Diaz, A., Otto, R. M., Kushner, C., Marra, J., Walsh, L., Richardson, C., & Wygand, J. W. (2008). The impact of 10 weeks of independent cycle crank use on run performance. ACSM 55th Annual Meeting Indianapolis, Presentation Number 1293.

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This study evaluated the effect of 10 weeks of independent cycle crank training on run performance as measured by oxygen-use efficiency, time trial performance, and leg strength. Triathletes (M = 16; F = 14) participated in familiarization and test trials involving leg strength (leg extension and flexion), a treadmill-based steady state oxygen-use efficiency trial, and a 5 K time trial. Testing was performed during the familiarization trial, pre-test (within one week) and the post-test (10 weeks later). After the pre-test trial, Ss were randomly assigned to one of three groups (control, 90 minutes per week, and 180 minutes per week of independent cycle crank training). For 10 weeks all Ss exercised (swim, cycle, run) a minimum of eight hours per week completing minimum work loads in running and independent cycle crank training.

There were no significant differences between groups or pre-post changes within groups, except the 90 minutes per week group significantly improved oxygen-use efficiency in running efficiency.

Implication. Independent cycle crank training does not improve running performance therefore supporting the Principle of Specificity of Training.

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