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Clinical Trials in Poland / NCT07641075
Recruiting Not applicable

Effects of High-Dose Vitamin D on Hormones, Neuromuscular Function, Cognition, and Body Composition in Athletes

NCT07641075 · tracked via the Priya Life Science Poland tracker
Sponsor
The Jerzy Kukuczka Academy of Physical Education in Katowice
Phase
Not applicable
Started
2025-07-01
Last updated
2026-06-11

Condition(s) studied

Vitamin D 25-Hydroxylase DeficiencyVitamin D Deficiency/Insufficiency

Investigational drug(s) / intervention(s)

Vitamin D supplementationPlacebo

Vitamin D supplementation: Vitamin D3 will be administered orally in the form of capsules. Participants will ingest a total daily dose of 4,000 IU, split into two doses: 1 capsule (4,000 IU) in the evening with dinner. The intervention will be carried out daily for a duration of either 4 or 8 weeks. Supplementation compliance will be monitored by the research team through capsule counting during follow-up visits.

Placebo: An identical placebo will be administered orally in the form of capsule, matching the active vitamin D3 supplement in appearance, size, color, and taste. Participants will ingest 1 placebo capsule in the evening with dinner daily for a duration of either 4 or 8 weeks.

Study 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

Sex
ALL
Min age
17 Years
Max age
60 Years
Healthy volunteers
Accepted
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.

Primary outcome measure(s)

  • Serum 25-Hydroxyvitamin D Concentration — 8-weeks
    Description: Serum concentration of 25-hydroxyvitamin D \[25(OH)D\] measured using a validated laboratory method to assess vitamin D status. Unit of Measure: ng/mL

Trial sites (1)

FacilityCityRegionStatus
The Jerzy Kukuczka Academy of Physical Education in Katowice Katowice Mikołowska 72a Recruiting

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Official registry record

This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.

View NCT07641075 on ClinicalTrials.gov ↗ ← All trials in Poland