The Effects of Individualised Short-term Sleep Restriction on Tactical Performance

NCT ID: NCT06912256

Last Updated: 2025-04-04

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 16 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2023-05-01
• Study Completion Date: 2023-12-31

Brief Summary

The goal was to evaluate the influence that chronic sleep restriction may have on football players tactical performance during small-sided games. By using a relative sleep restriction (i.e., by reducing the normal sleep duration by 15%) instead of an absolute sleep restriction (e.g., 3-4 hours), different sleep schedules were applied, according to the players individual sleep profile. It was hypothesized that the player's performance would be impaired, particularly their tactical behaviors when performing a 4x4 small-sided game format.

Detailed Description

An impairment on cognitive and physical performance is commonly suggested in literature. However, there is a lack of information regarding sport-specific parameters. Thus, the present study aimed to examine whether chronic sleep restriction during 9 consecutive days impairs the tactical performance of football players during small-sided games (SSGs). A total of sixteen national level male football players wore wrist actigraphy units during night sleep throughout the study. Players were randomized into two groups: intervention (IG), and control (CG). The first four days corresponded to a familiarization period, where players were informed about the study procedures and started using wrist actigraphy. Throughout the next seven consecutive days, the characterization phase of sleep players profile (i.e., baseline) was collected and analyzed. Then, players entered the intervention phase, where the IG slept 15% less than routine. During this 9-days period, players performed a 4x4 SSGs in two moments (moment 1 and moment 2) with a week interval. The SSGs were recorded using a video camera and subsequently analyzed using the Game Performance Assessment Instrument.

Conditions

Sleep Restriction

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: BASIC_SCIENCE
• Blinding Strategy: NONE

Study Groups

Sleep restriction

During the intervention period (i.e., 9 consecutive days), the intervention group started the sleep protocol, sleeping only the quantity of hours defined for their individual chronic partial sleep restriction (15% of usual daily sleep hours). The amount and quality of sleep obtained were daily monitored through actigraphy devices, and all the players filled in a sleep diary when they woke up. During this period, players performed the SSGs in two different moments (moment 1 and moment 2), interspersed by 4 days.

Group Type: EXPERIMENTAL

Sleep restriction

Intervention Type: BEHAVIORAL

During the intervention period (i.e., 9 consecutive days), the intervention group started the sleep protocol, sleeping only the quantity of hours defined for their individual chronic partial sleep restriction (15% of the usual sleep time). The amount and quality of sleep obtained were daily monitored through actigraphy devices, and all the players filled in a sleep diary when they woke up. During this period, players performed the SSGs in two different moments (moment 1 and moment 2), interspersed by 4 days.

Controls

Same intervention (i.e., soccer training and tests) as the other arm, but with no sleep restriction.

Group Type: NO_INTERVENTION

No interventions assigned to this group

Interventions

Sleep restriction

During the intervention period (i.e., 9 consecutive days), the intervention group started the sleep protocol, sleeping only the quantity of hours defined for their individual chronic partial sleep restriction (15% of the usual sleep time). The amount and quality of sleep obtained were daily monitored through actigraphy devices, and all the players filled in a sleep diary when they woke up. During this period, players performed the SSGs in two different moments (moment 1 and moment 2), interspersed by 4 days.

Intervention Type: BEHAVIORAL

Eligibility Criteria

Inclusion Criteria

• Soccer players classified as Tier 3, corresponding to the National Level in accordance to McKay et al. (2022), as they represented the under-19 team playing in the Portuguese National Championship 1st Division.

Exclusion Criteria

• 1) players with previously identified sleep disorders;
• 2) players with injuries that prevented them from playing SSGs.

• Maximum Eligible Age: 19 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: Yes

Sponsors

José Afonso Coelho Neves

OTHER

Sponsor Role: lead

Responsible Party

José Afonso Coelho Neves

Supervisor of the lead author's Master Thesis

Responsibility Role: SPONSOR_INVESTIGATOR

Locations

Faculty of Sport, University of Porto

Porto, Porto District, Portugal

Countries

Portugal

Other Identifiers

CEFADE 9 2023

Identifier Type: -

Identifier Source: org_study_id