Sleep RestrictionNCT06912256
The Effects of Individualised Short-term Sleep Restriction on Tactical Performance
A study testing Sleep restriction in people with Sleep Restriction, run by José Afonso Coelho Neves at 1 site in Portugal.
Trial 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… Read more about this study
- Who is it for?
- Ages Up to 19 years, men onlyHealthy volunteers can take part
- Conditions the study is for
- Sleep Restriction
- What is being tested?
- Sleep restriction
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 16 participants
- Where
- 1 sitePortugal
- Study dates
- 1 May 2023to 31 Dec 2023
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Up to 19 years
- Men only
- Healthy volunteers accepted
- Child, Adult
Who may be able to join
- 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.
Who cannot join
- 1) players with previously identified sleep disorders;
- 2) players with injuries that prevented them from playing SSGs.
Trial locations and contacts
1 site in 1 country.
Portugal1 site
Faculty of Sport, University of Porto
Porto, Porto District, 4200-450
About this study
Official title: Influence Of Individualized Two Weeks Mild Sleep Restriction On Tactical Performance During Small-Sided Games In National Male Under-19 Football Players: A Randomized Trial
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.
Read the 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
- Being tested
- Sleep restriction
- Keywords
- sleep restriction, performance, tactical, small-sided games, soccer
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Sleep restrictionBehavioural
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.
| Study group | Role | What they receive |
|---|---|---|
| Sleep restriction | Experimental | 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. Receives: Behavioral: Sleep restriction |
| Controls | No intervention | Same intervention (i.e., soccer training and tests) as the other arm, but with no sleep restriction. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Game Performance Assessment Instrument (GPAI)
According to study purposes, tactical performance was defined as the main variables. Tactical analysis was performed using the Game Performance Assessment Instrument (GPAI), a tool designed to evaluate the individual tactical behavior (Memmert \& Harvey, 2008; Oslin, Mitchell, \& Griffin, 1998). It consists of seven components, two of which are evaluated when the player has the ball and the remaining five when the player does not have the ball possession. For example, decisions made about what to do with the ball during the game, and motor skill execution were classified as appropriate/efficient or inappropriate/inefficient. The main index proposed by Oslin et al. (1998) was calculated: Game Performance (GP). Based on actions deemed appropriate or inappropriate, the final score can range from 0 to 100%, with higher values denoting better outcomes.
Measured: Applied once in week 1 and once again in week 2
Secondary outcomes (1)
Sleep efficiency
The objective sleep data was collected using three axial accelerometers (ActiGraph LLC wGT3X-BT, Pensacola, USA) placed on the non-dominant wrist. To analyze the wrist actigraphy data, the ActiLife LLC Pro software (v6.13.3, Pensacola, USA) was used with a sampling frequency of 50Hz and an epoch of activity counts of 60s. Sleep efficiency (SE, percentage of time in bed that was spent asleep; CV=7%) was determined using the Sadeh's algorithm.
Measured: Collected daily during the two weeks of the intervention
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted4 Apr 2025
- Study start1 May 2023
- Primary completion31 May 2023
- Study completion31 Dec 2023
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Sleep RestrictionStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 16 participants (actual)
Sponsor and investigators
- Lead sponsor
- José Afonso Coelho Neves
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor-investigator, José Afonso Coelho Neves, Universidade do Porto
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06912256
- Sponsor's protocol ID
- CEFADE 9 2023
- Status last verified
- Mar 2025
- First submitted
- 23 Mar 2025
- Last updated
- 4 Apr 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Sensitive data belonging to a club, so we only had permission to report the statistical treatment, but not sharing the IPD.
Study at a glance
From the registry record, last updated by the sponsor on 4 Apr 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Influence Of Individualized Two Weeks Mild Sleep Restriction On Tactical Performance During Small-Sided Games In National Male Under-19 Football Players: A Randomized Trial
- ClinicalTrials.gov ID
- NCT06912256
- Acronym / sponsor ID
- CEFADE 9 2023
- Conditions
- Sleep Restriction
- Keywords
- sleep restriction, performance, tactical, small-sided games, soccer
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 16 participants (actual)
- Lead sponsor
- José Afonso Coelho NevesUniversity, hospital or other
- Study start
- 1 May 2023 (actual)
- Primary completion
- 31 May 2023 (actual)
- Study completion
- 31 Dec 2023 (actual)
- First posted
- 4 Apr 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Study design
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Sleep restriction | Experimental | Behavioral: Sleep restrictionDuring 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. |
| Controls | No intervention | –Same intervention (i.e., soccer training and tests) as the other arm, but with no sleep restriction. |
Who may qualify
- Ages
- Up to 19 years
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult
Key inclusion criteria (1 listed)
- 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.
Key exclusion criteria (2 listed)
- 1) players with previously identified sleep disorders;
- 2) players with injuries that prevented them from playing SSGs.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Sleep restrictionDuring 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. | Behavioural | Sleep restriction |
Primary outcome
Game Performance Assessment Instrument (GPAI)
Time frame: Applied once in week 1 and once again in week 2
According to study purposes, tactical performance was defined as the main variables. Tactical analysis was performed using the Game Performance Assessment Instrument (GPAI), a tool designed to evaluate the individual tactical behavior (Memmert \& Harvey, 2008; Oslin, Mitchell, \& Griffin, 1998). It consists of seven components, two of which are evaluated when the player has the ball and the remaining five when the player does not have the ball possession. For example, decisions made about what to do with the ball during the game, and motor skill execution were classified as appropriate/efficient or inappropriate/inefficient. The main index proposed by Oslin et al. (1998) was calculated: Game Performance (GP). Based on actions deemed appropriate or inappropriate, the final score can range from 0 to 100%, with higher values denoting better outcomes.
1 secondary outcome
Sleep efficiency
Time frame: Collected daily during the two weeks of the intervention
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 4 Apr 2025.
- Individual participant dataSharing planned: No. Sensitive data belonging to a club, so we only had permission to report the statistical treatment, but not sharing the IPD.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Sleep restriction in people with Sleep Restriction, run by José Afonso Coelho Neves at 1 site in Portugal.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 4 Apr 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Portugal. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Game Performance Assessment Instrument (GPAI) (time frame: Applied once in week 1 and once again in week 2). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 4 Apr 2025.