Menu
Not yet recruiting NCT07552844

Effects of 8-Week CrossFit-Based Concurrent Training on Fitness, Body Composition, and Psychological Outcomes in Schoolchildren

No phase Interventional Children Crossfit Psychology, Child Physical Fitness

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: CrossFit training.
Who it may be relevant to
Registry conditions: Children, Crossfit, Psychology, Child, Physical Fitness. Basic parameters: 7 years — 11 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
Spain
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

Effects of an 8-Week CrossFit-Based Concurrent Training Program on Physical Fitness, Body Composition, and Psychological Outcomes in Schoolchildren: A Randomized Controlled Trial Protocol

Overview

This study examines the effects of an 8-week CrossFit-based concurrent training program in boys and girls aged 7 to 11 years, comparing an experimental group (n=15) with a control group (n=15). The aim is to assess changes in strength, cardiorespiratory fitness, body composition, and psychological variables such as anxiety, stress, and self-esteem, using field-based physical tests (CMJ, Course Navette, handgrip strength, etc.) and validated questionnaires. The study follows a randomized controlled trial design with pre- and post-intervention assessments. The experimental group will complete two weekly CrossFit sessions adapted for children, while the control group will maintain their usual routine without structured physical training. The hypothesis states that the intervention will significantly improve both physical performance and psychological well-being in the experimental group compared to the control group.

Detailed description

This study is a randomized controlled trial designed to examine the effects of an 8-week CrossFit-based concurrent training program on both physical fitness and psychological well-being in school-aged children (boys and girls aged 7 to 11 years). The sample will be drawn from a primary school in Córdoba (Spain) and will be randomly assigned to either an experimental group (n=15) or a control group (n=15).

The experimental group will participate in a supervised CrossFit Kids program, consisting of two weekly sessions of 50 minutes each. These sessions will include functional, age-appropriate high-intensity exercises structured into four parts: warm-up (mobility and games), strength work (technical and developmental exercises), metabolic conditioning (METCON), and a final cool-down or game-based activity. The control group will continue with their usual daily routine without any structured physical training during the intervention period.

The study will assess changes in physical fitness variables, including muscular strength (countermovement jump, handgrip strength, standing long jump, and medicine ball throw), cardiorespiratory fitness (Course Navette test, burpees, abdominal endurance tests, and step tests), and body composition indicators such as BMI, waist circumference, and waist-to-height ratio. In addition, psychological outcomes will be evaluated using validated instruments measuring state and trait anxiety (State-Trait Anxiety Inventory), daily stress (Children's Daily Stress Inventory) and self-esteem (Rosenberg Self-Esteem Scale).

Measurements will be taken before and after the intervention to compare intra- and inter-group changes. The study also explores potential relationships between improvements in physical fitness and psychological outcomes.

The main hypothesis is that participation in the CrossFit-based concurrent training program will lead to significant improvements in strength, endurance, body composition, and psychological well-being (reduced anxiety and stress and improved self-esteem) compared to the control group, highlighting the potential of this training approach as an effective and comprehensive intervention for children.

Interventions

  • Other CrossFit training
    The experimental arm will receive an 8-week concurrent training intervention based on a CrossFit program adapted for children, with a frequency of two 50-minute sessions per week. Each session will be structured into a warm-up (mobility exercises and games), strength training (technical and functional exercises), metabolic conditioning (METCON), and a cool-down phase. The program will be supervised by qualified professionals to ensure safety and proper execution of the exercises.

Primary outcome measures

  • Countermovement Jump Test (CMJ) - Explosive Strength Test [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • Standing Long Jump [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • Medicine Ball Throw Test [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • 20 m Shuttle Run Test (Course-Navette) [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • Plank Hold Time [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • Burpess [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • Step Test [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • State-Trait Anxiety Inventory for Children [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • Children's Daily Stress Inventory [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • Rosenberg Self-Esteem Scale [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
Secondary outcome measures (2)
  • Body composition [Time frame: Week 1 (Day 1), Week 8 (Day 16)]
  • Perceived Exertion [Time frame: Week 1 (Day 1), Week 8 (Day 16)]

Eligibility criteria

Inclusion criteria

  • Age: 7-11 years.
  • Students enrolled at CEIP Pablo García Baena (Córdoba).

For the experimental group:

  • Availability to attend the Triple XXX Box (Polígono Pedroches, C. los Alfareros, Parcel 119, 14014 Córdoba), where both assessments and training sessions will be conducted.
  • Availability to attend training sessions twice per week for the 8-week intervention period.
  • No participation in extracurricular physical activity prior to the start of the CrossFit program.

For the control group:

No participation in extracurricular physical activity. Informed consent signed by parents or legal guardians. No medical, psychological, or behavioral contraindications that would prevent participation in physical activity.

Exclusion criteria

  • Children with musculoskeletal injuries, diseases, or medical, psychological, or behavioral conditions that limit physical activity or interfere with the assessment of outcomes.
  • Inability or anticipated difficulty in regularly attending training sessions.
  • Refusal of parents or legal guardians to provide informed consent.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: Yes

Study design

Allocation
Non-randomized
Model
Parallel assignment
Masking
Open label
Primary purpose
Other

Study locations

Spain · 1 center
  • IMIBIC — Córdoba

Publications

  • Duran-Lopez N, Gomez-Garcia C, Ranchal-Sanchez A, Lucena-Jurado V, Moyano-Ortega V, Lara-Barahona Ostos A, Jurado-Castro JM. High-Intensity Functional Concurrent Training for Physical Fitness, Body Composition, and Psychological Outcomes in Schoolchildren: Protocol for a Randomized Controlled Trial. Sports (Basel). 2026 Jul 3;14(7):279. doi: 10.3390/sports14070279. PMID 42506821

Identifiers

NCT: NCT07552844 · SICEIA-2025-000408

Primary sources (government registries)

View this study on ClinicalTrials.gov ↗