Clinical Research Directory
Browse clinical research sites, groups, and studies.
Effects of High-Dose Vitamin D on Hormones, Neuromuscular Function, Cognition, and Body Composition in Athletes
Sponsor: The Jerzy Kukuczka Academy of Physical Education in Katowice
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.
Official title: The Effect of High-dose Vitamin D Supplementation on Selected Hormone Concentrations, Neuromuscular Transmission, Athletic Performance, Cognitive Functions, and Body Composition in Athletes.
Key Details
Gender
All
Age Range
17 Years - 60 Years
Study Type
INTERVENTIONAL
Enrollment
200
Start Date
2025-07-01
Completion Date
2028-12-31
Last Updated
2026-06-11
Healthy Volunteers
Yes
Interventions
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.
Locations (1)
The Jerzy Kukuczka Academy of Physical Education in Katowice
Katowice, Mikołowska 72a, Poland