Schaetzmueller, V., Weber, S., Woestmann, R., Lopez, C. M., & Platen, P. (2005). Effects of constant versus stochastic training patterns on development of endurance performance in running. Medicine and Science in Sports and Exercise, 37(5), Supplement abstract 248.

Endurance runners (N = 14) were divided into a constant training group (training load, duration, and number of sessions per week did not vary) and a stochastic training group (duration and number of sessions per week varied). After four weeks, the total training load was equal for both groups. Running velocity was constant at 70% anaerobic threshold. The duration of training in the experiment was 13 weeks. Before and after the total training period, Ss performed an incremental treadmill test.

No physiological measures differed between groups. Running economy was significantly better in the constant group, while it declined in the stochastic group.

Implication. For performance to improve, training stimuli have to increase. Constant training only affects performance economy.

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