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The most distinct type of fibre. They had small diameters, long twitch durations, low peak forces and were highly resistance to fatigue (see figure 2). Biochemically, these fibers were found to be high in oxidative enzymes, but low in glycolytic markers and ATPase activity. These have been termed slow fibres, sometimes SO for slow oxidative. These fibres also contain high concentrations of myoglobin which can help to buffer oxygen levels during periods of more extreme exercise. The small diameter of these fibres may be an adaptation to aid diffusion (absorption of oxygen and loss of carbon dioxide).
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