The goal of this clinical trial is to evaluate if molecular hydrogen can reduce the metabolic response during graded exercise in healthy women aged 18-30 years. The main questions it aims to answer are:
* Does molecular hydrogen reduce the respiratory exchange ratio? * Does molecular hydrogen reduce oxygen uptake?
Researchers will compare molecular hydrogen to a placebo (ambient air containing no molecular hydrogen) to see if molecular hydrogen reduces the metabolic response.
Participants will:
* Inhale molecular hydrogen for 60 minutes each day for 7 days. * Undergo an exercise testing twice after a two-week washout period.
Healthy female participants.
Regular menstrual cycle with exercise testing scheduled outside the menstrual phase.
Signed informed consent.
Pregnancy or breastfeeding.
History or presence of cardiovascular disease.
History or presence of respiratory disease.
Regular use of medications affecting metabolism.