Effect of Hot Spring Therapy on Central Fatigue Elimination During Altitude Training

Recruiting now · Not applicable

Conditions studied: Central Fatigue, Altitude Training, Cognitive Impairment, Hydrotherapy, Balneotherapy, Sports Performance

In brief

This randomized controlled trial investigates the effects of hot spring balneotherapy on central fatigue elimination in adolescent rowers undergoing altitude training at approximately 1600 meters (Tengchong, Yunnan). Thirty adolescent athletes (aged 12-16 years) will be stratified by sex and randomly allocated to three groups: Group A (natural recovery, no immersion), Group B (38°C pure water immersion), and Group C (38°C sodium bicarbonate hot spring immersion). Interventions will be administered 3 times per week for 4 weeks. The primary outcomes are central fatigue indices including voluntary activation (VA) and central activation ratio (CAR). Secondary outcomes encompass cognitive function (Stroop test, Psychomotor Vigilance Test), cerebral hemodynamics (functional near-infrared spectroscopy, transcranial Doppler ultrasound), exercise performance (maximal oxygen uptake, 1000m test, 500m test), blood lactate, and hematological parameters (white blood cells, neutrophils, platelets).

Key facts

Study ID

NCT07615478

Run by

Macao Polytechnic University

People needed

27

Starts

2026-05-25

Expected to finish

2026-06-25

Last updated by the study team

2026-05-29

Who can join

Age: 12 and older, up to 16. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Male or female aged 12-16 years- Healthy with no serious chronic diseases or skin conditions
• At least 1 year of systematic rowing training experience
• Currently undergoing centralized altitude training at approximately 1600 meters- No history of systematic hot spring or spa immersion within the past month
• No allergy history to sodium bicarbonate or hot spring minerals- Ability to provide written informed assent (participant) and written informed consent (parent/guardian)- No acute infection, fracture, or surgery within the past month
• Not currently taking non-steroidal anti-inflammatory drugs (NSAIDs), immunosuppressants, or medications affecting autonomic or cognitive function

You may not qualify if…

• History of cardiovascular, respiratory, renal, endocrine, or neurological disorders- Uncontrolled hypertension or hypotension
• History of syncope, heat intolerance, or severe dizziness during hot water immersion- Open wounds, severe eczema, or other skin conditions contraindicating water immersion
• Current use of beta-blockers, anticholinergics, stimulants, sedatives, or other medications affecting central nervous system function
• Color blindness or uncorrected visual impairment affecting Stroop test performance- Pregnancy (for female participants)- Alcohol consumption or smoking
• Shift work or trans-meridian travel within 2 weeks prior to baseline assessment
• Any condition deemed by the investigator as unsafe for participation

Where it is running

• Macao Polytechnic University — Macao, Macao, China (enrolling)

Full record on ClinicalTrials.gov

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