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Fat stores in muscle FAT STORES IN MUSCLE
As well as depot and circulating stores of fatty acids, muscles can call on a more immediate source of fat for energy if required. This is in the form of fat droplets in the muscle tissue itself. Because of its physical proximity, this is probably the first store of fat that is tapped by the muscles once energy demands call on extra fat to help out. It makes sense then that well-trained athletes are able to utilise this source of fat much earlier and more efficiently than the non-trained (probably because of a higher level of LPL in trained muscle and because fat is channelled to muscle in preference to the adipocyte because it is used on a more regular basis). This may also help to explain, along with muscle catabolism, why well-trained endurance athletes tend to be very thin in the muscles which are not being used in their event—the upper body muscles of the marathon runner for example.
Of course, all this is just a cursory glance at what happens in the fat cell and in the muscle tissue. The process is much more complicated and to start to make sense of this, we need to examine the processes of lipogenesis and lipolysis separately.
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