energy primarily from carbohydrates. Fat burning is less intense in this type of workout. However, this form of strength training promotes the much-vaunted afterburning effect. It is the higher and lasts longer, the stronger the load was.
Even in sleep, this can cause the activation of the muscles. If we reduce the intake of carbohydrates after a heavy load and close this gap with protein, for example, the fat burning process is in full swing. Well then: Guts Nächtle, as the Swabian would say.