It appears that some transfer of training effects on VO2max exist from one mode to another. The training effect seems to be more noticeable when running is performed as a cross-training mode. Swim training, on the other hand, may result in minimum transfer of training effects on VO2max for other activities. Cross-training effects never exceed those induced by a specific training. The principles of specificity of training tend to have greater significance, especially for highly trained athletes. But even for these athletes cross-training may be an appropriate supplement during rehabilitation periods from physical injury or when suffering from mental distress (Tanaka, 1994, p. 337).
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