NCT07641075 Effects of High-Dose Vitamin D on Hormones, Neuromuscular Function, Cognition, and Body Composition in Athletes
| NCT ID | NCT07641075 |
| Status | Recruiting |
| Phase | — |
| Sponsor | The Jerzy Kukuczka Academy of Physical Education in Katowice |
| Condition | Vitamin D 25-Hydroxylase Deficiency |
| Study Type | INTERVENTIONAL |
| Enrollment | 200 participants |
| Start Date | 2025-07-01 |
| Primary Completion | 2025-07-10 |
Eligibility & Interventions
Eligibility Fast-Check
Enter your details for a quick preliminary check. This does not replace medical advice.
What to Expect as a Participant
You will actively receive the study intervention — which may be a drug, biologic, device, or procedure.
This trial targets 200 participants in total. It began in 2025-07-01 with a primary completion date of 2025-07-10.
⚠ This information is for research awareness only. Always consult your physician before joining any clinical trial. Participation is voluntary and you may withdraw at any time.
Brief Summary
This study aims to evaluate the effects of high-dose vitamin D3 supplementation on selected physiological, neuromuscular, and cognitive parameters in athletes. At the baseline visit, participants will undergo a series of assessments at the Functional Research Laboratory at AWF Katowice, including a 10 mL venous blood sample collection, body composition analysis (via InBody and DEXA scans), neuromuscular function evaluation using tensiomyography (TMG), and computerized cognitive tests via the Vienna Test System. Following baseline testing, participants will be randomly assigned to either the vitamin D3 group or the placebo group. The active group will receive a daily dose of 4,000 IU of vitamin D3 (1 capsule with dinner), while the control group will receive an identical placebo. The intervention period will last for 4 or 8 weeks. Upon completion of the supplementation period, all baseline assessments will be repeated to evaluate the post-intervention changes.
Eligibility Criteria
Inclusion Criteria: * a minimum of 8 years of training experience, * absence of injuries in the 6 months leading up to the assessments, * consistent engagement in training sessions a minimum of 5 times per week over the last 6 months. Exclusion Criteria: * vitamin D supplementation within one month prior to the study, * use of multivitamin supplements, * intestinal disorders.
Contact & Investigator
Frequently Asked Questions
Who can join the NCT07641075 clinical trial?
This trial is open to participants of all sexes, aged 17 Years or older, up to 60 Years, studying Vitamin D 25-Hydroxylase Deficiency. Full inclusion and exclusion criteria are listed in the Eligibility Criteria section. Always confirm your eligibility with the research team before applying.
Is NCT07641075 currently recruiting?
Yes, NCT07641075 is actively recruiting participants. Contact the research team at m.michalczyk@awf.katowice.pl for enrollment information.
Where is the NCT07641075 trial being conducted?
This trial is being conducted at Katowice, Poland.
Who is sponsoring the NCT07641075 clinical trial?
NCT07641075 is sponsored by The Jerzy Kukuczka Academy of Physical Education in Katowice. The trial plans to enroll 200 participants.