Comparison of Training Intensity Distribution Models in Recreational Distance Runners

Summary

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.

Conditions

• Endurance Exercise
• Exercise Physiology
• Running Performance

Interventions

OTHER

Polarided training intensity distribution

This intervention consists of an endurance training program based on a polarized intensity distribution model. Training intensity is prescribed using an individualized five-zone system derived from physiological assessments (e.g., ventilatory thresholds and maximal oxygen uptake). The model is characterized by a high proportion of training performed at low intensities (Zones 1-2) and a smaller but meaningful proportion at high intensities (Zones 4-5), with minimal time accumulated at moderate intensities (Zone 3). This distribution aims to maximize adaptations by combining extensive low-intensity volume with targeted high-intensity stimuli.

OTHER

Threshold Training Intensity Distribution

Participants assigned to the threshold training group complete an 8-week structured endurance training program emphasizing a greater proportion of training at moderate-to-high intensities, particularly around the second ventilatory threshold. Training intensity is prescribed using an individualized five-zone model derived from baseline physiological assessments. A substantial portion of training is performed in intermediate zones (Zones 3-4), with comparatively less time spent at low (Zones 1-2) and high intensities (Zone 5). Training sessions are monitored via GPS-enabled sport watches to ensure adherence.

OTHER

Pyramidal Training Intensity Distribution

Participants assigned to the pyramidal training group perform an 8-week structured endurance training program characterized by a progressive decrease in training volume from low to high intensities. Training intensity is prescribed using an individualized five-zone model based on baseline physiological assessments. Most training is accumulated in low-intensity zones (Zones 1-2), with moderate amounts in intermediate zones (Zone 3) and smaller proportions at higher intensities (Zones 4-5), forming a pyramidal distribution. Training load and compliance are monitored using GPS-enabled sport watches.

Sponsors & Collaborators

• Universidad Rey Juan Carlos

  lead OTHER

Principal Investigators

• Arturo Casado, PhD · Universidad Rey Juan Carlos

Study Design

Allocation

RANDOMIZED

Purpose

OTHER

Masking

SINGLE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

60 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2024-04-01

Primary Completion

2024-07-30

Completion

2026-04-20

Countries

• Spain

Study Locations