Salt and trace element balance during exercise in hot and humid environments.

Estimation of changes in the excretion of salt and trace elements during sweating and the presence of heat acclimation in exercise under hot and humid conditions

Status

Recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-jRCT1020230023

Enrollment

Registered

2023-09-12

Start date

2023-09-10

Completion date

Unknown

Last updated

2025-07-18

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Heat related illness heat related ollness

Interventions

At the Hyalchi Kichijoji Studio's Yoga & Stretch Room, exercise is conducted by maintaining a constant temperature and humidity (temperature: 30-35 degrees Celsius, humidity: 25-35%). This exercise in

D015444

exercise load tests

Eligibility

Sex/Gender

Male

Inclusion criteria

Inclusion criteria: 1. Individuals who are 20 years of age or older but not older than 40 years at the time of obtaining consent. 2. Healthy males. 3. Those who have provided consent to participate in this research study.

Exclusion criteria

Exclusion criteria: Individuals currently receiving outpatient treatment for diabetes, hypertension, heart disease, or renal insufficiency, individuals receiving outpatient care for psychiatric disorders, and individuals whose recent health examination results, confirmed with their consent, show blood pressure or blood glucose levels exceeding the reference range. Additionally, individuals who have been advised by a physician to refrain from exercisin

Design outcomes

Primary

Measure	Time frame
The primary evaluation parameter is the concentration of mineral components in sweat. The mineral components analyzed include sodium (Na), potassium (K), magnesium (Mg), calcium (Ca), zinc (Zn), copper (Cu), chromium (Cr), bromine (Br), and strontium (Sr). The composition and quantity of electrolyte loss from the entire body are estimated based on changes in body weight and fluid intake.	—

Secondary

Measure	Time frame
Secondary evaluation parameters include urine samples collected before exercise, heart rate during exercise, and temperature measurements taken during breaks. Using the BDHQ (Brief Diet History Questionnaire), the estimated intake of trace elements from regular dietary habits is assessed. The previous day's salt intake is measured from the urine samples collected before exercise. Analysis is conducted to explore the relationship between heart rate during exercise, changes in body temperature, and the components of sweat. Additionally, analyses are performed to examine the relationship between regular dietary intake patterns and the composition of sweat, as well as the relationship with fluid intake.	—

Measure

Time frame

Secondary evaluation parameters include urine samples collected before exercise, heart rate during exercise, and temperature measurements taken during breaks. Using the BDHQ (Brief Diet History Questionnaire), the estimated intake of trace elements from regular dietary habits is assessed. The previous day's salt intake is measured from the urine samples collected before exercise. Analysis is conducted to explore the relationship between heart rate during exercise, changes in body temperature, and the components of sweat. Additionally, analyses are performed to examine the relationship between regular dietary intake patterns and the composition of sweat, as well as the relationship with fluid intake.

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Contacts

Public ContactTakeyasu KAKAMU

Fukushima Medical University

bamboo@fmu.ac.jp+81-245471175

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Feb 4, 2026