The study included 8-weeks supplementation of black chokeberry extract with 18% standardization of the anthocyanins content (dose 2×200 mg per day), or a placebo product that was made from chokeberry fiber. Purpose: The aim of the study is effectiveness check of black chokeberry intake as a potential factor which, due to its ability to reduce inflammation and chelate iron ions, will have an impact on minimizing undesirable changes in the red blood cell system. Hypothesis: Main hypothesis: Supplementation of black chokeberry (Aronia melanocarpa) has a positive effect on iron economy of female swimmers. Auxiliary hypotheses: 1. Supplementation of black chokeberry enhances the antioxidant status and has a positive effect on the prooxidant-antioxidant balance. 2. Supplementation of black chokeberry reduce inflammation induced by intensive exercises, by reducing inflammatory markers. Study plan: Before first term of the study: Control of Menstrual Cycle Phases since March 2023 (installing the application on the phone - Menstrual Period Tracker calendar). First term of the study: 1. Menstrual cycle control survey. 2. Conduct a body composition analysis. 3. Collection of blood samples before the exercise test for biochemical determinations. 4. Exercise test in the swimming pool - crawl style intensive test (800 m + 200 m + 50 m). 5. Collection of blood immediately after exercise and 3 hours later. 6. Supplementation for nearly 56 days, depending on the length of the menstrual cycle. Second term of the study: Repeat the measurements from the 1st date of test. Participants: The group of selective and homogeneous female swimmers, who train swimming intensively and attend the Sports Championship School Complex.
Age range
12 Years – 19 Years
Sex
FEMALE
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Physiological parameters of blood morphology I
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of blood morphology II
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of blood morphology III
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of iron metabolism indicator I
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of iron metabolism indicator II
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of iron metabolism indicator III
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of iron metabolism indicator IV
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of iron metabolism indicator V
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of iron metabolism indicator VI
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of antioxidant-prooxidant indicator
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of immunological indicator I
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of immunological indicator II
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of immunological indicator III
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameters of immunological indicator IV
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Physiological parameter of hormonal indicator I
Timeframe: At each exercise test (up to 15 minute before exercise)
Physiological parameter of hormonal indicator II
Timeframe: At each exercise test (up to 15 minute before exercise)
Physiological parameter of hormonal indicator III
Timeframe: At each exercise test (up to 15 minute before exercise)
Physiological parameter of hormonal indicator IV
Timeframe: At each exercise test (up to 15 minute before exercise)
Other physiological parameter I
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Other physiological parameter II
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)
Other physiological parameter (with capillary blood - earlobe)
Timeframe: At each exercise test (up to 15 minute before exercise, up to 1 minute post exercise, 3 hours after)