Neuromuscular Variables and Performance in Mexican Weightlifters
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Isometric start position pull (ISPP), Vertical impulse, Performance.
- Who it may be relevant to
- Registry conditions: Isometric Muscle Strength, Jumping Performance, Weightlifting, Performance Measures. Basic parameters: 13 years — 23 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Mexico
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Official title
Association Between Neuromuscular Variables and Competitive Performance in Weightlifting: an Observational Study With Mexican Athletes [The Kraft Project]
Overview
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.
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)
Interventions
- 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)
Primary outcome measures
- Isometric start position pull (ISPP) [Time frame: <5 minutes]
- Vertical impulse [Time frame: <5 minutes]
- Performance [Time frame: <1 minutes]
Eligibility criteria
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.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Observational model
- Other
Study locations
Mexico · 1 center
- Hotel María Dolores — San Luis Potosí City
Publications
- Joffe SA, Chavda S, Gilham J, Sandercock GRH, Tallent J. A comparison of maximal isometric force in the first pull, transition and second pull of the clean and their contribution to predict performance in national and international level weightlifters. Sports Biomech. 2026 Feb;25(2):281-297. doi: 10.1080/14763141.2025.2458478. Epub 2025 Jan 30. PMID 39882780
- Soriano MA, Flores FJ, Alonso-Aubin DA, Garcia-Sanchez C, Ceniza-Villacastin JA, Jimenez-Ormeno E, Lama-Arenales J, Comfort P. Associations Between Maximum Isometric Strength and Weightlifting Performance in Youth Weightlifters. J Strength Cond Res. 2025 May 1;39(5):570-578. doi: 10.1519/JSC.0000000000005052. PMID 40266638
- Vizcaya FJ, Viana O, del Olmo MF, Acero RM. Could the deep squat jump predict weightlifting performance? J Strength Cond Res. 2009 May;23(3):729-34. doi: 10.1519/JSC.0b013e3181a04dc3. PMID 19387408
Identifiers
NCT: NCT07277335 · Kraft2025_DBSS · Kraft2025_DBSS