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The rates of oxygen consumption and motility of washed sperm from the cauda epididymidis of the mouse declines steadily during the course of three or more hours. The decrease can be prevented by including an oxidizable substrate in the medium. Of the substrates usually included in media in which sperm are incubated, pyruvate and lactate were equally effective in maintaining respiratory rate and motility at maximal levels; glucose or fructose increased respiration only slightly, although motility was maintained by the hexose sugars as well as when pyruvate or lactate were present. Presumably then, the production of ATP by aerobic glycolysis provides the energy necessary for motility.  Both the rate of oxygen consumption and the level of motility are positively correlated with the partial pressure of oxygen in the medium. Motility, at a level about 20% of maximum, persists when oxygen consumption ceases due to oxygen lack. This occurs even though the medium contains no glucose. The most plausible explanation of this is that endogenous sources contribute to the production of energy.

Oxygen consumption and motility of mouse sperm as affected by oxidizable substrates and oxygen tension