Sleep, Sleep Restriction
Conditions
Keywords
acute sleep restriction, early sleep restriction
Brief summary
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.
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.
Interventions
PROCEDURESleep restriction
Participants will experience a night of acute sleep restriction. During this night, they will sleep 3 hours less than usual.
Sponsors
University School of Physical Education, Krakow, Poland
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
DIAGNOSTIC
Masking
SINGLE (Caregiver)
Eligibility
Sex/Gender
FEMALE
Age
18 Years to 30 Years
Healthy volunteers
Yes
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Maximal strength bench press test | 1 day after night with or without intervention | The next day after a) sleep restriction b) normal sleep |
| Countermovement jump | 1 day after night with or without intervention | Vertical jump test performed by having an athlete quickly squat to a self-selected depth and then jump as high as possible. |
| Explosive bench press exercise | 1 day after night with or without intervention | three sets of three repetitions of explosive bench press exercise at 50% of the load representing one-repetition maximum (1RM) |
| Muscle endurance test in bench press | 1 day after night with or without intervention | muscle endurance test in the bench press exercise at 50% 1RM |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Pain (Pain scale) | 1 day after night with or without intervention | 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. |
| Mood (POMS) | 1 day after night with or without intervention | The POMS is a widely-applied measure for the assessment of an individual's mood. During each experimental session. Before sports performance protocol. |
| Motivation | 1 day after night with or without intervention | During each experimental session. Before sports performance protocol. |
| Rating perceived exertion (RPE) | 1 day after night with or without intervention | 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. |
| Stress and recovery (SRSS) | 1 day after night with or without intervention | 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. |
| Readiness-to-train questionnaire (RTT-Q) | 1 day after night with or without intervention | Subjective reactions related to the level of motivation for effort. In the morning, each experimental day and the day after. |
Other
| Measure | Time frame | Description |
|---|---|---|
| Objective Sleep - Sleep onset time | 1 day after night with or without intervention. | 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. |
| Objective Sleep - Sleep duration | 1 day after night with or without intervention. | The quantity of time that a person sleeps assessed by actigraphy. The night before and after the experimental sessions. |
| Objective Sleep - WASO (Wake After Sleep Onset) | 1 day after night with or without intervention. | 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. |
| Objective Sleep - Wake time | 1 day after night with or without intervention. | The hours in the day that a person is awake assessed by actigraphy. The night before and after the experimental sessions. |
| Blood collection - progesterone | 1 day after night with or without intervention. | Blood will be drawn to measure progesterone. Before each experimental sesion |
| Blood collection - estradiol | 1 day after night with or without intervention. | Blood will be drawn to measure estradiol. Before each experimental sesion |
| Objective Sleep - Sleep efficiency | 1 day after night with or without intervention. | The percentage of total sleep time to lights off and leaving bed assessed by actigraphy. The night before and after the experimental sessions. |
| Objective Sleep - Total sleep time | 1 day after night with or without intervention | Total sleep time obtained from sleep onset to time at wake-up assessed by actigraphy. The night before and after the experimental sessions. |
Countries
Poland
Outcome results
None listed