The cross-training (XT) hypothesis suggests that despite the principle of specificity of training, athletes may improve performance in one mode of exercise by training using another mode. To test this hypothesis we studied 30 well-trained individuals (10 men, 20 women) in a randomized longitudinal trail. Subjects were evaluated before and after 8 weeks of enhanced training (+10%/week), accomplished by adding either running (R) or swimming (XT) to baseline running, versus continued baseline running (C). Both R ( − 26.4s) and XT (− 13.2s) improved time trial (3.2 km) performance, whereas C did not (− 5.4s). There were no significant changes during treadmill running in maximum oxygen uptake (O2peak; − 0.2, − 6.0, and + 2.7%), steady state submaximal O2 at 2.68 m · s−1 ( − 1.2, − 3.3 and + 0.2 ml · kg−1 · min−1), velocity at O2peak (+0.05, +0.25 and +0.09 m · s−1) or accumulated O2 deficit (+ 11.2, − 6.1 and + 9.4%) in the R, XT or C groups, respectively. There was a significant increase in velocity associated with a blood lactate concentration of 4 mmol · l−1 in R but not in XT or C ( + 0.32, + 0.07 and + 0.08 m · s−1). There were significant changes in arm crank O2peak ( + 5%) and arm crank O2 at 4 mmol · l−1 ( + 6.4%) in XT. There was no significant changes in arm crank O2peak ( + 1.3 and − 7.7%) or arm crank O2 at 4 mmol · l−1 ( + 0.8 and + 0.4%) in R or C, respectively. The data suggest that muscularly non-similar XT may contribute to improved running performance but not to the same degree as increased specific tranining.
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Foster, C., Hector, L.L., Welsh, R. et al. Effects of specific versus cross-training on running performance. Europ. J. Appl. Physiol. 70, 367–372 (1995). https://doi.org/10.1007/BF00865035
- Oxygen deficit