Inter- and Intra-individual Variation in Acute Responses to Two Different Warm-up Types.

NCT04738617 | Withdrawn

• 1 other identifier: CEFADE 03 2021
• Study Type: interventional
• Target: N/A
• Locations: 1 country
• Sites: 1

Brief Summary

The goal is to assess inter- and intraindividual variation in response to different warm-up protocols in a randomized, cross-over study with U16 and U17 Portuguese soccer players.

Conditions

Healthy

Keywords

warm-up; potentiation; variability

Outcome Measures

Primary Outcomes (3)

• Linear speed

  Straight line sprinting (20-m linear sprinting test)

  Through study completion (8 weeks)

• Pre-programmed change-of-direction

  Illinois Agility Test (IAT) without ball and with ball (IATB)

  Through study completion (8 weeks)

• Lower limb power

  Countermovement jump height

  Through study completion (8 weeks)

Secondary Outcomes (1)

• Harms and/or side-effects

  Through study completion (8 weeks)

Study Arms (2)

Warm-up based on small-sided games

EXPERIMENTAL

Intervention A is based on football-specific small-sided games (SSGs), consisting of 4 versus 4 matches (with mini-goals), performed in a 30 m by 24 m court (Giménez et al., 2018), using five sets of 90 seconds of work interspersed with 30 seconds of pause, in a total duration of 10 minutes.

Behavioral: Inter and intra-individual variation in acute responses to two different warm-up types

Warm-up based on potentiation principles (e.g., speed, change of direction, plyometrics)

EXPERIMENTAL

Intervention B is based on speed, COD and plyometrics (i.e., a "potentiation" protocol), inspired by ideas presented by Howe, Coward, and Price (2017). Participants will perform five repetitions of the following exercises, in this order: unilateral hurdle hops and lateral hurdle hops with each lower limb; CMJ; broad jump; forward in and out; slalom jumps; lateral scissor jumps; single leg linear hops. Each intervention will last \~10 minutes and will be applied in the football field.

Behavioral: Inter and intra-individual variation in acute responses to two different warm-up types

Interventions

Inter and intra-individual variation in acute responses to two different warm-up types BEHAVIORAL

Comparison of the acute effects of two different warm-up protocols on subsequent performance.

Warm-up based on potentiation principles (e.g., speed, change of direction, plyometrics); Warm-up based on small-sided games

Eligibility Criteria

• Age: 14 Years - 17 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Child (0-17)

You may qualify if:

• Participants will be 40 to 50 healthy football players from the U16 and U17 teams of a club from the Oporto city, engaged in three weekly training sessions with an average weekly training volume of 270 minutes.

You may not qualify if:

• Following similar research (Beato, De Keijzer, et al., 2019), participants will have to be free from injuries or illness at the start of the study.

Sponsors & Collaborators

• Universidade do Porto: lead

Study Sites (1)

Boavista Futebol Clube

Porto, 4100, Portugal

Location

Study Officials

• José Afonso, Ph.D.

  Universidade do Porto

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: OUTCOMES ASSESSOR
• Masking Details: Testing will be blinded to the interventions and to the goals of the current research. Two external professionals, with a master's degree in Sports Science and experienced in collecting the data will be responsible for collecting the tests at all time points. In each test, they will be further blinded to the previous results. Additionally, two researchers will assist in operationalizing the tests; these researchers will be blinded to the participants' allocation, but not to the study's goals.
• Purpose: DIAGNOSTIC
• Intervention Model: CROSSOVER
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor

Model Details: Two weeks of familiarization with protocols and testing. Then, randomization with cross-over design. Two weeks of intervention, followed by two weeks of wash-out, followed by two weeks of intervention.

Study Record Dates

• First Submitted: January 30, 2021
• First Posted: February 4, 2021
• Study Start: January 1, 2023
• Primary Completion: April 1, 2023
• Study Completion: September 1, 2023
• Last Updated: May 9, 2023

Record last verified: 2023-05

Data Sharing

• IPD Sharing: Will not share

Locations

PT (1)