Comparison of Training Intensity Distribution Models in Recreational Distance Runners

This study aims to compare the effects of three different training intensity distribution (TID) models-polarized, threshold, and pyramidal-on physiological and performance adaptations in recreational distance runners. Twenty-four participants will be assigned to one of the three training interventions and will complete an 8-week structured running program based on the respective TID approach. The primary objective is to determine whether different TID models elicit distinct changes in key physiological markers and endurance performance. The study seeks to answer whether a specific intensity distribution strategy provides superior adaptations in recreational runners when training is prescribed over a controlled intervention period.

NCT Number	NCT07565168
Lead Sponsor	Universidad Rey Juan Carlos
Conditions	Endurance Exercise, Exercise Physiology, Running Performance
Enrollment	24 participants
Start Date	2024-04-01
Primary Completion	2024-07-30 (estimated)
Study Completion	2026-04-20 (estimated)
Updated on ClinicalTrials.gov	2026-05-11