By Dr. Mercola
After a vigorous workout, the muscles in your legs and arms may be fatigued and possibly sore. But have you ever wondered why your heart, which is also a muscle, doesn't feel similarly "tired"? The reason has to do with the three different types of muscle – skeletal, smooth, and cardiac -- and how they derive energy from your body.
After a vigorous workout, the muscles in your legs and arms may be fatigued and possibly sore. But have you ever wondered why your heart, which is also a muscle, doesn't feel similarly "tired"? The reason has to do with the three different types of muscle – skeletal, smooth, and cardiac -- and how they derive energy from your body.
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