De-training. The reason why traditional concepts of periodization don’t optimize sport performance. Also known as….periodization doesn’t work, standardization does.

“The current study investigated the effects of 8 weeks of strength-training cessation after 25 weeks of strength training on strength-and cycling-performance characteristics.”

“Elite cyclists were randomly assigned to either 25 weeks of endurance training combined with heavy strength training (3 × 4–10 RM, 1 to 2 days/wk) or to endurance training only. Thereafter, both groups performed endurance training only for 8 weeks, coinciding with the initial part of the competition season.”
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“During the 25-week preparatory period, endurance training combined with heavy strength training group had a larger positive impact on maximal isometric half-squat force, squat jump, maximal aerobic power, power output, and mean power…..than did endurance training only.”
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“Conversely, during the 8-week competition period endurance training combined with heavy strength training group had a reduction in squat jump, power output, and mean power compared with endurance training only group.”
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“The present findings suggest rapid decline of adaptations on termination of strength training during the first 8 weeks of the competition period in elite cyclists.”
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B.R. Rønnestad, et al
Impairment of Performance Variables After In-Season Strength-Training Cessation in Elite Cyclists
International Journal of Sports Physiology and Performance — Volume 11 #6 — September 2016 — page 727