Neuromuscular Variables and Performance in Mexican Weightlifters (KRAFT)

December 9, 2025 updated by: Ángel Rodríguez

Association Between Neuromuscular Variables and Competitive Performance in Weightlifting: an Observational Study With Mexican Athletes [The Kraft Project]

This study aims to determine whether, within each weight and sex category, higher isometric pull force or greater vertical jump impulse is associated with better final placement in the competition.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This cross-sectional observational study will be conducted during the 2025 "El Pavo" National Tournament, held in San Luis Potosí, Mexico, with athletes officially registered with the Mexican Weightlifting Federation (FMLP). Vertical jump impulse will be assessed using the Deep Squat Jump (DSJ) approximately two hours after each athlete's last valid attempt, followed by the Isometric Pull Start Position (IPSP) test to measure isometric pull force. Competitive performance data-best Snatch (SN), Clean & Jerk (CJ), and Total (TOT)-will be obtained from official competition records, along with the athlete's final placement within their sex and body mass category.

The study will analyze athletes from two age groups (U-15 and Over-18) and both sexes, selecting one light and one heavy body mass division per group. The included divisions are: U-15, Female: -44 kg (light), -63 kg (heavy) and Male: -56 kg (light), -79 kg (heavy); Over-20, Female: -53 kg (light), -77 kg (heavy) and Male: -65 kg (light), -94 kg (heavy)

Study Type

Observational

Enrollment (Estimated)

50

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Mexico
    • San Luis Potosí
      • San Luis Potosí City, San Luis Potosí, Mexico, 78390
        • Recruiting
        • Hotel María Dolores
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

Weightlifters younger than 15 years old and older than 18 years old (up to 23 years), who will participate in the 2025 edition of the annual national tournament "El Pavo," organized by the Mexican Weightlifting Federation, will be evaluated

Description

Inclusion Criteria:

  • Weightlifters younger than 15 years old and older than 18 years old (up to 23 years), registered to compete in the 2025 "El Pavo" National Tournament with no declared health issues.

Exclusion Criteria:

  • Weightlifters registered for the 2025 "El Pavo" National Tournament who present any declared health issues.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Junior weightlifters younger than 15 years old
Other: Isometric start position pull (ISPP)
The participants' force production capacity will be assessed. The test will be conducted on a force platform. Each athlete will perform general and specific warm-up and familiarization with three isometric attempts with CJ grip (~50%, 80% and 100% perceived effort). For measurement, each participant will execute two 3-s maximum attempts with CJ grip, with 1 minute rest between efforts.
Other: Vertical impulse
A force platform will be used to measure the lower-limbs vertical impulse during a The Deep Squat Jump (DSJ). Participants will execute the DSJ without any countermovement, ensuring maintenance of the full squat position for 3-4 seconds before takeoff to avoid any contribution from elastic energy storage.
Other: Performance
Performance indicators will be obtained from official competition records, extracting the best valid loads in Snatch (SN), Clean & Jerk (CJ), and Total (TOT)
Elite weightlifters older than 18 years old (up to 23 years)
Other: Isometric start position pull (ISPP)
The participants' force production capacity will be assessed. The test will be conducted on a force platform. Each athlete will perform general and specific warm-up and familiarization with three isometric attempts with CJ grip (~50%, 80% and 100% perceived effort). For measurement, each participant will execute two 3-s maximum attempts with CJ grip, with 1 minute rest between efforts.
Other: Vertical impulse
A force platform will be used to measure the lower-limbs vertical impulse during a The Deep Squat Jump (DSJ). Participants will execute the DSJ without any countermovement, ensuring maintenance of the full squat position for 3-4 seconds before takeoff to avoid any contribution from elastic energy storage.
Other: Performance
Performance indicators will be obtained from official competition records, extracting the best valid loads in Snatch (SN), Clean & Jerk (CJ), and Total (TOT)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Isometric start position pull (ISPP)
Time Frame: <5 minutes
The participants' force production capacity will be assessed. The test will be conducted on a force platform
<5 minutes
Vertical impulse
Time Frame: <5 minutes
A force platform will be used to measure the lower-limbs vertical impulse during a The Deep Squat Jump (DSJ)
<5 minutes
Performance
Time Frame: <1 minutes
The final placement of each athlete in their category
<1 minutes

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Ángel Rodríguez

Investigators

  • Study Director: Diego A Bonilla, Research Division, Dynamical Business & Science Society-DBSS International SAS
  • Study Chair: Jorge L Petro, Research Division, Dynamical Business & Science Society-DBSS International SAS
  • Study Chair: Rodrigo D Merlo, PhD, Research Division, Dynamical Business & Science Society-DBSS International SAS
  • Principal Investigator: Ángel Rodríguez-Chávez, Mg, Research Division, Dynamical Business & Science Society-DBSS International SAS
  • Study Chair: Leoncio Moreno, Federación Mexicana de Levantamiento de Pesas
  • Study Chair: Shyam Chavda, London Sports Institute, Middlesex University, West Stand, Stone X Stadium, Greenlands Lane, London NW4 1RL, UK
  • Study Chair: Marcos A Soriano, Centre for Sport Studies, Rey Juan Carlos University, 28943 Madrid, Spain; miguel.delolmo@urjc.es

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

December 27, 2025

Primary Completion (Estimated)

December 30, 2025

Study Completion (Estimated)

December 31, 2025

Study Registration Dates

First Submitted

November 26, 2025

First Submitted That Met QC Criteria

December 9, 2025

First Posted (Actual)

December 11, 2025

Study Record Updates

Last Update Posted (Actual)

December 11, 2025

Last Update Submitted That Met QC Criteria

December 9, 2025

Last Verified

December 1, 2025

More Information

Terms related to this study

Other Study ID Numbers

  • Kraft2025_DBSS (Other Identifier: Innovation MX DBSS)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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