An observational study in Healthy, sponsored by Poznan University of Physical Education. Completed at 1 site in Poland. Open to male participants aged 18 Years to 25 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-09-18.
Sponsored by Poznan University of Physical Education · Observational
The goal of this observational study is to learn how motivation and body chemistry are linked during and after intense exercise in national-level rowers.
The main questions this study aims to answer are:
Do athletes with higher motivation show different changes in brain chemicals after exercise? How do hormone and neurotransmitter levels change during recovery after exercise?
Participants will:
Complete a motivation questionnaire called the Inventory of Achievement Motivation (LMI) before the exercise test.
Perform a 6000-meter rowing test on an indoor rowing machine. Have blood samples taken three times: before exercise, immediately after exercise, and 1 hour after exercise.
Researchers will measure blood levels of testosterone, cortisol, serotonin, dopamine, beta-endorphin, anandamide (AEA), and 2-arachidonoylglycerol (2-AG).
This study will help researchers understand how motivation and body chemistry work together to influence performance and recovery in highly trained athletes.
This study explores how motivation and body chemistry are connected during and after intense physical exercise in national-level rowers. Researchers want to understand how psychological factors, such as motivation to achieve goals, relate to changes in hormones and brain chemicals that occur with exercise and recovery.
Before the exercise test, participants will complete a motivation questionnaire called the Inventory of Achievement Motivation (LMI). This questionnaire helps identify how strongly a person is driven to perform, overcome challenges, and reach success.
After the questionnaire, each participant will complete a 6000-meter rowing test on an indoor rowing machine. This test is designed to produce a high level of physical effort similar to competition conditions. Blood samples will be taken three times: before the test, immediately after the test, and one hour after recovery.
The blood samples will be used to measure levels of several hormones and neurotransmitters, including testosterone, cortisol, serotonin, dopamine, beta-endorphin, anandamide (AEA), and 2-arachidonoylglycerol (2-AG). These substances are involved in stress response, motivation, reward, and recovery.
Researchers will compare the results from the motivation questionnaire with changes in hormone and neurotransmitter levels. The goal is to find out whether more motivated athletes show different chemical responses to exercise and recovery.
Findings from this study may improve understanding of how the mind and body interact during intense training. This knowledge could help athletes and coaches develop better ways to support motivation, performance, and recovery in high-level sports.
1,860 studies on the registry are indexed under Fatigue; 376 are open to participants now.
This study's enrollment of 24 is below the median of 100 across 367 observational studies indexed under Fatigue.
Browse Fatigue studies →Poznan University of Physical Education is the lead sponsor of 90 studies on the registry; 27 are open to participants now.
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All participants were recruited and tested at the Central Sports Centre - Olympic Preparation Center (COS OPO) in Wałcz, Poland, during a national team training camp under standardized conditions.
National-level male rowers Age between 18 and 25 years Minimum of 3 years of systematic rowing training Regular training load (at least 10 sessions per week during the competitive season) Good general health and medical clearance for maximal exercise testing
Exclusion Criteria:
Current illness, injury, or infection Use of medications or dietary supplements that could affect hormone or neurotransmitter levels Smoking or use of psychoactive substances Inadequate sleep or food intake before testing Refusal or inability to provide informed consent
The study includes 24 national-level male rowers. All participants are healthy, highly trained athletes with at least 3 years of systematic rowing experience and regular intensive training.
Other: 6000-meter rowing ergometer test
Participants perform a 6000-meter rowing test on an indoor ergometer at maximal effort to simulate race conditions and induce physiological fatigue.
Changes in serum Cortisol levels
Measurement of Cortisol serum concentrations (ng/mL).
Time frame: Before exercise, immediately after, and 1 hour after recovery
Changes in serum Testosterone levels
Measurement of Testosterone serum concentrations (ng/mL).
Time frame: Before exercise, immediately after, and 1 hour after recovery
Changes in serum Dopamin levels
Measurement of Dopamin serum concentrations (ng/mL).
Time frame: Before exercise, immediately after, and 1 hour after recovery
Changes in serum Serotonin levels
Measurement of Serotonin serum concentrations (ng/mL).
Time frame: Before exercise, immediately after, and 1 hour after recovery
Changes in serum Beta-endorphin levels
Measurement of Beta-endorphin serum concentrations (ng/mL).
Time frame: Before exercise, immediately after, and 1 hour after recovery
Changes in serum anandamide (AEA) levels
Measurement of anandamide (AEA) serum concentrations (ng/mL).
Time frame: Before exercise, immediately after, and 1 hour after recovery
Changes in serum 2-arachidonoylglycerol (2-AG)) levels
Measurement of 2-arachidonoylglycerol (2-AG) serum concentrations (ng/mL).
Time frame: Before exercise, immediately after, and 1 hour after recovery
Changes in Testosterone-to-cortisol ratio (T:C)
Ratio calculated from serum testosterone and cortisol concentrations (ng/mL), used as an indicator of anabolic-catabolic balance.
Time frame: Before exercise, immediately after, and 1 hour after recovery
Changes in TSerotonin-to-dopamine ratio (S:D)
Ratio of serum serotonin to dopamine concentrations (ng/mL), reflecting neurochemical balance related to motivation and fatigue.
Time frame: Before exercise, immediately after, and 1 hour after recovery
Achievement Motivation (LMI score)
Assessment of achievement motivation using the Inventory of Achievement Motivation (LMI). The questionnaire evaluates multiple dimensions of motivation, such as persistence, confidence in success, goal setting, and compensatory effort. Total and subscale scores are analyzed to identify individual motivational profiles.
Time frame: Before exercise (baseline)
Plan to share: No — Individual participant data (IPD) will not be shared. Data will be used only for internal analysis and dissemination in scientific publications in aggregate form, in accordance with ethical approval.
No publications or documents are linked to this record.
This study is completed, as verified in Nov 2025. You cannot join it, but the record below documents what was studied.
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Poznan University of Physical Education