Effects of Sleep Restrictions on Maximal Strength, Muscle Power, and Strength Endurance in Resistance-trained Women.

Effects of One Night's Acute Sleep Restrictions on Maximal Strength, Muscle Power, and Strength Endurance in Resistance-trained Women.

The study aims to see how acute sleep restriction will affect women resistance trainers. Above all, the investigators will be interested in observing the relationship between shorter sleep and athletic performance, as well as other important aspects, such as their level of motivation to exercise, how much pain participants felt during exercise and how demanding they found exercise. The investigators assume that differences in subjective measures (such as pain levels, motivation and mood) will be most apparent.

Study Overview

• Status: Enrolling by invitation
• Conditions: Sleep; Sleep Restriction
• Intervention / Treatment: Procedure: Sleep restriction

Detailed Description

Participants would take part in two identical experimental sessions under two sleep conditions:

with sleep restrictions (SR), where will experience acute sleep restriction the night before the test session (i.e., 3 h of early sleep restriction versus normal sleep); with the control condition (CON), where participants will follow their habitual sleep-wake routines.

Every session would separated by a 1-week interval. The average sleep duration (CON) is going to be estimated by using actigraphy Motionwatch 8 for 5 days (from Monday to Friday).

Female athletes will receive accelerometers one day before experimental sessions. Participants will be asked to wear them on their non-dominant wrists from 8 p.m. to the next morning (experimental sessions day).

The participants would complete the morning session with a battery of physical tests, measuring several components of specific physical performance capacity and cognitive function.

During the experimental sessions, participants would be at the luteal or follicular phases excluding the period of bleeding (4-5 days) and the time immediately before planned bleeding (3 days before), because this can have a bad influence on sleep.

• Study Type: Interventional
• Enrollment (Estimated): 20
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Poland
  • Kraków, Poland, 31-571
    • University School of Physical Education in Cracow

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• a minimum of 3 years of training experience;
• practicing physical activity for the last 6 months at least 3 times per week for 2h
• current medical qualification for competitive sport

Exclusion Criteria:

• diseases that can have a bad influence on the menstrual cycle (e.g. polycystic ovarian syndrome, endometriosis);
• using hormonal contraception;
• regularity of the menstrual cycle.
• diagnosed cardiovascular, metabolic, gastrointestinal, or neurological diseases;
• movement, neuromuscular or musculoskeletal disorders;
• taking medications and supplements that may affect fitness test results;
• taking supplements that may affect biochemical test results
• sleep disorders
• PSQI >5

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Diagnostic
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
No Intervention: Normal sleep; The night before the experimental session, where participants will follow their habitual sleep-wake routines.
Experimental: Sleep restriction; The night before the experimental session (with sleep restrictions (SR)), where participants will experience acute sleep restriction the night before the test session (i.e., 3 h of early sleep restriction versus normal sleep).	Procedure: Sleep restriction; Participants will experience a night of acute sleep restriction. During this night, they will sleep 3 hours less than usual.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Maximal strength bench press test	The next day after a) sleep restriction b) normal sleep	1 day after night with or without intervention
Muscle endurance test in bench press	muscle endurance test in the bench press exercise at 50% 1RM	1 day after night with or without intervention
Explosive bench press exercise	three sets of three repetitions of explosive bench press exercise at 50% of the load representing one-repetition maximum (1RM)	1 day after night with or without intervention
Countermovement jump	Vertical jump test performed by having an athlete quickly squat to a self-selected depth and then jump as high as possible.	1 day after night with or without intervention

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Mood (POMS)	The POMS is a widely-applied measure for the assessment of an individual's mood. During each experimental session. Before sports performance protocol.	1 day after night with or without intervention
Pain (Pain scale)	A pain scale is a tool use to help assess a person's pain. Scale 0-10 (0- lack of pain; 10 - maximal pain). Immediately after the last performance exercise in experimental sessions.	1 day after night with or without intervention
Motivation	During each experimental session. Before sports performance protocol.	1 day after night with or without intervention
Rating perceived exertion (RPE)	A subjective scale that assesses the severity of effort exerted. Includes a rating from 6 perceiving "no effort" to 20 perceiving "maximum effort." Immediately after the last performance exercise in experimental sessions.	1 day after night with or without intervention
Stress and recovery (SRSS)	The Short Recovery and Stress Scale (SRSS) measure the recovery-stress state of an athlete multidimensionally with eight items on emotional, mental, physical, and overall levels. In the morning, each experimental day and the day after.	1 day after night with or without intervention
Readiness-to-train questionnaire (RTT-Q)	Subjective reactions related to the level of motivation for effort. In the morning, each experimental day and the day after.	1 day after night with or without intervention

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Objective Sleep - Total sleep time	Total sleep time obtained from sleep onset to time at wake-up assessed by actigraphy. The night before and after the experimental sessions.	1 day after night with or without intervention
Objective Sleep - Sleep efficiency	The percentage of total sleep time to lights off and leaving bed assessed by actigraphy. The night before and after the experimental sessions.	1 day after night with or without intervention.
Objective Sleep - WASO (Wake After Sleep Onset)	The total number of minutes that a person is awake after having initially fallen asleep assessed by actigraphy. The night before and after the experimental sessions.	1 day after night with or without intervention.
Objective Sleep - Sleep duration	The quantity of time that a person sleeps assessed by actigraphy. The night before and after the experimental sessions.	1 day after night with or without intervention.
Objective Sleep - Sleep onset time	The time it takes a person to fall asleep after turning the lights out assessed by actigraphy. The night before and after the experimental sessions.	1 day after night with or without intervention.
Objective Sleep - Wake time	The hours in the day that a person is awake assessed by actigraphy. The night before and after the experimental sessions.	1 day after night with or without intervention.
Blood collection - progesterone	Blood will be drawn to measure progesterone. Before each experimental sesion	1 day after night with or without intervention.
Blood collection - estradiol	Blood will be drawn to measure estradiol. Before each experimental sesion	1 day after night with or without intervention.

Collaborators and Investigators

• Sponsor: University School of Physical Education, Krakow, Poland

Study record dates

Study Major Dates

• Study Start (Actual): May 15, 2023
• Primary Completion (Estimated): August 1, 2024
• Study Completion (Estimated): August 1, 2024

Study Registration Dates

• First Submitted: November 10, 2023
• First Submitted That Met QC Criteria: January 15, 2024
• First Posted (Actual): January 25, 2024

Study Record Updates

• Last Update Posted (Actual): April 11, 2024
• Last Update Submitted That Met QC Criteria: April 10, 2024
• Last Verified: April 1, 2024

More Information

Terms related to this study

• Keywords: acute sleep restriction; early sleep restriction
• Other Study ID Numbers: 160/MN/INoS/2023

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No