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Sled training vs. sprints: which boosts runner performance more?

NCT ID NCT06729138

Knowledge-focused Sponsor: University of Cadiz Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at 80 runners to see if adding resisted sprint training with a sled (pulling a weight) improves running economy, speed, and biomechanics more than regular sprint training alone. Participants trained twice a week for eight weeks. The goal is to find better ways for distance runners to train.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Resisted sprint training using a sled
What this could lead to
If it works, this could help coaches and runners choose better training methods to improve running economy and speed.
What could go wrong
This is a small, completed study with only 80 runners from one region, so results may not apply to all runners. It measures performance markers, not real race outcomes.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

80 people

The number who actually took part.

Started

Apr 2025

Finished

Aug 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 35 years

Sex

Male participants only

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * At least 2 years of training experience as a runner. * Do more than 30 kilometres per week. * Perform at least 3 training sessions per week. * Have competed in a 10km race or longer distance in the last 6 months. * Be between 18 and 35 years old. * Availability to attend the proposed training sessions. Exclusion Criteria: * Have a musculoskeletal injury or have had a musculoskeletal injury in the 6 months prior to the start of the study. * Have chronic diseases. * Have a BMI over 24.9. * Combine training and competition in other disciplines other than running.

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Performance enhancing

Contacts and locations

Locations

  • CD Atletismo Bahía de Cádiz

    Cadiz, Andalusia, 11012, Spain