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Theorized recruitment of motor units as a function of swimming speed at (a) 10°C and (b) 20°C. Aerobic fibres, shaded motor units 1–3; anaerobic fibres, unshaded motor units 4–10. This schematically illustrates the compression of the recruitment order, and that all the aerobic fibres are recruited at a lower speed at 10°C, thus causing recruitment of the white muscle and rapid fatigue. Adapted from Rome (1990).
