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https://theathleteclinic.com/2012/12/21/ix-weeks-of-a-polarised-training-intensity-distribution-leads-to-greater-physiological-and-performance-adaptations-than-a-threshold-model-in-trained-cyclists/
IX WEEKS OF A POLARISED TRAINING INTENSITY DISTRIBUTION LEADS TO GREATER PHYSIOLOGICAL AND PERFORMANCE ADAPTATIONS THAN A THRESHOLD MODEL IN TRAINED CYCLISTS