On gross examination, felid muscle appeared white in color with red pigment primarily absent. Already this indicated that the muscle may contain a large proportion of fast twitch glycolytic fibers. A clear distinction between the human and feline muscles was the predominance of type IIx and low proportions of types I and IIa fibers in the latter, whereas types I and IIa fibers were more predominant in humans. This is consistent with previous studies on felids and human endurance runners